This genuine Lennox OEM part is engineered to break the electrical circuit to the blower motor and control board immediately upon the removal of the service panel

Standardized Sizing: 3/8" flare to 1/4" male pipe configuration fits standard manifolds and charging ports

Combustion Motor Scroll

clogged filters

verifying airflow across the heat exchanger and checking for a restricted filter is essential before installing this automatic reset limit switch

Trane CNT1220 Limit Switch This genuine Lennox OEM partThe Trane CNT1220 (officially updated to CNT01220) is a high limit thermal safety control engineered for precise HVAC over temperature protection. Designed as a direct OEM replacement part, this 160F auto limit switch monitors the supply plenum temperature to prevent heat exchanger damage or unsafe operating conditions. Utilizing a normally closed SPST (Single Pole Single Throw) contact configuration, it interrupts the gas valve or heating circuit