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Thank you all for contributing to the resolution of this problem and educating me along the way. The furnace is operational now. The final resolution to the problem was the replacement of the...

Gas is turned on; shares same line as water heater and another furnace. Checked for 24v on the MV and C connections; nothing (checked it before, during, and after inducer motor was running). ...

Thank you. I think there might have been some issues there because when I disconnected the vent from roof connection and blew on it using a blower, nothing happened at first, but later the motor...

I've checked the two wires on the pressure switch and connections look good. The hose seems to be OK as well. It's at eye level with pressure switch and there are no kinks in it. 31 still flashes....

Well, I checked sensor and it's free from any contact; however, I did find that the wire connected to it was loose, so I tightened it (must have come loose when I removed sensor to sand it down). ...

Thanks T-Top. Will check sensor. Am using natural gas. This is one of two furnaces in the house and the other is working fine...

Thanks... Made sure gas valve is in the ON position on gas line and furnace; all wires, including ground, are connected properly. Same symptoms; solid diagnostic light initially, fan comes on for 90...

OK. Here's the latest on my saga... Initial problem was error code 31 on my Briant 373LA horizontal furnace. After replacing pressure switch, burners fan would run for ~90 sec. the inducer, or what...

I was able to clear error code 21 by turning the gas valve off for 5 minutes and turning it back on. Error code 31 is now on display again. Pressure switch has been replaced. Any thoughts on what...

On my furnace, 3 Amp fuse is on the mother board, to the left of the diagnostic light. Good luck...

I've replaced the pressure switch. Fan comes on for 90 seconds then it sounds like the burners come on for about 10-15 seconds then furnace shuts down. Diagnostic code is now 21. Did I mis-wire...

Thank you for the prompt responses! I checked the door safety switch and it looks to be working properly. I replaced the fuse and diagnostic light is back on. 31 is still flashing. Checked...

I have a Bryant 373LAV/376CAV (not sure exactly which one) mounted horizontally in the attic that is <5 years old and has been functioning perfectly since installed. However, because Houston doesn't...