Furnace Pressure Switch Stuck Closed

This is not a repair.

Furnace pressure switch stuck closed.

Tapping lightly on the pressure switch body may open the switch and the unit may start. The contacts in the switch are either stuck together or moisture has entered the switched and seized it in the closed position. The pressure switch must be replaced. The source of pressure switch problems can sometimes be a pain to track down.

The 90 degree turns in the venting sometimes are calculated as 5 feet of piping. If you have exceeded the number of turns the furnace will not run right and the pressure switch will not work or stay closed. If your pressure switch is stuck it is most likely a problem in the running of the furnace. If is in the closed position the furnace stops the sequence and goes into lockout mode until the switch is open.

If you get a pressure switch code and the inducer will not come on remove one of the wires from the pressure switch. Which is why i made this video that go. When it thows a stuck pressure switch error you should check the voltage drop across it or disconnect it and ohm out. If it s truly stuck closed you need to replace the pressure switch.

It needs to be open until the draft inducer comes on. Pressure switch stuck closed. The leakage based on location could be a failed gasket or even the drain line connection. If the inducer comes on the pressure switch is stuck closed.

Furnace pressure switch troubleshooting. The plunger may not be pulling in completely and may only bob around when the pressure builds up inside the furnace. Nordyne furnace error code.