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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a trouble code 12 and 31, Since I turned it on this

Customer Question

I have a trouble code 12 and 31
JA: I'll do all I can to help. How long have you been dealing with this?
Customer: Since I turned it on this season
JA: Do you plan on doing the work yourself?
Customer: Yes, if at all possible
JA: Anything else we should know to help you best?
Customer: I have a Payne furnace manufactured in 2005
JA: Did you check the furnace's filters?
Customer: Yes, I put a new one in
Submitted: 2 months ago.
Category: HVAC
Expert:  Rick replied 2 months ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.

A 31 code is an open draft pressure switch. Is the draft fan running? is the exhaust completely clear of any obstructions?
A 12 code is unit powered up during a call for heat which would happen if you powered the unit down to try and reset it

Customer: replied 2 months ago.
What is the draft fan?
Customer: replied 2 months ago.
I prefer to text
Expert:  Rick replied 2 months ago.

This fan creates the draft that gets rid of the gas exhaust. It the small fan on the front of the unit. The exhaust vent begins at the draft fan.

Customer: replied 2 months ago.
No, it's not running
Expert:  Rick replied 2 months ago.

Do you have a multi-meter to test voltage?

Customer: replied 2 months ago.
I'll get it
Expert:  Rick replied 2 months ago.

Ok, once you have it check for 120 volts AC to the draft fan after you cycle the power off then back on again.

Customer: replied 2 months ago.
I cant find it
Expert:  Rick replied 2 months ago.

You can't find what?

Customer: replied 2 months ago.
The multi meter
Expert:  Rick replied 2 months ago.

Then you can't troubleshoot this any further. Most likely culprits are a bad fan (motor) or a bad control board. Since each of these is pretty expensive you need to be sure which is faulty. The only other thing you can do is check the electrical connections to the draft fan.

Customer: replied 2 months ago.
I'll find the multi meter and get back to you.
Expert:  Rick replied 2 months ago.

ok