Carrier furnace code 31

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Old 02-19-11, 07:26 PM
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Carrier furnace code 31

Carrier furnace will blow but no heat. no clicking of ignitor. have had high winds. Model 58MXA08-12.
 
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Old 02-19-11, 08:03 PM
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your furnace manual is at:

http://www.xpedio.carrier.com/idc/gr.../58mxa-9sm.pdf



The Carrier 3-1 diagnostic code usually indicates that the pressure switch on the furnace isn't closing.


That usually means you have a problem with the venting system of the furnace being impaired in some way.


I presume that when the thermostat calls for heat the inducer motor above the burners tunrs on and comes up to speed?
 
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Old 02-19-11, 09:26 PM
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yes that's what happens. Have furnace manual, wasn't sure if code 31 was due to pressure switch failure, or some kind of lockout due to high winds causing ventilation problems.
 
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Old 02-20-11, 01:36 AM
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5% of the time the problem is the pressure switch.

95% of the time the problem is someplace in the venting system.
 
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Old 02-20-11, 04:17 AM
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Any way to reset this? Have turned off power, hoping that would reset the switch. Is a pressure switch a do it myself thing? I know we have to get the part from Carrier.
 
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Old 02-20-11, 08:28 AM
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As I noted, it's VERY unlikely the thew pressure switch is the problem. Instead, it's very likely that there is a defect in the venting system of the furnace.

Is the inducer motor starting and coming up to speed when the thermostat calls for heat?

Is ice, snow or anything plugging the plastic vent pipe?

You can remove the pipe for incoming fresh air at the furnace and check to see if a leaf or other debris is impairing the air flow.

Check to see if water is trapped in a dip in the plastic vent pipe.

Check to be sure that the drain for the furnace is not plugged up and preventing water from draining out of the furnace.
 
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Old 02-20-11, 12:53 PM
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thanks we'll try looking checking the vents and water
 
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