OEM Lennox High Pressure Switch — 13R26

The genuine OEM Lennox 13R26 high pressure switch is a critical safety control that monitors refrigerant discharge pressure in your Lennox air conditioner or heat pump. When system pressure climbs past its factory-calibrated trip point, the switch opens the control circuit and shuts down the compressor before dangerous pressures can cause damage.

Common symptoms of a bad high pressure switch include a compressor that trips off on hot days, nuisance lockouts, no cooling, or a unit that repeatedly cycles and displays a high-pressure fault code. A switch stuck open prevents the system from running at all, while one that won't trip removes vital compressor protection.

OEM matters here because the 13R26 is calibrated to the exact cut-out and reset pressures Lennox engineered for this equipment. An aftermarket switch with the wrong setpoints can allow compressor-damaging pressures or cause constant false trips. This factory-spec replacement restores accurate protection and reliable, safe operation.