Troubleshooting if a Thermostat is BAD: Explained!

Подписаться 504 тыс.

Просмотров 1,1 млн

50% 1

This is for testing if a 24-volt thermostat is bad. These are the steps you should take in order to verify that it is the thermostat that is bad and not the wiring or control board. When you make sure that the power is on to the unit, the light (if there is one) is lit inside the HVAC system and nothing happens when you turn the thermostat on then this video is for you. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Our Related Videos/Articles
• Top 12 Problems/Mistak... 10
• Thermostat Wiring Diag...
• Thermostat Wiring to a...
• Thermostat Wiring & Re...
• Thermostat, Furnace, A...
• Thermostat Wiring & Re...
• Heat Pump Thermostat W...
• Wiring a Thermostat, F...
• How to Test a Heat Pum...
• Wiring a Heat Pump The...
• Heat Pump Thermostat T...
• Understanding and Wiri...
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Our HVACR Educational Books, E-Books, Workbooks, Cards, Posters, and PowerPoints:
All Our Educational Products on Our Site: www.acservicetech.com/store
All Our Educational Products on Amazon: amzn.to/48pDd82
Mini Split Book and E-Book on Our Site- www.acservicetech.com/mini-sp...
Mini Split Paperback on Amazon- amzn.to/3ytHJSs
Mini Split Paperback on TruTech Tools- www.trutechtools.com/BooksGui...
Refrigerant Charging Book and E-Book: www.acservicetech.com/ac-book
Refrigerant Charging Paperback on Amazon: amzn.to/46xTeHf
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Our HVACR Online Resources!
Our HVAC Calculators: www.acservicetech.com/hvac-ca...
Our Newest Articles: www.acservicetech.com/articles
Try our HVAC/R Quizzes! www.acservicetech.com/quizzes
Our Other Resources: www.acservicetech.com/resources
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Tools Used in Our Videos!
Tool Links on Our Site: www.acservicetech.com/tools
Our Tool List on Amazon: www.amazon.com/shop/acservice...
Support the Channel by purchasing tools through TruTech Tools!
Use this link www.trutechtools.com/?aff=8
Save 8% at checkout using code "acservicetech"
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Follow Us On Our Social Media & Podcasting Channels!
Patreon: / acservicetech
Facebook: / acservicetech
Instagram: / acservicetech
X: / acservicetech
LinkedIn: / ac-service-tech-llc
Tiktok: / acservicetech
Spotify: open.spotify.com/show/74KXLz5...
Apple Podcasts: podcasts.apple.com/us/podcast...
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
⚠️ Disclaimer:
Information in this video is intended for educational purposes only. Any work related to the topics in this video should be performed by licensed technicians or by apprentices under the supervision of licensed technicians. AC Service Tech LLC is not responsible for any possible damages or injuries caused by the use or misuse of any information provided. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
#hvacr #hvacr #hvactrainingvideos #hvactraining #hvactraining101 #acservice #acservicetech #oil #thermostat #problem #top10 #hvacthermostat #hvactips #hvacproblems #thermostats
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Shop through Amazon! Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal.

Опубликовано:

