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Error 31 indicates the pressure switch is not closing. Does the small inducer vent motor come on?
That is the small motor where vent attaches to furnace.It has to pull a vacuum on the pressure switch.Will lok similar to the one in piture
This small motor.Turn power off to furnace to rest board then back on and tell me if this small motor is coming on
That little motor has to run for furnace to work. Might be hard to tell , but if furnace is running, that motor has to be.Lets watch and see if it fails again
Yes that switch turns power off and on.
When you turn power off and on it resets the control board in furnace.
On call for heat, that small motor I am referring to (Not circulating blower) must come on and stay on the entire heating cycle, closing and holding closed by vacuum the pressure switch.If that small motor does not run or stops, pressure switch will open and burners will not light or will go out.
Let me verify.You are saying that small vent motor does not run or stay running correct?
OK our next step is to (using a volt meter), determine if we are losing power to that small motor.If we are losing power to the motor we need to determine why. If not losing power to motor, but it is not running,then motor will need to be replaced.
Without a meter will be hard to troubleshoot.We can troubleshoot here many times and save you some money.Problem is I depend on you to be my hands and eyes and provide necessary tools and test equipment.For me to troubleshoot without you having a meter would be compared to a tech showing up at your house without his tools and test equipment. The very best he could do would be to guess at the problem.
You can get an inexpensive one at Walmart for about 15 bucks if you would like to troubleshoot and I would be happy to guide you.