Furnace went out yesterday morning. Flashing LED code 31. Jumped the wires between connected to the pressure switch and the unit worked throughout the day. During the night, the furnace quit again and gives the same LED code 31. I replaced the pressure switch and it did not help. Any suggestions?
Could well be the inducer motor Google carrier 31fault code there are 3 video's on this on u tube
SOURCE: Carrier Weathermaker gas 8000 will not ignite
1. check indoor unit wiring.
2 check sensar of thermostate.
3if not change thermostate
SOURCE: Furnace Went Out! HELP PLEASE!!!!
The door closed or open should have no effect. The draft motor runs, no power to the glow plug or it is open,
The first place to look is at the furnace brain, a box located somewhere in the unit connecting to the gas valve, look at this brain [controller] and there should be a light of series of lights.
On the box itself there should be a matrix of codes such as: green light flashing= bad glow plug, or red, bad controller box, do you have anything like this?
Most have some sort of led light that narrows down the problem.
If not at least do these things:
make sure the power is off, and that the blower motor spins by hand freely.
next if you have a volt ohm meter, you can test the plug to see if there is a circuit, if the glow plug is open, that is one problem,
If you have a volt meter you can measure the leads at the plug to see if voltage is there or not.
There are so many checks and switches that will operate dependent on the operation of something else.
Unplug the furnace and keep the power off the brain, if so equipped for several minutes, see if it resets.
If it does great, if not tell me if there is a brain box and what the lights are, and what the matrix of light codes say, and we can go from there.
You can also measure for voltage from the thermostat to the furnace and make sure it is getting a signal on all wires, a thermostat wire could have come loose.
very difficult to troubleshoot a furnace when one is in front of it, let along without seeing it.
If you find no box, let me know, and let me know from these checks above if anything changes, or gives you more info to pass on to me.
Step at a time we can find this, a volt ohm meter will be really helpful.
Will
SOURCE: (HVAC) Furnace Not Igniting Quickly
Make sure a back draft in the flue is not happening. Wind can blow it out until the flue heats up. The flame sensor may not be close enough to the burner flame. It may be weak and need to be replaced or if its an optical one it may be dirty and not see the flame very well. Its not wasting much gas but it puts extra wear and tear on the gas controls, is noisy, and, as you said, blows cold drafty air. A gas control system that has issues of any kind is not real safe. It needs to get fixed.
SOURCE: furnace runs but won't ignite.
Error code 12 is blower on after power up. Meaning: after you turn on power to the furnace for aprox. 60-90 seconds the blower will run. The blower should then shut down and the furnace should go through the start up process, providing that the thermostat is set for and calling for heat. If the furnace fails to start after blower shut down there should be a new fault/error code. However if the blower continues to run longer then 90 seconds and continues with the same fault code more then likely the circuit board is bad. Please let me know if this was helpful and give me a rating. Good luck.
SOURCE: Carrier Weathermaker SXI Model 58SX8100LG Code 12
Code 12 I believe is power up after power off and a call for heat from the the thermostat. If you have a weak door switch that may be vibrating and going on and off it would cause this as would any thing that causes the power to drop low or out then reapply its self. try holding the door switch in while watching the board and after 2 or 3 minutes the furnace should go on to lite and the blower cycle off. If it stays in this mode try turning the thermostat off (heat - OFF -cool) and then push in the door switch nothing should happen except the lite on the board come on and stay on. If it does this than have someone turn the thermostat to heat and see if it starts or put the door on and set the heat and see if *** goes through the normal cycle of heating. If however it goes right back into the blower mode and shows the 12 code your problem is still with you. So next remove the wire on the "W" terminal on the board. Retry power to the door switch and now nothing should be on except the red lite. If it tries to start the 12 code and blower up again Im pretty sure you have a bad ignition/blower control board.
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