31 мар 2016

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 370

@acservicetechchannel 7 лет назад

Our Inverter Mini Split Resources: Mini Split Book on Our Website- www.acservicetech.com/mini-split-book Mini Split Paperback on Amazon- amzn.to/3ytHJSs Mini Split Paperback on TruTech Tools- www.trutechtools.com/BooksGuides?aff=8 Mini Split E-Book on Google- play.google.com/store/books/details?id=HN-iEAAAQBAJ Mini Split E-Book on Apple- books.apple.com/us/book/id6445178399 Our Single Speed and Two Speed Air Conditioning Resources: My Paperback and E-Book: www.acservicetech.com/the-book My Paperback: www.amazon.com/shop/acservicetech Read the book reviews on Amazon! Check out our new Articles at www.acservicetech.com/articles Support the Channel by purchasing tools through Tru Tech Tools! Use this link www.trutechtools.com/?Aff=8 Save 8% at checkout using code "acservicetech" My Service and Procedure Book- www.acservicetech.com/the-book Tool List- www.amazon.com/shop/acservicetech Support- www.patreon.com/acservicetech For those that are looking for the tools used in the videos: (Linked Below) UEI DL479 Multimeter with temp sensor amzn.to/2jtsUbJ Magnet Jumpers- amzn.to/2PyKPQZ Alligator Jumpers- amzn.to/2PxqJXn Fieldpiece ST4 Dual Temp Meter amzn.to/2wc1ME3 Fieldpiece Bead K Type Temp Sensor amzn.to/2DBwKfs Fieldpiece Wet Bulb Temp Sensor amzn.to/2RRI7Tw Fieldpiece TC24 Temp Clamp amzn.to/2qHLyjZ Yellow Jacket Refrigerant Gauge Set amzn.to/2aenwTq Refrigerant hoses with valves amzn.to/2aBumVI Yellow Jacket Gauge set & hoses amzn.to/2vLVkV9 Yellow Jacket 4 Port Manifold w Hoses amzn.to/2BkuGIq FieldpieceSMAN360 Digital Manifold Set amzn.to/2BdoaD4 FieldpieceSMAN460 Digital Manifold Set amzn.to/2nB4Fe6 Compact Ball Valve for Refrigerant Hose amzn.to/2KUisW8 QuickDisconnect 90 for refrigerant hose amzn.to/2MMtVcg JB 6 CFM Vacuum Pump amzn.to/2nqbvo8 Appion Blue 3/8" to 1/4" Vacuum Hose amzn.to/2uYlVyc Appion Red 3/8" to 1/4" Vacuum Hose amzn.to/2uYg6Ro Appion Valve Core Removal Tool amzn.to/2uYr8WL Yellow Jacket 1/4" by 1/4" hose amzn.to/2umtcod CPS Vacuum Micron Gauge amzn.to/2v1nM3O Supco Vacuum Micron Gauge amzn.to/2v1JRiA RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn UEI DL389 Multimeter amzn.to/2xAdaJf Air Acetylene Torch setup amzn.to/2aQalsb 15% Silver Brazing Rods amzn.to/2gVLyLc Nitrogen Regulator amzn.to/2bXdR5f Nitrogen Flow Meter amzn.to/2brvoBg Other tool links can be found in the video description section. Shop through Amazon! Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal- www.amazon.com/shop/acservicetech

@inquisitvem6723 7 лет назад

so before i do anything, i should shut off power to house right? so i dont get electrocuted? then open the panel display? I have a honeywell CT500 that goes blank every so often and now not generating cold air...i have a brand new AC unit too. it has no batteries, so that cant be the problem. i also reset the circuit breakers and the display panel of thermostat still goes blank and then re-appears. it does this every few minutes or so. is it a problem with the wire connection of thermostat? is it loose?

@acservicetechchannel 7 лет назад

I recommend calling a tech but they would shut the power to the hvac system off and take the tstat face plate off and tighten the connections on both ends, in the thermostat and in the furnace or air handler. After that they will check for 24v to the thermostat and if they have it then it is a bad thermostat. It could also be one of the pins not aligning on the back of the thermostat.

@inquisitvem6723 6 лет назад

did u power off the thermostat? i see nothing on the panel at the beginning of vid.

@darrylchappell3440 6 лет назад

How to replace thermostat for boiler heater

@darrylchappell3440 6 лет назад

How to replace thermostat for boiler heater

@terencechan7338 4 года назад

Thank you for saving me a costly service visit! Your suggestion of tapping the R and G wires helped me confirm a bad thermostat! Thank you for taking the time to produce easy to follow instructional videos with detailed explanations that don’t require hvac training to understand!

@acservicetechchannel 4 года назад

Glad it helped!

@sandrarichardson2713 2 года назад

Hi---It looks like you understood what he said about the red and green wire. Did he say the thermostat is bad if the fan DOES come on when touching the red and green wires together or if the fan DOESN'T come on? Thanks for your help. Jesus bless.

@terencechan7338 2 года назад

@@sandrarichardson2713 Hi! He said if the fan turns on when you jump the R and G, then the faceplate/thermostat is bad. Good luck!

@vetdadcubby4722 8 лет назад

Awesome, I just completed tech school last fall and I'm working for an HVAC contractor! ALWAYS learning!

@acservicetechchannel 8 лет назад

Great to Hear and in this trade, we all will always be learning! Keep it up because over time you will move up the ladder right past those that stop searching for answers and learning new things! Thanks

@frustratedmechanic6263 7 лет назад

The best instructor on RU-vid... he makes it so easy to understand.

@acservicetechchannel 7 лет назад

Thank you very much Dwayne Wallace! I am glad you appreciate the video!

@cozmicmojo2181 4 года назад

For anyone who's control panel is working and whose unit is fine but doesn't seem to be sending data: If continuity from the screws to the copper is good, look at the AC unit's circuit board and check the fuse(should be purple or amber). I accidentally blew it somehow when moving the thermostat. Easy fix!

@aureannanicole3477 Год назад

Thanks! You saved me so much time. Couldn’t figure out what my problem was!

