Error code reference

Lennox Heat Pump Error Code Green ON / Red OFF

High pressure lockout (5 strikes)

High pressure lockout (5 strikes) — high pressure switch has tripped 5 times during a single Y1 demand.

First step from the service manual

Check system charge using approach & subcooling temperatures. Check system operating pressures and compare to unit charging charts.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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Green ON / Red OFF on my Lennox Heat Pump

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High pressure lockout (5 strikes) — high

From Service Manual 827849, p.21:

1.Check system charge using approach & subcooling temperatures. Check system operating pressures and compare to unit charging charts.

2.Measure door lock assembly resistance across the PTC terminals. Expected: ~200 ohms cold, rising sharply once energized.

3.Inspect strike and latch alignment. A warped door or misaligned strike prevents the switch stack from closing in the correct sequence.

Part W10810403

Door lock assembly

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