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Phil
Phil, Mechanical Engineer
Category: HVAC
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Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Fan motor will not stop running Gas fires up and shuts off

Customer Question

Fan motor will not stop running Gas fires up and shuts off but the fan keeps running..
Any ideas ??
Submitted: 11 months ago.
Category: HVAC
Expert:  airheatman replied 11 months ago.

Most likely a sticking fan relay. Make sure thermostat FAN selector is auto position not ON. If fan still runs, disconnect thermostat wires at furnace.See if fan goes off.If not, and no error codes, it is a sticking relay.Many furnaces have relay built onto control board and if so will require replacing control board.Can you do some hands on like this and do you have a volt meter to troubleshoot?