@willlove7927 6 лет назад

Thank you I’ve literally watched atleast 2 videos every day and I’ve become a better tech because of you thanks a lot I have to get better at gas furnaces and diagnosing electrical issues

@acservicetechchannel 6 лет назад

That is awesome to hear Will! Thanks for letting me know!

@st.charlesstreet9876 Год назад

The explanation and demonstration is so very clear and Very much appreciated, Thank You!

@davidfc1985 3 года назад

I just solved my problem with my 1950"s Lennox Furnace with this video. Thank you for all the great videos!

@debotoed 6 лет назад

Hi and thank you for your videos. I have tried extensively to troubleshoot my thermostat issues but to no avail. The electric furnace works, in so far that if I switch it off from heat to off. If I don't it will just continuously run. I am beginning to wonder if it is a wire issue between thermostat and furnace, as I have replaced the thermostat 4 times in past 5 years. (with same thermostat rth 221). However this year it is not responding to program or hold function. I have five wires coming out (red, white, green, black, and orange.) I don't have pump so orange not in use. I am not sure if relevant but the program and hold feature do work if I remove black wire, but there is no heat when operating with this configuration. Thanks

@jerrodwilliams6789 5 лет назад

also If the reversing valve solenoid was beginning to short out would it fry the defrost board or the thermostat? its a lennox 13hpx-030-13

@DaBuick 4 года назад

I’m having intermittent thermostat issues. Going to replace it tomorrow am when the store opens. I appreciate the video, it confirmed what I had done.

@acservicetechchannel 4 года назад

Thanks for letting me know!

@tilnoenecp704 2 года назад

*Easy to assemble **Fastly.Cool*

@Volusiaev 3 года назад

If you need heat in an emergency, would you have to connect the three wires (r g w) altogether? Or will just jumping the r & w work?

@jochute 6 лет назад

Thank you so much for a concise clear video on troubleshooting.

@acservicetechchannel 6 лет назад

Thanks Josh!

@robertomurri1278 5 лет назад

I have a question if you don't mind answering it. I have a Honeywell thermostat, and it would blink like the thermostat was about to turn off completely. So I switched the coin cell battery and when I put the front plate back on to the back part mounted on the wall. I waited for it turn back on, and I put the cool air to auto and on 65. The fan never came on tho, and even when I bring it down to the lowest temp. It would still say "Cool On", but nothing. What could it be? Should I do what you did in the video? I did turn the breaker switch to Off, and then back On and it worked for a min then it shut off. Smh.

@williamowen9528 Год назад

This video was a BIG help! Thanks for posting it!

@HsingSun 2 года назад

Thank you very much for your video. My system was keeping running when both inside and setting temperatures are matched, what is caused the problem inside the air-handler, need help?

@robertnieves5848 7 лет назад

Thank you, I was able to fix my AC problems using this video, thanks for taking the time

@acservicetechchannel 7 лет назад

Awesome to hear, thanks!

@joshr9358 5 лет назад

Great video! It is to the point and easy to understand. Thanks!

@acservicetechchannel 5 лет назад

Thanks Josh!

@mindofmayhem. 5 лет назад

My heat- off-cool button is stuck. It will go the left towards cool, center, but won't go to the right (heat) when pushed. Any ideas? Mine is the opposite way from the one in the video.

@MrRasgabriel 8 месяцев назад

Thank you so much for helping me bring heat back to my home for my family!

@binjagav2053 Год назад

My man!!!!!!!! After I changed almost everything in the furnace, not works until I did the test G and R and the thermostat was bad . Now my furnace work like 7/11 store non stop. Thank you so much bro

@melvin292 7 лет назад

Great video and a good explanation of why the industry moved away from the old mercury switch. Those switches would bounce those compressors on and off until the mercury settled. A five minute delay is a bit long but better safe than sorry.

@acservicetechchannel 7 лет назад

Yes if I need to turn it on quickly then I use the mag jumpers, otherwise I have time while doing other maintenance, Thanks

@TheJesse7647 Год назад

Do you have anything that shows what wires should be connected at the furnace from the thermostat to the fan motor ?

@thatguyinthathat.s6969 4 года назад

I just have a red and white wire. I only have heat so that should explain it, right? My panel “works” meaning it can be set etc, however it has no impact on the furnace. If the heat is on it keeps staying on... and temp keeps rising. Any suggestions?

@girohead 3 года назад

Excellent tutorial. I asked a guy years ago how he knew the tstat was failed, he said, 'I jumped it' and I assumed but didn't know that meant (esp with multiple wires, and why). It makes sense if something is simply not turning on. If it starts/stops w/o hitting temp, I assume that is on furnace side?

@ebiedog 4 года назад

My ac wasn't blowing cold so I had a tech recharge the refrigerant. It helped but now, a week later, whenever I switch the thermostat from ON to Auto, the fan doesn't blow. Any suggestions?

