The purpose of a pressure switch is to prevent a furnace from running when there is an abnormal condition within the furnace system. When a furnace provides a PSW code, most technicians will replace the PSW, because it’s the least expensive item on the furnace. However, a PSW should not be replaced until it has been tested.
Bad Practices
Installing an adjustable pressure switch in a unit and adjusting it to a set point that allows the furnace to come on is unsafe and will void the manufacturer's warranty.
A snubber (see item 1 below - click to enlarge) is used to prevent the pulsing of the PSW upon the ignition of the burners. If the snubber is removed, it will cause more PSW codes.
Testing Methods
There are multiple ways to test a PSW.
**Remember when there is a PSW code it’s usually an indicator that there is a problem somewhere else other than a defective switch.
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