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the unit is the specified direct replacement for L-303-2 and the legacy RTS451
but the primary venting cause should also be addressed
Turning the adjustment screw clockwise increases the setpoint
The Resideo 392451-1 ECO Adapter is a critical component for technicians servicing millivolt gas valves and pilot safety circuits
The Heil Quaker ICP 1160250 O'Ring is a critical HVAC replacement part designed for high-performance sealing in residential furnace units
Lennox 20J83 Limit Switch the unit is the specifiedThe Lennox 20J83 Limit Switch (Model 20J8301) is an essential HVAC OEM replacement part engineered for precise thermal management in high efficiency furnaces. This single pole, single throw (SPST) automatic control is factory calibrated to actuate at 165F, effectively breaking the circuit to prevent heat exchanger damage or unsafe operating conditions. Once the plenum temperature cools to 135F, the switch automatically resets, restoring normal system
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