@sethjones4916 5 лет назад

The free heat I get from my apt. complex isn't enough for me sometimes, and I'll put some ice around the thermostat. This trick used to work big time, but now it doesn't work at all. Have complexes gotten wise to this trick, and devised a way to prevent a sudden drop in temperature from being taken seriously? The thermostat will say the heat is on when I do this, but the baseboard heaters stay cold. But if I remove the ice, and the temperature returns to normal, the heaters will come on naturally from a natural drop in temperature. Does anyone have any thoughts on this, and what I can do to fix it?

@acservicedaytona386portora3 7 лет назад

Again another great video...

@acservicetechchannel 7 лет назад

Thanks Robert!

@titanicsauce2152 4 года назад

I learned alot. Thank-you!

@mikellandrum6673 Год назад

Any idea what would cause the blower motor to blow harder once I removed the jumper wire to diagnose the thermostat. My blower kept blowing for about 20 seconds after I pulled the jumper wire and it blew harder than it did when thermostat was working

@xavahh 4 года назад

I helped the fan by spinning it manually. It slowly turns on. Air is still humid. Not blowing cool. I turn the furnace off, but the fan still sounds like its on and it doesn't spin. Would this be a thermostat problem?

@stephfong4577 3 года назад

A service guy came and told me the first stage heat pump does not work because he could not feel the heat when touching the tube. Do you have a video to check which heat pump has problems in the two-stage electric AC+furnace system?

@darinz182 4 года назад

Thank you for sharing your knowledge brother ! You’re a great Teacher and Tech!

@acservicetechchannel 4 года назад

Thanks a lot Darin!

@lexus3577 2 года назад

When you say fan, are you referring to air handler fan or compressor fan? My AC is not getting 24V at contactor to turn on compressor and compressor fan but air handler fan is working. I'm getting 24V b/w R and Y, R and G, R and W on thermostat. When thermostat calls for cool, G and Y goes from open to shorted (connected). So the thermostat is working fine, correct?

@nld-bl5ct 2 года назад

My Lennox Air Handler CBA 27 fan will not come on on circulationg "ON' setting since it was installed 3 years ago. Just running AC from my attic. Would like to circulate the fan all the time. I have even changed out the thermostat. Any thoughts?

@geojor 5 лет назад

very practical video, thank you ...

@acservicetechchannel 5 лет назад

Thanks Pei Broker!

@leo33125 Год назад

i enter youtube to look for thermostat problems, cause i got a service call for tomorrow, boom this video give me all i needed. ty

@yuyuyu9029 Месяц назад

Looking at this video while doing a service call lmaooo

@denniszehner1380 3 года назад

I just put in a new condensate pump. Pretty simple. Turn off the power, unplug the old little giant and remove. Install new little giant, plug in and power up. Problem is that after doing this I have no power to the thermostat. I jumped the fan but it doesn't run. It's a tempstar and I don't believe there is any reset switch. I have checked fuses and breakers and all are good. I filled the reservoir and the pump works. The pan is not switched for water. The fan just hums. I checked the capacitor and it shows 7.3. Any idea where to look next?

@miketreat 7 лет назад

Great video. Thanks for the help

@acservicetechchannel 7 лет назад

Thanks Mike!

@andrewskerbitz1358 5 лет назад

Thank you! Info helped diagnose the thermostat.

@acservicetechchannel 5 лет назад

Glad to help Andrew!

@dubbya57 4 года назад

The only way to get my heater to kick on is to change the fan selector from AUTO to ON. Then when the desired temp is reached I change it back. But then it wont kick on again when the temp drops. Should I just replace the thermostat?

@ricardosotobarraza3715 3 года назад

I’m reading 24 volts between R&Y , R&W , but only 12 volts between R&G. Could it be a transformer issue? Or a short on the G ?

@s.e.d6021 5 лет назад

my thermostat has steadily been dropping it now says 50 degrees and ive set it on 71.. needless to say its stuffy..i changed the batteries and it went up to 51...somebody able to advise me at ALL?

@xhacu9625 2 года назад

For some reason. On my Goodman single stage furnace. I jump r with the A/C and it works. But my heat and fan don’t. Any reasons on why?

@cassondrad2280 5 лет назад

Awesome. Girl Power. You helped me figure it out. I GOT HEAT. I so refused to call service man. I knew if air conditioner worked and I tested just like you showed to boot the fan, then I knew it wasn't the furnace. I have where red wire could go either to RC or RH, it was at RC so I hooked red to RH and I got heat. Thank you

@GomezTavo 5 лет назад

I have RC and RH. How did you test the thermostat?

