HVAC Refrigeration Guide — Pressure Switch
Lennox Parts Field Guide
Lennox HVAC parts field guide for professional technicians — capacitors, contactor failures, condenser fan motors, control boards, and OEM part numbers. Stock smarter, diagnose faster.
- Tags: Capacitor, Condenser Fan Motor, Contactor, Control Board, Field Guide, HVAC, iComfort, Lennox, OEM Parts, Pressure Switch, Summer HVAC, Troubleshooting, XC16, XC20, XC21
The Pressure Switch Field Guide
Pressure switches are the most misdiagnosed component in HVACR service calls. This field guide covers how pressure switches work, the four real failure modes (diaphragm fatigue, condensate ingestion, hose deterioration, and contact failure), the correct diagnostic sequence, and brand-specific patterns for Cleveland Controls, Dwyer, Nordyne, and Daikin-McQuay equipment.

