the 751P-MT-U-120 Control simplifies troubleshooting with clear LED diagnostic indicators—green for power status and red for low water conditions

automatically interrupting the circuit to the burners or heating elements if the supply plenum exceeds the 145°F threshold

Always verify the wiring diagram in the service manual to ensure the correct control point is being addressed

Will this transformer fix a furnace that cycles but blows cold air

Reznor 86979 Limit Switch R-410A the 751P-MT-U-120 Control simplifies troubleshootingThe Reznor 86979 Limit Switch is a critical safety component designed for precise thermal monitoring in Reznor unit heaters and commercial HVAC systems. This 115 135F AUTO limit switch functions as a high limit safety control, automatically interrupting the burner circuit if internal heat exchanger temperatures exceed the maximum set point of 135F. Engineered for durability, it features an automatic reset mechanism that restores operation once the