Lennox · EL18KSLV Series Outdoor Units
During cooling mode, there should be a 'W' signal present. If it's absent, it indicates a potential issue with the thermostat or unit wiring.
Click steps to track your progress.
Check the thermostat wiring to ensure it is correct.
Inspect the unit's wiring, especially connections related to the thermostat signal.
Verify the thermostat is functioning properly.