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Duotone terrace — saffron brief on the left, garden-folded ledger on the right.
Industrial-Grade Durability: Resists degradation from harsh environments and varying temperatures common in heavy-duty HVACR applications
or a visible loss of tension in the actuator assembly
verify the furnace’s technical data sheet to ensure this scroll matches the inducer assembly design
or "cherry-red" hotspots on the tube surface that cannot be brushed away
Always verify your specific MFR model number against the technical data sheet
Lennox 42J03 Limit Switch Industrial-Grade Durability: Resists degradation fromThe Lennox 42J03 Limit Switch is a critical safety component designed for precise thermal regulation within residential and commercial HVAC systems. This genuine OEM replacement part, also identified as part number 42J0301, features a fixed temperature range of 150 190F with an automatic reset function. As a veteran grade furnace high limit switch, it monitors the plenum temperature and breaks the electrical circuit to the gas valve if overheating is