@AK99581 5 лет назад

Even though you now have heat, that's not really the proper way to do that. You shouldn't have to constantly switch your live wire over every time you want to switch between heating and cooling. If you only have one red wire coming in from furnace control board, it should be hooked into the RH terminal, while a separate jumper wire should be connected between RH and RC.

@jasonharris120 9 месяцев назад

This helped me out tremendously! Thanks alot

@sagrero272 4 года назад

Hi I have problem whith my termostat, it turn on no automatic just on and when I change the automatic it works. But when comes to the right temperature inside doesn't turn off, and when turn off try to turn on again but sounds only a click on it and dosnt start. Can you help me please ?🙏

@madurasenju2015 5 лет назад

I been seeing your videos for 2 years before I became a tech , and even now I always see them and learn dude . Ur a great teacher , I can only image how your helpers or family members who are intrested in the trade turns out to be man . Thanks and please always keep uploading more videos .

@acservicetechchannel 5 лет назад

Thank you very much Gabriel!

@Dave-um1hl 2 месяца назад

Hi. The screen on my thermostat is blank. I replaced batteries, nothing. A couple days was back on. Now blank again…but, if I press the temperature up, it comes on (not the screen, the furnace). Also, if I turn fan on it comes on. Any ideas 💡. Thanks so much.

@allenbrown7791 5 лет назад

I have a hunter programmable an I was wanting to know what the switches on the back of the panel are it says non/hphp sw3 witch one should it be on I have gas

@acservicetechchannel 5 лет назад

It would be non heat pump if you just have an ac with gas furnace, thanks

@mickettstackhousestudio8705 6 лет назад

thanks for the video. My thermostat (Honeywell RTH2300B1102) is blank and controls do not work at all. BUT AC is still running and it is very cold in here. I can not stop the AC by switching thermostat to OFF. AC did stop when I took off thermostat cover. Do I need a new thermostat?

@acservicetechchannel 6 лет назад

Yes it sounds like you do, thanks

@Lemurian.Quartz Год назад

Is there a follow up video of what to do if this doesn’t work?.. I recently got a new condo.. I installed a “smart thermostat” by EcoBee. It worked fine for a few months but then suddenly stopped. I’ve flipped all breakers, I tried the things in this video.. what is weird is that since it is smart, it will send me notifications when it turns on about the temperature. I will be at work, and out of nowhere (nobody lives in my condo than myself and my cat) it will turn on for like 20 minutes and then go off again..

@yaraiverymooreburgos 7 лет назад

my thermostat seem to lower the temperature by itself sample the heat inside will be 70 and the thermostat will be reading 67 after a few hour of working can this be the thermostat.

@acservicetechchannel 7 лет назад

The thermostat is supposed to be on an inside wall and not near an opening to the house. Also sometimes the hole in the wall can let cold air in from behind the thermostat if there is a bigger hole going into the crawlspace or attic. Other than that I would just replace with a new one. Thanks

@artbelden1343 6 лет назад

yaraivery moore-burgos. Mine doing the same thing! Reads 30 degrees, but its 80 in my RV. This is preventing the A/C from turning on. Let me know if you replaced your thermostat and if it fixed the problem. Thanks.

@AlphaGolf1 3 месяца назад

I had a call where the AH was running but the condenser was not. I had no voltage between C and Y at the control board outside or the AH. Pulled out the Tstat and jumped between R and Y and the system came on. Tstat was bad.

@carlosking8720 7 лет назад

Do i need to connect 3 wires together to check my heater? I mean the red is power and the fan wire plus heater wire? or just 2 wires red and the heater wire? Thanks

@acservicetechchannel 7 лет назад

Just two wires R and W as the furnace will know when to turn the fan on by itself. Thanks

@shawnavery6048 7 лет назад

I got rth5100b is there a video to show me how to hock it up in my RV

@BenD23 7 лет назад

Can you please help. I have a RTH2300B honeywell thermo. And whenever I press hold to permanently adjust the temperature it keeps going back to a number higher. It's literally blowing hot air where I want it to blow cool air. Thank you.

@Eddy63 8 лет назад

Awesome video. Good teaching tool ...please keep up the good work ...

@acservicetechchannel 8 лет назад

Thank you very much!

@jaelin38 6 лет назад

acservicetech I have a White Rodgers thermostat that is not working right. I have no control of the temp settings. I touch up or down arrow it goes to 90 by itself. Heat kicks on and run for maybe 2-3 minutes and drop to 62 and eventually cuts off. Is tstat bad? Please help me

@erics9213 7 лет назад

Before jumpering the R and G, I would use a multi-meter and check for 24V A/C between the R and C.

