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Use an ohmmeter to check if the pressure switch is opening or closing properly when heat is called for. First, turn the power of the furnace off. Next, take off one of the power hoses and blow on it. Now use the ohmmeter to check whether the pressure switch is functioning properly.What should I do if my pressure switch is stuck?
If your pressure switch is stuck, it is most likely a problem in the running of the furnace. The plunger may not be pulling in completely and may only bob around when the pressure builds up inside the furnace. Using a cloth and a wire brush, remove any blockages and dirt from the secondary exchanger and the inducer.What is a furnace pressure switch?
A furnace pressure switch is a safety device located near the draft inducer motor of a gas forced-air furnace. It is a round-shaped switch that is fairly easy to identify once you have removed your furnace's front cover.How do you test a pressure switch on a gas heater?
To see if the switch is working right, you can check it for voltage with a power meter or multi-meter. You can also temporarily bypass the pressure switch by using a jumper wire to make good contact with both terminals on the switch. If the switch is the problem, bypassing it should allow your heater to start running.