Error code reference

Lennox Heat Pump Error Code DS2:SlowFlash / DS1:OFF

High pressure fault

High pressure fault — one strike counted toward lockout.

First step from the service manual

Check for restricted airflow, improper refrigerant charge, improper metering device, or incorrect sensor location/connection.

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

MyPros+ Max

$29/month · Cancel anytime · Or $9.95 3-day pass

M+

M+ Max·Lennox Heat Pump

DS2:SlowFlash / DS1:OFF on my Lennox Heat Pump

M+

High pressure fault — one strike counted toward

From Service Manual 840928, p.20:

1.Check for restricted airflow, improper refrigerant charge, improper metering device, or incorrect sensor location/connection.

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

78,000+ service manuals · 160,000+ error codes · 55+ brands

$29/month · Cancel anytime · Or $9.95 3-day pass