@acservicetechchannel 7 лет назад

Yes, sometimes there is no C to test from though, thanks Eric S!

@AK99581 5 лет назад

@@acservicetechchannel Was just going to say, that method wouldn't do you any good for a thermostat with batteries..

@robira1313 6 лет назад

Any idea why my heat pump won't shut off after reaching the desired thermostat setting? It does turn off if I turn off the whole unit at the thermostat. Just not when it's supposed to when it reaches the desired temp. Any ideas on that?

@acservicetechchannel 6 лет назад

Sounds like a bad thermostat, thanks

@em3477 7 лет назад

Thank u for the video. In my case the display will come on , the clock keeps flashing , but whatever I pressed is not responding. I did connect the red and green wire and the fan came on . Do u think it's the thermostat?

@acservicetechchannel 7 лет назад

If you turn the main power back off and on and the same thing happens it should reset that. If there are batteries and it is hardwired, go ahead and remove them before turning the power off and then back on. If the thermostat will not let you out of this function after turning the power off and back on it sounds like the thermostat is having a problem. Also look uyp your model number and verify the procedure for adjusting the clock. Thanks!

@em3477 7 лет назад

thank u for replying. it's Carrier A99068 model. press the time/Temp button and press the up and down until the correct is displayed, but when I did that nothing moved.

@acservicetechchannel 7 лет назад

Ok, yes it sounds like the thermostat then. Thanks

@chingonyayo 4 года назад

Thanks for the awesome video bud!!

@acservicetechchannel 4 года назад

Glad to help chingonyayo!

@draugami 3 года назад

My thermostat is set for 60 degrees at 3 am. The thermostat still runs at 68. Is the thermostat unrepairable? How long does a thermostat last? 10 years?

@mostlikelywedoitservices6926 2 года назад

Another way I have done it. I used the pins on the back of the thermostat battery operated type. Call for blower the pins should ohm out. Same thing for calling for heat. Make sure you are connecting to the correct pins because they are not marked you have to reference how the pins plug into the back plate.

@sallyraymond8328 6 лет назад

I'm still not clear under what circumstances should there be a jumper wire connecting the RC and RH terminals. I see in the video they each had their own wire back to the old system you removed that had separate transformers (furnace and one for AC) so I'm thinking since new systems only have a transformer in the furnace ...but what does the jumper wire accomplish?

@acservicetechchannel 6 лет назад

You are correct and the Rc can connect to G and to Y but the Rh only can connect to the w so that is why they need to have the 24v input voltage jumpered to both for a single heat and ac system, thanks

@christophermoore9897 2 года назад

So if you jump the 24v wire to the g wire and it turns on (thermostat is set to auto not fan), that means the thermostat is bad ?

@armenlock9619 7 лет назад

So clearly explained and helpful. Thank you so much. Lets me know if I should call our utility that installed the energy saving thermostat or if it's time to call an AC tech without wasting his time or mine.

@acservicetechchannel 7 лет назад

That is great to hear, thanks

@vausa1000 4 года назад

Thanks much. Helped a lot.

@acservicetechchannel 4 года назад

Glad to help!

@ferminrosa9620 Год назад

Thanks very useful ❤️🙏

@corinnemoring500 6 лет назад

I have a question the hurricane I just had knocked my power out for a day and when the power came back on my a/c unit didn't... What's wrong with it?

@acservicetechchannel 6 лет назад

Is the thermostat power on? Is the indoor fan not running or is it just the outdoor that isn't running? Basically, did the breaker turn off, did a fuse blow inside the unit or a fuse blow at the disconnect at the outdoor unit? I was just looking for more info, thanks

@palomapardo1744 6 лет назад

Hey, i just install a Honeywell RTH9585Wf but the screen is not powering up, i have the 4 wires for a conventional system plus the C wire. I traced the wires back to the system and they are loke this Red-R, White-w, Yellow-y Green-g and Blue-c, i also checked the voltage and i have 26 volts between r and c. This is the seccond thermostat i installed and it was the same issue. What could be the cause?

@acservicetechchannel 6 лет назад

Do you have 24v at the thermostat sub base or just at the furnace? Is R and Rc jumpered in the thermostat if available.

@palomapardo1744 6 лет назад

acservicetech at the thermostat and yes, i have the jumper between R and Rc, and i found this very weird since this is the second brand new thermostat that i install

@acservicetechchannel 6 лет назад

Make sure that the common is going to the C terminal and not the B terminal. Maybe try only wiring in the r and the c and leave the other wires off to see if it happens to work then out of curiosity in case something else is occurring with the other wires. Obviously this would just be to check only. thanks

@luisausay2462 7 лет назад

thank you very much SR. you are the man!!!

