0 ohms or an open line (OL) in the wrong state indicates a failure

Ensure you select the correct voltage for your specific control circuit

OEM Compatibility: Guaranteed fit for Carrier 50HJ series units

Can the MA-318-500 be mounted vertically

For contractors looking to improve fresh air ventilation without complex programming

Carrier HH18HA201 Limit Switch 320788-702 0 ohms or an openThe Carrier HH18HA201 Limit Switch is a critical safety component designed for precise thermal monitoring within furnace heat exchangers and air handlers. Engineered as a 160 degree furnace limit switch, this L160 40 thermally actuated control prevents equipment overheating by breaking the electrical circuit when the internal temperature exceeds the 160F fixed setpoint. It features a 40F differential, ensuring the system resets once temperatures