OEM Lennox High Pressure Switch — 10M85

The genuine OEM Lennox 10M85 high pressure switch is a critical safety control that monitors refrigerant pressure on the high side of your Lennox air conditioner or heat pump. When discharge pressure climbs to an unsafe level, the switch opens the circuit and shuts down the compressor — protecting it from catastrophic damage caused by overpressure conditions.

When this switch fails or trips repeatedly, you may experience a compressor that starts and then quickly cuts out, a system that won't cool, or a unit that locks out on a safety fault. A dirty condenser coil, blocked airflow, or overcharge can trigger it, but a defective switch itself can also cause nuisance trips or fail to protect the compressor when it should. Faulty operation should be diagnosed and the switch replaced promptly.

Fitting the OEM Lennox 10M85 guarantees the exact cut-out and reset pressure setpoints Lennox engineered for your equipment. Aftermarket switches with incorrect trip points can leave the compressor unprotected or cause needless shutdowns. Safeguard your investment with a genuine factory pressure switch built to Lennox specifications.