Have HVAC Questions? Ask an HVAC Expert for Answers
Please provide a few more details. Do you mean when you turn thermostat to heat, everything comes on, then shuts right back down?
The t-stat is set to heat. The furnace will turn on and then immediately turn off and keep trying to turn on over and over. I can hear clicking from the board during this time as well. The light comes on, on the circuit board and goes out when the furnace turns off. On then off. On then off. What is weird is as soon as it kicks on, if I turn the t-stat to the off position it will stay on much longer. Then time out and turn off.
Do you have a volt meter to check and see where we are losing power?
Yes. I have a volt meter. This is the frustrating part. I just turned it off at the t-stat so that it would not keep trying over and over, and it stayed on for almost 10 seconds longer.
I cannot find the what you stated. I do have 120 steady coming into the 24v transformer. The meter jumped when I had it on hot and touched the side panel of the furnace. Is it possible I have a short somewhere?
Check the high voltage connections where they wire nut to the furnace wires and make sure they are not loose
Ok it seems like all is good up to the control board.Are you getting a flash code from the LED on the board when you turn power on?
No, the light comes on as it powers up, then goes off with the whole unit. But no code of any sort. It was one of the first things I looked for.
If the 120 is steady to the transformer and the 24 volts is steady from the transformer I am going to say you have a problem in the control board.However, this board runs a couple hundred bucks, so I would recommend having a tech verify before replacing the board