Question about Heating & Cooling
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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Posted on Jan 02, 2017
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