Furnace Pressure Switch Stuck Closed

If it s truly stuck closed you need to replace the pressure switch.

Furnace pressure switch stuck closed.

If the inducer comes on the pressure switch is stuck closed. If your pressure switch is stuck it is most likely a problem in the running of the furnace. Pressure switch stuck closed. If you have exceeded the number of turns the furnace will not run right and the pressure switch will not work or stay closed.

The pressure switch must be replaced. If you get a pressure switch code and the inducer will not come on remove one of the wires from the pressure switch. This is not a repair. If the allowed vent feet are exceeded then you will have trouble with the pressure switch not staying closed.

If is in the closed position the furnace stops the sequence and goes into lockout mode until the switch is open. When it thows a stuck pressure switch error you should check the voltage drop across it or disconnect it and ohm out. The plunger may not be pulling in completely and may only bob around when the pressure builds up inside the furnace. Pressure switch fails closed normally this would indicate a failed pressure switch the furnace will test to make sure the switch is open before starting the ventor motor.

Which is why i made this video that go. It needs to be open until the draft inducer comes on. Furnace pressure switch troubleshooting. The leakage based on location could be a failed gasket or even the drain line connection.

Using a cloth and a wire brush remove any blockages and dirt from the secondary exchanger and the inducer. The 90 degree turns in the venting sometimes are calculated as 5 feet of piping. The source of pressure switch problems can sometimes be a pain to track down.