heater fan

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Old 06-26-03, 10:38 PM
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apnelson
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heater fan

Does anyone know why the fan on my central forced air heater come on by itself when the house temperature becomes excessively hot? This has happened 3 times in the past month when the weather was especially warm. We do not have A/C and the thermostat switches are fan: auto and system: off.
 
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Old 06-27-03, 07:40 PM
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I am guessing here because you don't give us anything to go on.

If the blower is located inside a furnace of some kind, it may have a fan control that triggers the fan by temperature. Like when the gas fire lights up and heats up the heat exchanger, the fan comes on automatically. If the unit is located in the attic and the fan-on temp is set low enough (like 120 degrees) it could be triggered by the type of temperatures that develop in attics in summer. If this sounds like it does not apply to your situation, give us more detailed info and we'll try again.
 
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Old 06-27-03, 07:56 PM
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apnelson
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That actually sounds exactly like what the problem is. Great intuition! Is there any way to change the temperature setting on the fan switch? Can it be done without compromising the heater function next winter? Or would it be simpler to turn off the unit completely until next autumn?
 
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Old 06-27-03, 08:05 PM
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If it is a Honeywell control, there is a dial inside the cover that had 3 pointers on it. The lowest one is for fan-off temp and should be set around 100. The middle one is for fan-on temp and should be at about 140. The highest one is for butrner high limit and should be set around 180 to 200.

If it is not a Honeywell, just use those numbers and explore the mechanism and set accordingly.

Ken
 
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