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Auto setting on thermostat does not turn fan on. Flame

Customer Question
Auto setting on thermostat...

Auto setting on thermostat does not turn fan on. Flame symbol comes on but no fan. Fan works when set to Fan mode.

Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?

Thinking

Contractor's Assistant: Do you plan on doing the work yourself?

Depending on the diagnosis...

Contractor's Assistant: Anything else we should know to help you best?

Nope, that's all

Submitted: 7 months ago.Category: HVAC
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Answered in 5 minutes by:
12/7/2017
HVAC Technician: airheatman, HVAC Technician replied 7 months ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,206
Experience: Furnace, A/C and heat pump specialist.
Verified

On call for heat do the burners come on then shut down bevause fan never starts or nothing happens at all?

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Customer reply replied 7 months ago
Heater works just fine with Fan in on position. Only Auto does not work. Flame symbol stays on, but fan does not come on in Auto.
HVAC Technician: airheatman, HVAC Technician replied 7 months ago

OK this can be of two things. The furnace board may be bad not sending signal to fan from heat speed terminal or the low speed winding in motor could be bad.

If you want to troubleshoot, give me model from inside burner compartment on furnace and let me know if you have a multi meter for testing voltage.

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