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Why is my Lennox furnace showing a pressure switch open code
specifically optimized for high-pressure R410A systems and standard liquid line applications
Robust SPST Construction: Engineered for high-duty cycles in the burner compartment
the 67K65 and 67K6501 are functionally identical
Trane SEN1951 Flame Sensor 320788-702 Why is my Lennox furnaceThe Trane SEN1951 Flame Sensor (also identified as SEN01951) is a critical OEM replacement part engineered to maintain precise flame rectification within residential and commercial furnace burners. This furnace flame sensor operates by detecting the presence of a microamp signal generated during combustion. If the HVAC control board fails to receive this signal, it immediately terminates the gas valve cycle to prevent hazardous gas accumulation.
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