We have 2 American Standard Freedom 80 furnaces, model ADD080R936E0. One of them is refusing to turn on. When the thermostat calls for heat, the status light indicates a call for heat, the flue draft blower comes on, and the ignitor glows bright orange. After about 10 seconds, the ignitor shuts off but the blower does not come on. After about 45 seconds, the cycle stops and starts again. After 2 tries, I get the error code “External lockout (retries or recycles exceeded)”.
When I start the other furnace, after the 10 seconds of flue draft blower and ignitor glowing, I hear a loud click from the control board and the burner ignites.
I think our control board in the bad furnace isn’t sending voltage to the gas valve and should be replaced but would love some advice if this sounds like the likely cause of the problem.
Thanks!
When I start the other furnace, after the 10 seconds of flue draft blower and ignitor glowing, I hear a loud click from the control board and the burner ignites.
I think our control board in the bad furnace isn’t sending voltage to the gas valve and should be replaced but would love some advice if this sounds like the likely cause of the problem.
Thanks!
source https://hvac-talk.com/vbb/showthread.php?2224233-Need-help-with-Freedom-80-furnace-that-won-t-light-the-burner&goto=newpost
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