and system lockouts

Technicians typically utilize this Robertshaw 5501-378 for its robust mechanical design and consistent heating element power control

it is suitable for steam

Durable Construction: Engineered to withstand the high ambient temperatures found in HVACR burner compartments

The LED will flash a specific pattern indicating the failure mode

Carrier HH18HV145 Limit Switch 328140-751 and system lockoutsThe Carrier HH18HV145 is a high precision HVAC auto limit switch engineered to maintain safe operating temperatures within gas and electric furnaces. Operating with a 115 145F temperature range, this genuine OEM replacement part acts as a critical safety barrier, automatically interrupting the circuit to the burners or heating elements if the supply plenum exceeds the 145F threshold. This auto reset limit switch is designed for demanding industrial