Lennox 93M05 Crankcase Heater 320734-701 the 71K11 ensures the inducer

the 71K11 ensures the inducer motor has established correct airflow before allowing the ignition sequence to proceed

The White-Rodgers F811-0514 ComfortPro EAC Collecting Cell is a heavy-duty electronic air cleaner replacement cell designed for high-efficiency particulate capture in residential and commercial HVAC systems

or "open pressure switch" fault codes on the control board

As a high-accuracy thermistor

What is the difference between the MR212E and standard regulators

Lennox 93M05 Crankcase Heater 320734-701 the 71K11 ensures the inducerThe Lennox 93M05 Crankcase Heater is a critical OEM component designed to prevent refrigerant migration and oil foaming in HVACR compressors during the off cycle. This belt type compressor heater provides a constant 40 watts of thermal energy at 240 volts, maintaining the lubricant at a temperature higher than the coldest part of the system. Engineered for adaptability, the 93M05 fits compressor housings with a 7" to 8" diameter (adjustable range