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airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8268
Experience:  Furnace, A/C and heat pump specialist.
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I have a 2ton unit and having problems with the unit's fan

Customer Question

I have a 2ton unit and having problems with the unit's fan staying on after the temp. has been reached and furnace is off.
JA: Did you check the furnace's filters?
Customer: no.
JA: Do you plan on doing the work yourself?
Customer: yes.
JA: Anything else we should know to help you best?
Customer: about the filters, i have recently changed the filters.
Submitted: 7 months ago.
Category: HVAC
Expert:  airheatman replied 7 months ago.

1. Look inside furnace and give me model number

2. Does unit heat properly except that main fan keeps running after thermostat is satisfied?

Customer: replied 7 months ago.
Furnice is in the attic Will take a while to get number. Furnice works fine except for fan operation.
Expert:  airheatman replied 7 months ago.

Issue is going to be the relay is sticking that conrols the fan.If your furnace has a control board the relays are built into board and you will need to replace board.

Expert:  airheatman replied 7 months ago.

am unable to take phone call right now. This will be presented to my colleagues so you may get a call from one of them if available.We can continue here to try to solve your problem.

Customer: replied 7 months ago.
I want to know if the problem is related to the thermostat or in the furnace. Is there a way to test the thermostat first?
Expert:  airheatman replied 7 months ago.

Absolutely. Disconnect the R wire at thermostat and see if fan goes off.

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