Oil furnace cad cell and relay 

I would like to thank you for your unselfish videos. They have helped a lot of folks have a warmer life. It's good to know that folks like you are out there to help people that have some technical knowledge but lack the information to apply them. May God Bless.

Thank you for taking time to organize and thoroughly explain the function of these devices. You took us out of a frigid bind. Health to you and yours.

Thanks for the helpful video! I got my Cad Cell cleaned and furnace back running again in 5 minutes after watching your tutorial....

THANX BROTHER! THIS IS THE SECOND TIME YOU BAILED ME OUT WITH YOUR KNOWLEDGE AND EXPERTISE . THE THOME FAMILY THANKS YOU SIR.

Matt C. from Portland, OR Sir, I thank you. I consider myself handy, but no expert. I had flame, I have oil, but the furnace kept timing out. I checked the cad sensor, looked good, but cleaned it anyway. Still kept timing out. I let the furnace cool down for awhile (important) and reached my hand down in there and realized that some of the fire proof packing had fallen down into the burn hole, thus blocking the cad sensor from seeing the flame. Cleaned that out, and now running great. Your video didn’t offer up that suggestion (you may want to include in the future), but I would have never thought of that without your whole explanation.

Wow. My wife came down and said there was no hot water. I watched a few of your videos and finally got around to this one. It was the exact problem, a little carbon on the cad cell. I will call my furnace guy tomorrow, but I am avoiding an emergency call tonight. Thank you!

I LOVE YOU MAN!!! After hours/days of troubleshooting I went back to youtube for the 5th time and finally found your GREAT Video!!!!! THANK YOU!!!!!!!!

Thanks for the trick about resetting from restricted mode. I had changed my oil filter last night and forgot to bleed the air out. Later on when the boiler didn't start, I bled the filter and tried to bleed the air at the burner, but I had hit the reset too many times. Finally, at 3am I found your video and now I have heat. Wife thanks you too!

Thanks, You published in 2012 and I benefit in 2017. Great work, took me 2 minutes to fix the prob

You also saved me a service call, about $135 for me. It ran out, I filled with diesel, pressed the reset twice which led to lockout mode. Learned how to bleed the system, and this video explained why I shouldn't reset it again, and how to get it out of lockout mode, and after bleeding the system I got the heat working again. Yes!!! I finally learned more about these Honeywell devices and how they work, and how to get the system working again. A Big Thanks!

Thank you! You saved me $250.00 (since i was just quoted that) its new years eve and a sunday and no oil delivery today and serviceman charge more since its Sunday and a holiday weekend. I have never bled a burner before and your directions worked like a charm. Thank you and happy new year

This video has saved the day 2 times for me now. Thx from Toronto

I have to thank you and I really hope you know how much your video"s help people like myself out. I'm just a hard working guy like most that doesn't have the extra cash to say screw it and call a repair man the first hint of a problem. The cad cell carbon was all my furnace needed but the repair guy would have charge me 80 just for his drive. Again thank you.

Thanks for the video. The 45 sec reset was all I needed to get furnace to light off. Guess it must be time to have the furnace cleaned.

Hey Grayfurnaceman, this isn't about how much money you saved me... but, more about the respect I have for you sharing your time & knowledge - Thank you!FYI - I have one cousin, one nephew, and one brother-in-law all making a living in the hvac trades... none of which either could or would help me diagnose issues with my ~40 year old, forced-air, oil burner furnace. It's finally working great and I owe it all to your educational "how to" trouble-shooting Video's.After working through the frustrations of learning the safe operational workings of the oil fired burner, I now know why the above mentioned relatives wanted nothing to do with my furnace. By the way, and thanks to you, I have learned these heat units are simple and reliable if you properly maintain and service them at correct intervals.In closing, I love my "Frankin-Furnace" so named because of all the borrowed parts, it's running great because of what I learned from you.B.

