OEM Lennox High Pressure Switch — 86H31

The genuine OEM Lennox 86H31 high pressure switch is a critical safety control that monitors refrigerant pressure on the discharge side of your compressor. When system pressure climbs above the safe operating threshold — often from a dirty condenser coil, a failing condenser fan, or a refrigerant overcharge — this switch opens the control circuit and shuts down the compressor to prevent catastrophic damage. It is designed to the exact cut-out and reset specifications required by your Lennox equipment.

Common failure symptoms: Recurring nuisance trips and short-cycling, a compressor that won't start, tripped safety lockouts on the control board, or a switch that fails to reset after pressure normalizes. A worn or contact-fatigued switch may open at the wrong pressure or fail to open at all, leaving your system unprotected.

Why OEM matters: Lennox systems are engineered around precise pressure trip points. Using the OEM 86H31 guarantees the correct cut-out pressure, reset differential, and electrical rating so your safety circuit performs exactly as the factory intended. Aftermarket substitutes with different setpoints can allow damaging overpressure or cause chronic false trips. Protect your compressor investment with the genuine Lennox part.