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I'm running into 31 error code as well. Not sure if it's the…

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I'm running into 31 error...
I'm running into 31 error code as well. Not sure if it's the pressure switch or the blower fan. Sometimes (most times) the blower fan barely starts up and then then 31 code start flashing.
Submitted: 2 years ago.Category: HVAC
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Answered in 28 minutes by:
8/18/2015
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 24,393
Experience: 40+ yrs. experience as a licensed oil & gas technician.
Verified

If the draft fan doesn't run or doesn't get up to speed then you'll get this error and the pressure switch is doing its job. You could have a bad fan. Checking the voltage (should be 120 volts AC) to the fan after a re-start will confirm.

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Customer reply replied 2 years ago
Work has me swamped Rick, I probably won't be able to take your advise until next week. Hoping I'll be able to fix it up then!
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

Get back to me if you have more questions.

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