Manual fan mode on thermostat doesn't work but auto does


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Old 10-15-17, 08:41 AM
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Manual fan mode on thermostat doesn't work but auto does

The manual fan mode on the thermostat doesn't work but auto does. This was a new furnace and AC system install over a year ago and I was very disappointed in the contractors work. I will call someone new back to the job to fix it before I call him. Hope I can get some help here before I call someone else.

The furnace is a Heil G9MVE
The AC is a Heil Performance 13 N4A3
Braeburn 2020 Thermostat with 4 wires with Rc wire jumped to Rh
 
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Old 10-15-17, 10:27 AM
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If fan works with a/c then sounds like a bad thermostat.
 
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Old 10-15-17, 12:13 PM
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Welcome to the forums.

At the thermostat end..... take a small piece of wire and temporarily jump from R to G. See if the blower starts then. If it does.... the stat is definitely the problem.
 
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Old 10-16-17, 09:13 PM
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Thanks. I jumped R to G and blower kicked on. Man that blower is quite. So new thermostat?
 
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Old 10-16-17, 09:28 PM
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Yes... that would indicate a defective thermostat because putting the stat in FAN ON mode connects the R to G.
 
 

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