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airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8253
Experience:  Furnace, A/C and heat pump specialist.
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Heil natural gas heat pump, The fan does not work on "Auto"

Customer Question

Heil natural gas heat pump
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: The fan does not work on "Auto" it does work when set to "On."
JA: Do you plan on doing the work yourself?
Customer: If the fix is simple
JA: Anything else we should know to help you best?
Customer: The unit is in the basement the control is in the house.
Submitted: 9 months ago.
Category: HVAC
Expert:  airheatman replied 9 months ago.

What is the issue you are having?

Customer: replied 9 months ago.
When the control is set to heat the unit will heat, but the fan will not come on when set to "Auto" it does come on when set to "ON" but it stays on and will not go off until turned off or set back to "AUTO."
Expert:  airheatman replied 9 months ago.

This is going to be a bad control board,.The fan is energized by relays on the control board. The board uses different relays for ON and auto. The relay on board that should be bringing fan on is not closing.