Replacing the Pressure Switch. This prevents the furnace from running with blocked vents or a failing blower, which could lead to dangerous carbon monoxide buildup.
Understanding Furnace Short Cycling Caused by a Faulty Pressure Switch
To check for blockages, inspect the vent pipe running to the exterior of your home. Touch the probes to the two terminals on the switch.
First, disconnect the two wires connected to the switch terminals. Locate the switch, which is usually a small, rectangular device with electrical wires connected to the back and a rubber or plastic tubing connecting to the inducer motor housing.
Troubleshooting Short Cycling Caused by Furnace Pressure Switch Issues
Also, examine the venting outside your home to ensure it is not clogged with snow, leaves, or bird nests, which can create excessive backpressure. Check the tubing for cracks, holes, or disconnections, as a leak here is a common cause of false pressure switch failures.
More About How to check a furnace pressure switch
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