||12-07-2010 05:21 PM
older rheem furnace 1990 model rheem imperial 80
my furnace turns on then shuts off after a few minutes after about 15 seconds the igniter lights furnace starts and repeats itself 3 or 4 times then does not turn on. If I turn the thermostat off then on it will light up and and do the same thing.
||12-07-2010 06:02 PM
Furnaces shut down when they don't sense flame after several attempts. Turning the stat down then back up resets the safety. If it has a flame sensor rod clean it and the burners. Lots of the older rheems used the hot surface ignitor instead of a dedicated flame sensor so yours might not have one. New updated control board and sensor kit is more then you want to spend on a 20 year old furnace.
||12-07-2010 06:06 PM
check for codes also cleaning the flame sensor with steel wool may solve the problem
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