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ensuring the pressure switch hose is clear of obstructions and the inducer housing is pulling the rated vacuum is essential before installation
Common Questions: Can I use a 440V capacitor if my original was 370V
the internal thermal fuse or windings have likely failed
meaning it senses evaporator pressure at the valve outlet
An "OL" reading indicates an open winding
Lennox 88K90 Pressure Switch Els PW 17895 ensuring the pressure switch hoseThe Lennox 88K90 Pressure Switch is a high precision, OEM furnace safety component factory calibrated for induction monitoring in residential and light commercial heating systems. This 0. 47" WC pressure switch utilizes a single pole single throw (SPST), normally open contact configuration, ensuring the combustion process only initiates when proper draft is established. Designed for universal compatibility with older systems, the 88K90 replaces part