Carrier HH18HA199 Limit Switch 328140-751 often caused by a lost

often caused by a lost bulb charge or internal debris restricting the orifice

Industrial Build Quality: Zinc-plated steel enclosure and silicone diaphragm withstand temperature extremes from -40°F to 180°F

While the 19 series can be used for air/gas

Is the A6942 direct or reverse acting

it is a reliable choice for millivolt applications and standard residential multi-stage setups

Carrier HH18HA199 Limit Switch 328140-751 often caused by a lostThe Carrier HH18HA199 Limit Switch is a critical safety component designed for high temperature monitoring in HVAC induction combustion furnaces and residential heating systems. This genuine OEM replacement part is calibrated to trigger at a fixed 200 degree opening temperature, automatically interrupting the electrical circuit via its SPST (Single Pole Single Throw) configuration to prevent heat exchanger damage or hazardous rollout conditions.