@acservicetechchannel 7 лет назад

I am glad you enjoyed the video Luis!

@bradh6185 4 года назад

I have a blank screen on my thermostat. Outside unit, so no drain pan. Thermostat wired to house so batteries not needed. However, the screen comes on when I install batteries. But nothing else happens. But the two snowflake icons flash. This is a 3-year-old PRO1 t701 thermostat with a Comfortmaker unit. What would you recommend I check? It's a hot Saturday night in Texas and having a heat stroke in the past, I don't handle heat well.

@acservicetechchannel 4 года назад

You would need to check the 3 or 5 amp fuse in the outdoor unit after turning the power off. test from r to c with a multimeter for 24v, thanks!

@libertyfox7486 3 года назад

Good Stuff, My pro TH8000 on Cool or fan, the heater turns on. This test should expose issue that I believe is 25 yr thermostat

@ricter591 3 года назад

Thanks Helps a lot.

@acservicetechchannel 3 года назад

Glad it helped

@joseph-ine452 7 месяцев назад

Outstanding. Great work

@acservicetechchannel 7 месяцев назад

Thank you very much!

@oscarpena7259 3 месяца назад

Thanks a lot

@human-sn7lk 2 месяца назад

I have a 2 wire Carrier edge thermostat- any way to test that?

@carybodiford4730 10 месяцев назад

Very helpful,,,thanks

@PhyllisBennettNana 4 года назад

Having problems with the air conditioning sometimes when it is on there is no cool air coming out..had a wellness ck up in june..guys said outside unit was fine just needed cleaning.. But once in awhile it seems the spark doesnt start the cool air..we turn it off for 10 mins..the on and it will start..could it be its not firing up correctly?

@PhyllisBennettNana 4 года назад

Also inside temp will say 82° and will not go any lower..til we turn it off for 10 mins then restart.we.always change batteries first a check fusebox..fusebox not hot..

@contraptor10221 7 лет назад

i put a new thermostat this summer honeywell RTH111 it work well , i try to turn on the heater today i hear the gas came on but the fan is not working or do i need to wait a little bit and the fan came on

@acservicetechchannel 7 лет назад

If the furnace is trying to turn the heat on then it is receiving the signal from the thermostat. It is past that and in the furnace. It sounds like maybe with the power off the capacitor should be tested or at least a tech will start there if the blower motor is not coming on. This one would test with the power off. ---- ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-flbUtLMeSOQ.html

@mikewhite7608 5 лет назад

thanks this video helped us at our home

@acservicetechchannel 5 лет назад

Thanks Mike!

@fftl1827 5 месяцев назад

So my AC and fan work yet my heat (propane) does not. I did the red and green as you instructed and the fan ran so could this be the reasoning behind my heat not working properly? Does this also cause short cycling?

@fftl1827 5 месяцев назад

If I wanted to check the heat I guess I would have to jump the Red and White?

@charolito1312 6 лет назад

Great video... thanks

@acservicetechchannel 6 лет назад

Thanks Charolito1312!

@amandastigger771 6 лет назад

So if the fan works, but the display light is out and the air conditioner won't come on, then is thefaceplate bad? Oris it another issue. I've replaced the batteries, but the display still won't turn on, but the fan will turn on.

@acservicetechchannel 6 лет назад

If you have replaced the batteries and it still won't turn on then yes I would replace the thermostat, thanks! Here is a link to the 24v Thermostat used in the video- amzn.to/2bDeUak

@stephenzoll4597 3 года назад

What’s wrong when the thermostat works on fan only ? When put on auto the ac and the heat don’t work. It does nothing, no sounds or anything

@dcmoor4662 4 года назад

I have a t-stat that allow the fan to come on when place in ON position, but the fan will not come on when placed in Auto and calling for cooling (only the comp. is on). Wouldn't this indicate that I need a new t-stat?

@acservicetechchannel 4 года назад

The thermostat should connect R to Y and G in the thermostat when calling for cooling. It sounds like the thermostat is not telling to fan to turn on so it is likely the thermostat, thanks!

@thewanderingadobo 7 лет назад

I did this test and it did turn on the fan. Is bad thermostat also be the reason why i got limit circuit lockout? Thanks in advance.

@acservicetechchannel 7 лет назад

No a limit circuit lockout would be from one of the sensors or from a component within the sequence of operation only. A thermostat is just a signal voltage going to the control board terminals. Check out this video on the sequence of operation----ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-uKsRpYmwlnM.html

@trinaparker9454 5 лет назад

Went through severe storms and had a big power surge several times. The unit wouldn't come back on and since it was cool weather I thought it was just the heat but it's the ac also. I have power to the unit and the tstat has it's digital readout but I switched from off to ac and nothing happens. So no heat and no ac and I really need my ac it was 95 in my house last night. Thanks for any help.

