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Have a Amana a/c heater central furnace. Model number PGA30R0452A. The a/c part works fine. The heater part does not turn on sometimes. We have to keep turning it on and off to get to work. No matter what you hear a slight humming when we turn it on just it doesn't always blow air out of the vents. It also does not always kick back on once the temp. has dropped and should start heating the house again. We have programmable thermostat. Any suggestions to whats broken or breaking. My husband would like to fix it himself we dont really have the money to call someone out to do it. Thanks.

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When you change from cooling to heating the fan will not come on immediately. A solenoid valve is energized (check that it is working) and operates a reverse valve, changing the gas flow in the system. It takes a few minutes for the system to build up sufficient heat and then the fan will come on. The humming sound is very likely coming from the solenoid valve. Make sure the air filters are clean. Obstruction caused by dirty air filter can prevent the air sensor from sensing the return air temperature.

Posted on Nov 18, 2009

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