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Check for 120V at the coil terminals while the system is calling
Smith 100188878 Fan Assembly is a critical OEM replacement component engineered specifically for the FTX500 series high-efficiency boilers
By managing the gas valve sequence and monitoring flame rectification
The spring return fail-safe ensures the valve returns to the closed position during power loss
The York S1-9951-1801 Orifice is a precision-engineered fixed bore metering device designed for specific residential and light commercial HVAC applications
Lennox 12L20 Pressure Switch 318973-401 Check for 120V at theThe Lennox 12L20 Pressure Switch is a critical OEM HVAC safety control designed to protect the compressor and refrigeration circuit from catastrophic failure. As a 590 PSI high pressure switch, it operates on a Normally Closed (N C) logic, meaning the internal contacts are closed during standard operation and snap open to kill the control circuit when discharge pressure exceeds the factory setpoint. This Lennox replacement part ensures the system
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