As a staple for service contractors

Always cycle the heating equipment several times after installation to verify the proving sequence

a different sleeve and nut size is required

ensuring the safety pilot stays energized under consistent thermal load

Lennox 11K39 Temperature Sensor L99H008 As a staple for serviceThe Lennox 11K39 Temperature Sensor is a precision Lennox thermal thermistor engineered for direct integration with Lennox HVAC and refrigeration control boards. This HVAC discharge air sensor provides critical real time resistance data, allowing the system to modulate compressor staging and fan cycles based on precise thermal atmospheric conditions. Designed to eliminate the drift common in aftermarket components, this Lennox OEM replacement sensor