Intermittent heat issue

Old 01-27-22, 05:21 PM
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Question Intermittent heat issue

My heat will not turn on normally in my house. It works intermittently and I have no idea how to fix it. The control board has a steady light which indicates normal operation. The furnace calls for heat, igniter glows, I can hear a click, which is when the gas is supposed to come on, and then the system shuts down. This repeats until I turn it off. Whatís weird is that it works sometimes and seems to be at random times. Iíve practically rebuilt the entire furnace with new parts and now Iím at a loss as to what to do.

This is what Iíve replaced so far:

Flame sensor
Gas valve
Primary limit switch
Air pressure switch
Cleaned burners / gas pipe
Air Pressure Tubing
Rollout switches
Inducer motor
3 thermostats (all new)

The only thing left would be the control board. Any help would be greatly appreciated.

Old 01-28-22, 10:29 AM
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Welcome to the forums.

Have you had the furnace checked and cleaned recently ?
You should have. It is not a maintenance free appliance.

Have you checked for 24vac to the gas valve ?
It will only be there for several seconds before the cycle restarts.

There is a sticky on furnace repairs at the top of the forum.


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