Carrier HH18HA147 Limit Switch L99H008 Whether you are performing a

Whether you are performing a direct replacement or a new install

providing a direct-fit solution for commercial unit heater repair

cutting off power to the gas valve until the unit cools to its 150°F reset point

Engineered for field technicians who require a rigid

If the switch remains open (infinite resistance) despite verified suction from the motor

Carrier HH18HA147 Limit Switch L99H008 Whether you are performing aThe Carrier HH18HA147 Limit Switch is a critical safety component designed for precise thermal monitoring within furnace heat exchangers and air handlers. Engineered as a high limit protection device, this switch is a direct replacement for HH18HA147A and functions by opening the electrical circuit if internal plenum temperatures exceed safe operating parameters. This prevents thermal stress on the heat exchanger and ensures the system operates within