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airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8275
Experience:  Furnace, A/C and heat pump specialist.
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I tried to turn on my Honeywell thermostat to A/C Auto and

Customer Question

I tried to turn on my Honeywell thermostat to A/C Auto and the fan would not turn on, no matter how low I turn the degrees down. When I switch to On instead of Auto the fan kick on and the A/C works.
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

What is the model on the thermostat?

Customer: replied 1 year ago.
I'm not sure. Just replaced the batteries. Same result.
Expert:  airheatman replied 1 year ago.

Normally when calling for AC the Y and G terminals both make sending voltage to both outdoor unit and indoor fan at same time.If thermostat is not doing so, the issue is in the thermostat.See below, If thermostat used to bring on fan in auto mode as it is currently wired and setup, it will need to be replaced.