I want to thank you for saving me $100, plus having heat again. My fuel oil tank ran out, my fuel man refilled it, but I knew that I'd have to bleed the pump of air, something I've done before. I hit the reset from the modern electronic version of the cad cell you described. Needed to hit reset twice because all the air wasn't out, then nothing, I was locked out. Found your video, held the reset for 45 seconds and wow! pump began running, Bled just a little more out and had a flame. Now everything is fine. Can't thank you enough.

Excellent, concise, informative....great video...thank you

Best explanation on youtube. Thank you!

my oil heater just stopped working. thinking its the capacitor on the burner motor your videos are helping me immensely thank you I subscribed

Thank You. I teach HVAC Survey Level at High School Level for a Public School.

Thanks for the tip on the lockout. you saved me visit from the oil company!

Thank you so much for this video, helped me alot. God bless you.

Thanks for the support. GFM

very good video. you make great teacher.

Great job Gray

Very well made video as usual!!

This is a very Good educational video, thanks for posting.

Thank you for your very helpful help.

Thank you grayfurnaceman.

thanks for the video you saved me a service call!!

I like the cad cell testing.thanks

Great video

Great videos.

thanks for the tip on the digital relay someone had peeled the sticker and i couldn't get it to stop being in lockout. its a pain in the arse setup if all your trying to do is bleed the air from the pump after filter service. to pushes wasnt long enuf to get all the air out

so when I go down to check my boiler after watching your video I do what you say. I'd been using the end of a broom stick to reach the red button on the control panel to push it. I had the cover off and bumped the side of the Beckett burner and notice it lighted without me pushing the red button. I said to myself "Self check the ground" on the control panel. I notice that I could wiggle the control panel which should have been screwed down good to complete the ground. My boiler guy was here a couple weeks ago to clean it and apparently forgot to screw down the control panel screw tight. So I did and sure as shit that was the problem. After 5 days of no heat and messing with the control panel reset to light the burner when we needed hot water. The dayum thing was fixed!!! When dealing with electrical stuff always check the power and ground first. I spent around $65 on a new control box and shipping now I have and extra part that's not needed.

You seem like the man for this. I recently replaced a Coleman furnace that was about 25 years old with a much newer miller with a Beckett af15 burner assembly. The furnace worked in the house it was removed from. After installing it in my mobile home it fires instantly when the motor starts, stays fired for half a second then flame goes out and the motor still runs till the timeout. the happens each time it is reset. This is supposed to be a delay start. My tank is full with a new filter installed coming off it. I ran about a gallon of oil out the bleeder with no air for the last half of it. The cad eye tests good. The cad relay on this unit has 4 wires aside form the cad cell wires. Black, white, orange and purple. The clean cut valve is wired with the burner motor on the orange wire . The ignition is wired separately on the purple wire. I am reasoning that the valve is receiving power whenever the motor is running and some sort of delay was built into the vale which is malfunctioning.

gray furnace man, I have been watching your videos for as long as you have been putting them out and never fail to learn a new trick. my question is, do you still teach, and if so where can I attend a class.

Thank you sir.

I have a rheem lowboy with Beckett AFG. been acting up or tripping out lol! I replaced cad cell & nozzle, cleaned & adjusted electrodes but now must hit reset-sometimes 4-5x's to start motor then fires & runs for a period of time5min, 20 min, even 40 min today but shut off just 2 degrees shy of thermostat. I've tried 2 BN white rodgers 668-401 relays but they never do "anything"? so I put the old one back on to at least get er going again? I believe the fan/line limit switch on stack is working correctly too.

Dido to Henry. Thanks for the info!!!!

This was an excellent video. I was wondering how to test flame detectors and it appears a simple multi-tester will do the job. I live in a rural area in Colorado where oil heat is not common. As such I am unable to find anyone to work on mine. Been doing most of the work ( with help of a good chimney sweep at one point) for the last fifteen years. Was able to have the bottom of the boiler relined about twelve years ago. How often should this be done?

