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Combustion air switch stuck

Posted: Mon Oct 04, 2010 8:28 am
by allan57
I have a model # DGAA056BDTA coleman furance. the code light is flashing (combustion air switch stuck closed) The furnace will not run. Is it that the switch or could it be the fan combustion air boster motor. This is the first time we tried to start the furnace this season.

Re: Combustion air switch stuck

Posted: Tue Oct 05, 2010 1:57 am
by Robert
Can be bad pressure switch, bad booster motor, pressure switch tubes kinked or clogged, air pipe to booster assembly clogged or damaged.


The most common is the pressure switch.


Thanks,
Robert

Re: Combustion air switch stuck

Posted: Thu Oct 28, 2010 6:43 pm
by danr48174
is ther a way to bypass the switch to asure the swicth is bad abd not the motor?

Re: Combustion air switch stuck

Posted: Fri Oct 29, 2010 12:41 am
by Robert
Hi,

No, you would need to check the water column pressure at switch to know if motor is working correctly.


Thanks,
Robert