I used to watch your videos a couple years back when i was new to disgnosing and theory. It was like another language. Now i can watch a video and fully understand everything you teach. I also bought all your books and flash cards so i can train my 9 year old son in a few years. He cant wait.
Hi Craig Thanks for another wonderful educational video, I hope one day you write a book about Furnace operation and troubleshooting, if you do it would be the first book specially written by a professional Technician for other technicians. Grateful job as usual ❤❤
Help me with my problem sir. My AC unit keeps turning off and on intermittently with error code e74 (no power detected to RH wire at nest thermostat. Sometimes it runs nonstop, then shuts off with the error message saying no 24 volt power detected by thermostat. Then a few minutes later would start running again all by itself. I checked the thermostat wire connections they all are firmly and snugly are tight. No obvious drain pipe blockage, the fuse is normal. It just acts up on its own. Had 3rd gen nest thermostat, then upgraded to 4th gen thermostat, and both thermostats are showing the same error message. Thanks.
As always this is an excellent top-notch video. I do however have one question. Why are all of the gas supply lines galvanized pipe instead of black gas pipe? Isn't that against code?
I wish you'd explain how to fix the Led not turning on. I have this situation where my furnace Led doesn't get power at all ever since I had a breaker switch flipped off and on. I've checked my transformer it does work but doesn't power the board. The problem does seem to come from start like you've showed but where's the fix to that?
Thank you so much sir for sharing your knowledge! I’m sure you have saved millions of dollars for your viewers. I have truly benefited from your classes. Please please continue the great work you’re doing. You saved me thousands of dollars! My Broad Ocean ecm motor alone was a quote of $1500. An a/c tech I previously used, suggested I put 2k with the $1500 and just replace the entire unit. After watching your videos I was able to narrow it down to the motor. There were no swollen caps, burning smell or anything. The motor looked new. I ohmed out the motor and checked the plug that revealed the motor was good but the module had to be the fault. I replaced the Broad Ocean with a Johnstone unit and everything worked out fine. Thanks again!❤
Just repaired my 1980's Carrier 397H furnace. Although the fault was highly likely the main control module (one of the relays looked burnt), I've replaced other parts with new ones (limit switch, sail switch, inducer motor control modle, pressure switch & the main control module). I do not trust contractors as they never arrive on time and charge ridiculous $$$. As an airline tech, this furnace was so easy to work on with so few parts to deal with (very reliable & durable and I found the service manual online). The total cost of repair was about $250 and replaced the main control module with upgraded unit with OBD-I type diagnostic LED (ICM275). The furace is up & running again.
Changing the control board that's costs $250 for the board itself would cost about $900-$1200 depending on the company coming out. Mind you they need to come out and diagnos the problem then they need to find the board, pick it up and come back and replace it. Between driving to you, diagnosis, picking up the parts and coming back, replacing the parts then testing the system. It's already $250 for parts. They're about 3 hours in. They probably are getting paid 35$-50$ an hour. Gas for their truck. You're already at around $400-$425. Company needs to make money plus they need to stand by their work so if there is an issue they have to worry about coming back. In the end everything does add up. For me personally doing side work and not having to pay anyone but myself. I'd do that repair for $350 plus parts. That'd include the diagnostic and arrival fee.
Hey I know this has nothing to do with this topic and I wanted to ask a credible source I was at a local Goodman and I saw a Daikin air handler and it had 2 transformers in it with a big board do you know what the use of the second transformer is, also I’m an apprentice I’ve been working as a helper for about half a year
I just had a York furnace flashing 12. The panel listed fault codes 1 through 11 so I had to call tech support. They said it was either open circuit on the igniter (it wasn't) or bad board (which it was). Good news was the new board had fault code 12 listed. Just good info to know.
Hello Craig, as always your one of the top technician/ teacher another nice video I can’t stop watching your videos. Could you please make similar videos on Lennox because I am a residential maintenance technician I really need to move up… thanks.
Amazing video, great quality, well said for everything. 1 thing you are missing is for CODE 32, you need to take off the short pressure switch hose going to VEA, AND SEE IF THERE IS WATER BUILD UP THERE. And if there is, you would need to take off the VEA and check and see how bent the silver fins are, normally there are 6 fins, they need to be bent 90 degee angles towards HEX. Let me know if I am wrong where Craig, thanks