Good point GFM

Sir, Please give me a list of these compatible with each others, 1)relay box 2) spark transformer 3)cad cell 4) High temp Limit switch... My boiler is Burnham has ONE control Box with item 1 and 4, it goes bad and expansive to replace.... I know how to wire. This video explains too. Thanks from all of us for saving our hard earned money.

Just bought the Beckett Geni Display Tool, my hot water heater has a intermittent soft/hard lock out, next time it does it I will be able to tell what the problem is, the display tool should have lock out history....

my cad cell went out after my thermostat died.I changed my thermostat and the cad cell light is off but it kicks on with a green light when I turn on the heat. I haven't found any video or thing on the internet about this happening.

Really good video Grayfurnaceman. I have the more complicated primary control with the lockout safety feature. After watching this great video, Im convinced my issue is my Beckett clean cut fuel pump. I've bled the fuel from the port. I've cleaned the filter. Still wont go. I've unscrewed the high pressure fuel line from the burner and ran it to see if fuel was going through the pump and to the burner and nothing comes out! Do you have a video on something like this? Or any tips? I'm definitely subscribing to your channel.

My brothers has a jumper connecting two of the wire hook-ups.

I am having the same problem with L-7224U triple aquastat.Haven't figured it out yet.I know you have to set your low and high limits. 160 low 180 high. You might have to to turn your LL to off on a cold start boiler. I can't get voltage to the stat terminal. I might have a bad primary.IDK.They had the old style, but it was 60.00 more. If I only would have known......Steve

Have an Intertherm oil furnace that we have to keep hitting the reset button. The furnace will fire run for a few minutes and then kicks off. Any suggestions. this is in my sons mobile home and the grandkids are suffering due to the home being so cold

Mine cad cell might be bad I just want to know if the transformer has any stored voltage after you shut the breaker off and if so how to jump it out

I have cleaned the cad cell (after watching the videos) but the heater is still tripping off, and there is a spark sound before and after it switches off. What might be the problem???

In addition aren't these controls also connected to and governed by the aquastat which puts the boiler temp into the equation? I guess that is connected internally, not on the outside connections.

Its nice to have heat. GFM

hello Furnaceman, I have a R784B honey well 3 strikes your out Cad cell relay, it has the wiring for the oil delay solenoid, I really like these relays because they shut off the ignition once the flame is established which saves the ignition transformer from wearing out. I am up north in Victoria BC, I am a oil burner tech. My question is can I replace my Beckett oil delay fuel pump with a Dan Foss 3450 fuel pump that does not have a oil delay solinoid, I find a lot of the newer fuel pumps tend to leak from the shaft seal. The Dan foss pump shaft seals are bullet proof I never have problems with them. it seams like the Beckett fuel pump seals almost always leak after the warranty runs out or sometimes when they are 2 or 3 years old. I know our heating fuel is much different than 10-12 years ago. thanks for the video. Steve

u the man

i have allanson transformer ignition but i noticed there is no cad cel eye inside, my question is should i ne worry about it? but my boiler was working. what is the main reason/purpose/importance of cad cell eye? thanks so much

Please help Any advice is appreciated! I have the second black box you showed that has the extra wiring. The light will not come on. Only time it will is for a milli second only when I flip the breaker on but it goes right back out. So it’s not getting power. I changed the breaker it does the same exact thing. Where should I start? Single mom here. Thanks I’m advance.

hello and thanks........can you recommend a 3-4ft. flexible oil line that connects to the suntec pump from the filter housing? this is to replace the copper tubing, so I can open the utica boiler swing out door without having to remove the copper oil line.

I'm thinking about replacing it with an R8184G which has intermittent ignition. Would that work OK?. Thanks

My Riello oil furnace starts (ignition/flame), runs for 1 second, shuts down (pump but no flame) then fires up again and runs fine. Seems it takes that second attempt to run successfully. Cad cell failing?...

What to do with extra oil on the combustion chamber ?? How can I turn the heat on safely after a repair is being done?

