comfor 92 code 31


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Old 12-24-11, 07:09 AM
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comfor 92 code 31

carrier comfort 92..code 31...which is pressure switch code...i replace pressure switch with known good switch..same problem..i removed cover for burners, furnace fired up...replaced cover, furnace will not light..removed pvc pipe from air intake combustion chamber, furnace will light..checked and double checked air intake pvc tubing end to end, no obstructions..all other tubing seems to be clear and open..what else could be the problem of not closing switch (normally Open)...here is pic of unit


By gatorchin75 at 2011-12-24
 
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Old 12-24-11, 07:20 AM
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check the exhaust as well, also clean the condensate trap on the left side of the furnace. Ensure that there are no sags in the exhaust pipe. It should be sloped at least 1/4" per foot from the termination point to the furnace.
 
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Old 01-01-12, 05:00 AM
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we hooked manometer to inducer motor, it was not putting out enough air flow for the pressure switch
 
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Old 01-01-12, 06:11 AM
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Measuring the pressure that the pressure switch sees is a start, but you can't conclude that the inducer motor is bad based on that observation alone.

What was the pressure you measured?

First, you need to check to be sure that the pressure tap on the inducer motor housing is not plugged or obstructed. Use a fine drill bit to be sure that the tap isn't obstructed by rust or other debris.

Remove the inducer motor assembly from the furnace and check to see if the fan wheel is deteriorated or plugged up. Check to see if the fan wheel turns freely in your hand or is hard to turn indicating that the motor bearings are failing, and if the motor looks like it is coming up to speed or overheating and failing to come up to speed.

Report back here on what you observe.
 
 

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