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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
This is a cross-reference part that replaces multiple older Nordyne numbers commonly found in mobile home furnaces and residential HVAC systems
For technicians updating older systems
In the Lochinvar and A
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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