Error code reference
Lennox Air Conditioner Error Code 5
Pressure switch opens after compressor has run for more than two minutes, may indicate improper charge or…
Pressure switch opens after compressor has run for more than two minutes, may indicate improper charge or coil obstruction.
First step from the service manual
Check for low system charge; check for improper charge or coil obstruction.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
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- Step-by-step tests with expected resistance, voltage, and continuity values
- Wiring diagram references and connector pinouts from the OEM service manual
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