Man all the possibilities for continuity checks are so helpful that I never thought about checking the thermostat completely off the wall with batteries and wire. Thank you John.
Thank you than you thank you for this. I had figured out that my thermostat wire was broken somewhere but I had no idea how I’d figure it out. Your video helped me so much.
John, your amazing sir. I really appreciate you being humble enough to share your knowledge man. I have a job that I quoted for a short coming up next week. After watching your vid I'm aware that I could have done a better job at diagnosing. I definitely feel bad butttt with your help I can at least try to make a corrective action and possibly fix it boss. Thank you and keep it up.
I appreciate that. You are much too kind. You couldn't imagine how bad I have messed up in the past trying to learn the trade. It made me want to get better for sure. I still got a ways to go but I like helping younger techs with what I do know now. Keep learning.
Most contractors would run something like an 18/8 set of wire so you would have couple of "spare" wires to use that you could replace the yellow wire. Only once in my career have I had to completely replace the whole set of thermostat wires and only because there wasn't a spare that I could use.
I'm trying to DIY repair my home air handler that has obsolete relays in the heater controls. I've followed your video rewiring a old air handler and understand most everything...but My Carrier unit has 4 breakers, labeled L1-L2-L3 & L4...Do you have a video showing this style system being connected to a sequencer, strips and blower relay?
I don't have that one style in my shop. Do you have a model number? Do you have 1 main power source coming into the unit and then inside the air handler it splits into L1-L2, L3-L4? Or is it 2 different breakers from the main panel that feed the air handler?
John Jennings Could you make a video about the 24v when calling for heating or cooling.please . For example my understanding ( I'm still learning) if I call for cooling. I will have C to w 0v C to R. 24v C to Y 24v R to w. 24v R to G. 24v I'm not sure if you can simplify it both cooling and heating will be much appreciated. Thank you.
I do that as a last of 3 continuity checks but mainly if I see a fuse popped or breaker tripped. Probably more used when checking a compressor or other motor. In the case of this video I wasn't getting power in the circuit so I wasn't too worried about it being grounded. It was an open circuit.
Not really. I do it 2 ways. Turn power off and disconnect the tstat wire completely. So if checking the wire from air handler to outdoor unit I would put the wire on the outdoor unit end all in a big wire nut and go to the air handler end and fan them out like your fingers so that the ends didn't touch. Doing continuity from red to green, then red to white, etc. Until all wires were checked. They should all have continuity since you have them connected by wire nut on the other end. In my video, i had a problem with the yellow so it did not get a continuity beep when i checked red to yellow. I knew it was open. 2nd way is just removing the wire nut on that end and redoing the wire to wire check. Nothing should beep now. I do both of these if I am checking continuity. Lets me know what is touching on purpose and also what is touching on accident.
