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Kcrand36, HVAC Mechanic
Category: HVAC
Satisfied Customers: 77
Experience:  Owner at Advantage Repair
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Air handler fan is running with setting on auto and system

Customer Question

air handler fan is running with setting on auto and system is set on off
Submitted: 1 year ago.
Category: HVAC
Expert:  Kcrand36 replied 1 year ago.

good morning, I am Kevin one of the techs here on JA. Can you give me a little more information on your air handler unit? Model or serial number?

Customer: replied 1 year ago.
It is a GMP& GMPE power vented multi-position gas furnace from the Goodman Manufacturing company. I can not find a model or serial # ***** I think it is behind unit. Unit is in attic I can not get around back of it no room. did not open access panel. Heat and A/C work fine just when system is turned off. The fan runs for awhile shuts off for awhile then back on
Expert:  Kcrand36 replied 1 year ago.

do you have a humidifier installed in this unit?

Customer: replied 1 year ago.
Expert:  Kcrand36 replied 1 year ago.

Three other things you can check.

I would disconnect the G wire at the furnace unit ( this is used for cooling, so if you are done for the cooling season, you could disconnect this temporarily) This will narrow down to the furnace or wiring/tstat problem. If the problem continues after disconnecting that wire, then your problem is most likely the control board at the furnace. If it does not continue, then reconnect that wire, go to the thermostat and disconnect the g wire at the thermostat. Again, if problem continues, you have narrowed it down to the wiring, if it does not continue, it is the thermostat.

Customer: replied 1 year ago.
Thank you I will try
Expert:  Kcrand36 replied 1 year ago.

If there is anything I can help you diagnose further on this issue, please feel free to contact me....

Thank You,


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