I don't think it makes a lot of difference, but I would not take the paint off. GFM

Very helpful video thank you so much you just save me at least$300 dollars

great BUT I have a electronic switch on a weil mclain QB-180 with 6 wires and told to change to the honeywell like you showed??? which wires go where i understand all grounds get tied together but??

when i switch on burner it starts but after 5 minutes it stops no light comes on to press restart it reaches a certain temperture and knock off but will start up again when cold

At 2:00 that looks like my 35 year old 5 wire relay. Trying to find another one like it but all they have are 3 and 4 wire relays. I had to sand the contacts on the relays. Still works but sometimes does that fluttering with the relays and then it grabs and starts. Any ideas? Thanks

Love your videos, can you explain the sequence of operations?

So currently Because it is such an old Wayne burner on my Miller MOC 100 Do you think it would benefit from one of those external timed solenoid valves? Supply house has one that you add in the nozzle line with a 4 second delay $88 for burners that don’t have the control with delay contacts or a clean cut pump.

I was wondering about the transformer always running. I had to upgrade to the newer honeywell control box and could hear the transformer stop sparking, I was wondering did the old box always keep it running?

TT wires only go on that control for a warm furnace you should specify that TT is jumped out for boiler applications

I have a weil McLane boiler and a honeywell cad cell relay. the cad cell is clean and works as per my thermostat. fire comes on but the safety still kicks off. any idea what I should be looking at

hey gray furnace man when cking the transformer on the newer style do you ck it by jumping the spark like on the older ones or by a meter if so let me know. thank you. t cobb

lets say I want to test if the transformer is sparking, so I open up the cad cell relay and shine a bright flashlight into the cad cell...question: will the transformer be energized for testing or is the flashlight a different light source than the flame??...would appreciate comments...

HEY FURNCEMAN!!! Great video!! So on my oil burner/boiler I have that last relay with the red button and green light that locks out if pressed more than once. What happened to me was that I let my oil run out and my burner went off. The oil man refilled the tank but didnt restart the system. (I'll deal with him later). Now it wont go on. I changed the filter, but the motor isn't running. The green light is blinking and I realize that its on lockout mode. Once I hold it for 45 seconds and it DOESNT fire back up, is the motor bad??

Hi , is there a way to bypass the controller.Mine broke and i m broke also.I'd like to open the burner for like 10 minutes to get hot water for bath.I was thinking maybe i can connect some cables and get the thing started manually.

Is there any advantages in having a relay that keeps the spark on all the time (transformer always energized) when the burner is running ? Thank you

thanks for the repair videos, my Beckett burner will run fine for half hour or longer than shuts down and will not restart, transformer was replaced and burner serviced and cleaned last year,,, heat only thermostat installed 4 years ago, any ideas before I call a burner repair man? thanks

Hello , I have an older metal HARVEY R75-58R / HONEYWELL R8184M Oil burner control ignition, A lot like the 2nd part that you showed, ( Don't see any Trip Button ) And you was saying i should be able to push the reset button many times as needed, But the thing is that i had to press the reset button a few times when it would trip after running about 10 mins and now i have a hard lockout problem like on the 3rd part Honeywell plastick newer one that you showed , Any ideal what needs to be done to get it unlocked ? Aiso it looks like it has a little red light near the reset button like the one you showed but i never see it come on .

My R7184P will not start ive held the reset button multiple times light will not flash but there is power going to it i shut of the power and turn it back on the green light flashes once. But when i hold it for a reset lockout wont do anything

My furnace runs for about 3 to 5 minutes then the Honey well r8184g4009 starts clicking , doesn't shut off but clicks three times real fast stops for 10 secs then clicks again. Oil boiler weil Mcclain Any ideas?

ok , have zero $$ and its going down to 17 tonite ... fairly new carlin unit starts and runs good but shuts off after 30 seconds or so ... any way to jump out cad cell ? i know i know , I'll keep a close eye on it and shut off after house warms up ...

Hi Garyfurnaceman ..I,m just wondering how does fix the probelm of the reset button press to many times .It was press like around 6 times ?