@acservicetechchannel 5 лет назад

Did you connect the r to the g to see if the fan would come on? Is it possible the thermostat has battery power but not 24v at the r terminal. The fuse inside the furnace may have popped or the switch or breaker may be off to the furnace, thanks

@vetdadcubby4722 8 лет назад

Thank you, looking forward to it!

@chriscavender9482 7 лет назад

My furnace no longer works in auto mode but does in manual on mode. Fan will run and furnace will fire and heat. Could the thermostat be the problem if it switches manually? Thanks

@acservicetechchannel 7 лет назад

Are you talking about the manual fan on and fan auto. If so then it sounds like the furnace is not calling for the fan to turn on after heating up. Do you have one of these and is the furnace older. If so, this may be bad. It is a fan limit control. --- ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-lroVoblI1pg.html

@jimmyung3212 7 лет назад

Thank you!!!

@acservicetechchannel 7 лет назад

Thanks jimmy ung!

@barryward192 3 года назад

I have a t701 thermostat it show rc and rh connect with a jumper do I jump with green and rc

@BBop23 6 лет назад

Shop my compressor won't shut off on it's own. On auto the inside system turns off but outside stays running I need to remove the fuse to shut it off. Is this a bad termastat? Please help

@acservicetechchannel 6 лет назад

That typically is the contactor in the outdoor unit has burnt shut. You would need to shut the fuse off at the outdoor unit and see if the contactor plunger snaps back up or is stuck down. Make sure the power is off inside and outside before checking because 24v is sent from the inside to the outdoor contactor and the outdoor fuse gives 240v to the contactor. Check out "acservicetech contactor video"

@katanatac 5 лет назад

My furnace fan wont turn off by the thermostat even when switched to the off position, what do you think the problem might be?

@n9neduece 5 лет назад

katanatac bad T stat

@katanatac 5 лет назад

Sorry, not really up with the talk of the trade, what is a "T stat"?

@acservicetechchannel 5 лет назад

It could be the thermostat, thermostat wires, or the relay on the board. Have you seen the acservicetech Thermostat Troubleshooting playlist and the videos at the top?- ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-pFF1Cj2VnDQ.html

@acservicetechchannel 5 лет назад

n9neduece was saying thermostat in short. Thanks!

@katanatac 5 лет назад

Now my transformer burned up, it had smoke coming off of it.

@KindCountsDeb3773 5 лет назад

My Honeywell TH5000 works, turns on ,etc. BUT it is wildly inaccurate. Displays wrong house temps and will come on in AC when temp reads 77 IN house and No way is the house temp 77. SO, I get very cold in my house on A/C. I'm Not technical, thought maybe I could reset/reboot it, etc, but not sure. Any advice??? thanks

@acservicetechchannel 5 лет назад

Sounds like you may have batteries that need to be changed in the thermostat or that the thermostat needs to be replaced, thanks!

@seshachary5580 6 лет назад

very educative thank you. regards

@acservicetechchannel 6 лет назад

Thanks Sesha!

@acservicetechchannel 6 лет назад

Sesha Chary, I am very appreciative that you chose to Support the ongoing work of AC SERVICE TECH through Patreon! Feel Free to email me any questions you may have at info@acservicetech.com also let me know what questions you would like answered or shown in the quarterly Insider video, thanks!

@christyinthecarolinas 6 лет назад

I have this same thermostat and I've changed with fresh batteries and the display is all wonky. It is only showing partial numbers. Any ideas?

@acservicetechchannel 6 лет назад

It sounds like the thermostat is bad or is not getting the right ac voltage on the r terminals.

@melindamanthey2757 4 года назад

The furnace is a TRANE TWV 025 B140A1 May 1994. The problem is no heat. The thermostat is an older mercury switch RHEEM. I would like to check the thermostat for continuity for heat. In the video you say to jumper red to white to check for heat , but how is this done if the green wire cannot now receive power so no fan, no way to check heat from the vents. Confused and would appreciate any advice. BTW cannot find any low voltage fuse for the transformer. ... supposed to be a 3.1 AMP... cannot locate. Shows on the legend, does not show on the schematic. Additional info. Installed a Honeywell non programmable thermostat as suggested by Honeywell. Could not correctly program and they were less than helpful. Re-installed the RHEEM mercury Thermostat. Same condition. Also replace Time delay fan manger.. Limit switch checks ok. This is why we suspect the T'Stat. Do you concur this may be the T'Stat ? Or? Baffled. Thanks.