Trane SWT2978 Pressure Switch 318820-201 providing the exact BTU input

providing the exact BTU input needed to energize the thermocouple or flame sensor

The Lennox 44W54 Collector Box is a precision-engineered OEM replacement part (Model 102109-01) designed for high-efficiency furnace combustion systems

or a visible loss of tension in the actuator assembly

Check for a clogged HVAC air filter

and compatible gases

Trane SWT2978 Pressure Switch 318820-201 providing the exact BTU inputThe Trane SWT2978 is a heavy duty dual pressure switch engineered for precision safety monitoring within residential and commercial HVAC units. This OEM replacement part is built to monitor critical pressure thresholds, providing a vital safeguard for the compressor and combustion blower. Operating on a 24V AC power supply with an 18A current rating and 28VA pilot duty, it ensures reliable electrical signaling to prevent system strain during high or