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Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 21988
Experience:  40+ yrs. experience as a licensed oil & gas technician.
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I'm running into 31 error code as well. Not sure if it's the

Customer Question

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
Expert:  Rick replied 2 years ago.

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.

Customer: 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!
Expert:  Rick replied 2 years ago.

Get back to me if you have more questions.