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frequent "Open Pressure Switch" errors are usually symptomatic of a restricted vent
the AFS-405-121 is equipped with gold-clad SPDT contacts
provided the spring is not under full tension
Technicians should have a calibrated manometer
Industrial Grade Protection: Features automatic thermal overload protection to prevent winding failure during high-ambient operations
Armstrong Furnace R45408-001 Wire Harness 321042-401 frequent "Open Pressure Switch" errorsThe Armstrong Furnace R45408 001 Wire Harness is a critical OEM replacement component designed to ensure precise electrical connectivity and signal transmission within your heating system. Engineered for high temperature resilience and long term durability, this HVAC wire harness assembly facilitates seamless communication between the furnace control board and peripheral sensors. As a genuine Lennox Armstrong repair part, it eliminates the risks
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