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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a honeywell thermostat that is playing up. I have

Customer Question

I have a honeywell thermostat that is playing up. I have switched the heating/cooling off and the fan remains on auto. However the fan is still running and I have had to switch the breaker off on the panel. The batteries have been changed and the unit is clean. Any thoughts please.
Submitted: 1 year ago.
Category: HVAC
Customer: replied 1 year ago.
It is a Focus Pro 5000
Expert:  BillyHvac replied 1 year ago.


My name is Billy.

The majority of the time this is the furnace and not the thermostat. 99% of the time a relay or circuit board issue is the cause.

Remove the top section of thermostat....if fan still runs it is the blower relay or circuit board in the furnace.