Hi, i like to know ,ask you if you know,that what temperature should i put my (hi and low), in winter time, to be best in fuel saving oil condition?I clean and service my own oil furnace.

My Rudd oil furnace will run and run and run and has gotten up to 99F in my house if I don't catch it and turn off the main switch. The thermstat has been replaced so that is not it. A friend moved some wires that were attached to the little fuse box on the opposite side of the wall where thermostat is mounted and the furnace went off. What is that little fuse box for and do you think if I just replace those wires it will turn off when it reaches temp? I have to turn it off when I leave the house in case it decides to run and run again. It worked for 6 days after he moved those wires apart, but did it again today.

I have a Lanair mx300 that will kick on but will not fire. I've just replaced the ignition and brass washers that touch the ignition arms. Any suggestions?

i have a oil heater furnest. my thermostat i think dont work properly. i set to 70 degree and the house temperatures goes down to 65 and doesn't heat the house

any reason why my ignition transformer goes bad, replaced in Oct 2018 had to replace today due to weak arc?

I need some help with my thermopride, my green light won't come on but fan kicks on, thanks!

New nozzle new filter and the thing keeps on cutting out. Reset after 15 secs furnace starts running then cuts out. Re bleed till oil is running clean and it still cuts out. What advice have you got for that?? Fairly new hot air Beckett. 1/2 doz. yrs old maybe. thx

Hi, how likely is that electronic ignition control unit stop working? And how does one test to see if it is no longer working? I have a unit like that R7184P and I don't know how to test it to make sure it is still working. Thanks for your help.

and the thermostat was reaplace one year ago

I have new boiler installed a few month ago- SlantFin boiler/ Beckett oil burner with the control (GeniSys Model 7505). A few weeks ago, the system was shut down with red flashing light on reset button. By pushing reset button once, it started to run again and worked since then. (I was out of town a few weeks so I'm not sure if it's been working continuously.) Last night, the same problem, I pushed reset button and restarted, however it was shut down again in the morning. It appears something keeps shutting the system down. Oil is in the tank and it's been tuned up by boiler man last time he came out to check a few weeks ago. Any idea what could be the cause of the problem? Could it be faulty control or wiring? I'd appreciate any insight you can offer.

I have a cad cell that was changed now carlin control blinks amber burner comes on then off does it a few times then it will runs fine makes temperature what could the problem be??? Primary control is a 60200-02 rev b The control never locks out red

the pressures is fine. i set the the dial on the thermostat some times to 74 then i heard the click on the thermostat. the actual home temperature goes to 72 and sometimes few minutes i hear the click again on the thermostat. then later the baseboard is getting cold. then i turn up the dial... in order for the house to be in a 74 temp. i have to turn up the dial to 78. can u explain why... or ther is something wrong with the thermostat l.

I've got one that has been stumping me. I've got an older miller furnace with a beckett burner, I plan on heating my garage with it. It will run like a top for 13-15 minutes and then trip out the primary controls red button, if you reset it the furnace will not ignite again. If I allow it to set for 1/2 hour or so it will fire up and run for 13-15 minutes again and repeat the same thing. Any ideas?

To take out cad cell, can I just turn service switch off and take it out

My furnace just stop working last night and I have been manually lighting the pilot all day. I have bleed the pump, cleaned the filter and bleed it again. Every time it tries to light I get a lot of white smoke coming out but it doesn't start. Can you help me?

Need help. Had a flood in the basement with a new furnace, so I shut off the emergency switch to the furnace. I waited for the basement to dry for a couple days and then turned the switch back on. When I checked the furnace there was no light at all. I turned the circuit breaker off then on. My indicator light is now blinking (I assume it's in restricted mode). I tried to bleed the lines, but there's only a slow drip of oil. I held the reset button for 45 seconds. I can hear something trying to happen, but it goes back to blinking (restricted mode?). Where do I go from here?

I have the older type Honeywell relay and it hums constantly. Is that normal? Best regards

mine continously is flashing? any help. i changed oil filter and air filter. i had it running, then shut off, now i get nothing.