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AC/Heating unit FAN comes on intermitantly all day

Posted by wilsonb on April 7th, 2003 01:50 PM

I have an electronic thermostat and the system is in the off mode. No
cool or heat mode selected.
The problem is that the blowers and fan come on randomly through out
> the day. They both come on then the vent blower goes off and the fan
> stays on for a few minutes.
> The outside compressor nor the gas flames fire up.
> It does this when the thermostat is turned off.


> I have a Janitrol Air conditioning & heating system in the attic.
> Inside the metal cover for the circuit board it says;
> Goodman Manufacturing Company , L. P
> Houston, Texas
> Ansi z21.47: 1991
> SBM17
> Model # GMP100-4
> Serial # 9402029277
It seems there is a sensor that is not set correctly or faulty, but I
could be wrong.
> I had the thermostat replaced 2X already.
> I checked the Flame sensors, by unplugging them- they are in series.
> Don't know if that's a way to check those. It still comes on.
> What else could it be?


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