My thermostat seems to be occasionally losing voltage on the power (R wire) coming from the HVAC. It seems to happen only when the heat is on and running, only if it's been running for a good 10+ min. After the power is lost, it will turn back on again, usually within a couple minutes. When this happens, the thermostat will turn the heat back on. But, like a most HVAC systems, it will not turn the heat back on until it throttles down and wait a minute or two. After that, the cycle repeats, but the next time it turns off, it happens much quicker than 10 minutes. I don't think it happens when the heat is off because the thermostat still turns on the heat consistently. The only two explanations I can think of are:
1) The control board is going bad
2) The 120V->24V transformer is going bad
I don't know how likely #2 is since the problem is intermittent; can a transformer only not work intermittently?
I can say for sure the 120V source is good.
Basically, I want to know if there are any more troubleshooting items I can perform before going out and getting a new control board? I have an older Payne/Carrier unit, I'm not sure what model number it is, but I attached a picture of the serial number plaque (sorry about the quality) as well as a picture of the control board packaging. Thanks!
1) The control board is going bad
2) The 120V->24V transformer is going bad
I don't know how likely #2 is since the problem is intermittent; can a transformer only not work intermittently?
I can say for sure the 120V source is good.
Basically, I want to know if there are any more troubleshooting items I can perform before going out and getting a new control board? I have an older Payne/Carrier unit, I'm not sure what model number it is, but I attached a picture of the serial number plaque (sorry about the quality) as well as a picture of the control board packaging. Thanks!
