The most common reasons for replacing the switch are when.
Rheem water heater pressure switch stuck open.
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.
The furnace was loud and caused by the draft inducer.
This video provides step by step instructions for replacing the pressure switch on rheem furnaces.
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Came home to no heat.
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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.
This is fixed in my prior video.
The switch activates with air force pushing a plunger in the mechanism which closes the circuit.
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