The Williams P151800 Gasket is a critical OEM replacement component engineered for high-performance sealing within Williams Forsaire Direct Vent wall furnaces

7-watt power rating provides the necessary electromagnetic force for reliable plunger seating and valve opening

preventing energy waste and protecting downstream equipment from condensate backup

Verify that you have 24VAC at the power input and check for proper grounding

this switch ensures that your HVAC system remains protected without requiring a manual reset for minor ambient temperature fluctuations once the rollout condition is cleared

Lennox 73K17 Limit Switch 322838-754 The Williams P151800 Gasket isAs an HVAC technician, you know that a failed limit switch is a primary cause for furnace short cycling and overheating. The Lennox 73K17 is a genuine OEM limit switch designed specifically for Lennox, Allied, Armstrong, and Ducane heating units. This SPST normally closed high limit control features a 7 inch insertion length, making it compatible with various air handlers and furnaces, such as the G23Q5 6 series. It operates as an auto reset limit