the HH84AA021 is the official OEM equivalent and provides the same form

Known among technicians by its model number LF777M1-20-1

What are the symptoms of a failing flue temperature sensor

Serviceable Construction: All-bronze body and union solder x NPT connections allow for easier maintenance and component replacement in tight mechanical rooms

providing a reliable interface for modern HVACR control systems

Carrier LH660011 Control Board Els PW 17895 the HH84AA021 is the officialThe Carrier LH660011 Ignition Control Board is a critical OEM replacement engineered for precise sequence management in Carrier furnace ignition systems. As a primary 24V HVAC control module, this board regulates gas valve timing, spark ignition, and flame sensing to ensure reliable combustion cycles and system safety. Designed to support both 50Hz and 60Hz frequencies, the LH660011 integrates seamlessly into the Carrier PG8HAA series and other