Furnace Pressure Switch Stuck Open

Pressure switch stuck open replaced pressure switch still getting 3 flashes wich means pressure switch stuck open. If you get a pressure switch code and the inducer will not come on remove one of the wires from the pressure switch. 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.

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Tapping lightly on the pressure switch body may open the switch and the unit may start.

Furnace pressure switch stuck open.

Replaced circuit board white rodgers 50a50 241 inducer motor comes on then get 3 fl read more. The contacts in the switch are either stuck together or moisture has entered the switched and seized it in the closed position. Pushing in the plunger closes the circuit to activate the blower motor so if the switch is stuck in the open position that means the motor will not run. This is not a repair.

The pressure switch must be replaced. If the inducer comes on the pressure switch is stuck closed. The pressure switch on a furnace may fail or get stuck in an open position and there are few simple checks you can complete before testing the switch. This is fixed in my prior video.

Also noticed the control board was blinking red. The pressure switch works with a small plunger that pushes in and out. A pressure switch is designed to sense the negative pressure created by the draft inducer motor during the furnace startup and to shut down the furnace ignition if the air pressure is inadequate. The furnace was loud and caused by the draft inducer.

Came home to no heat.

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