Question about Honeywell Programmable Thermostat Heater

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Auto fan does not turn my furnace fan on-I have to use manual on

I have an oil furnace and a Honeywell Programmable Thermostat.
When I put fan on "auto" the furnace fan does not turn on.
I have to put fan on "on" for the furnace fan to turn on.
Do I need a new thermostat or is something wrong with my furnace?

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With the fan in the auto position, the fan only comes on during a demand for heat.  does it not come on during a demand for heat?

Posted on Nov 24, 2008

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2 Answers

Fan will not cut off even in auto position. It just keeps running


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Honeywell manuals


Turn the fan in the ON position to verify you have power to the furnace. If the fan turns on, turn it back to AUTO. Pull the thermostat off the wall to get to the low voltage wiring. If you have a gas furnace, pull the red & white wires off and pinch them together. If the furnace starts, the thermostat is bad. If it doesn't start, then begin looking for flame roll out switches in the furnace burner compartment to manually reset. If the furnace inducer (combustion motor starts, & you get no flame, then it is either an ignition problem, or someone didn't pay their gas bill. :0

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Hello,If just installed the thermostat check that the wires are not touching anywhere.If not the case you have a open(tripped) HIGH LIMIT at the furnace and the blower will continue to run untill it is reset.

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Some programmable thermostats have a circulate feature. This feature will allow your fan to run approx. 20 minutes per hour. This will insure better circulation, a better balanced temperature throughout the home & better air quality do to more air filtration. Read your thermostat manual to see if your thermostat has this feature and how to turn it off if needed. Another possibility would be on an older furnace with a fan limit control. If the temperature settings are set to low on the fan limit (or if the control is malfunctioning) you could experience a fan that runs a lot even if the thermostat is off.

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Sounds like a relay sticking. Possibly in the thermostat or possibly the furnace relay at the furnace. The next time it happens, unplug the thermostat from the wall. If the furnace still runs then it's the furnace relay.

Hope that helps...

Geno

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