Lennox Ducted Heating

Lennox Ducted Heating Error Code E402

Ducted Heating:

What It Means

  • LSOM - Outdoor unit system pressure trip.

Causes & actions from Lennox

How it shows
  • Integrated control 7-segment display: E402

Compressor ran over 18 hours in air conditioning mode.

Other manual wording

SL297UHNV

Discharge or suction pressure out-of-limits, or compressor over- loaded. Clears the error after 4 consecutive normal compressor run cycles.

Applicable models & manual sources
Disclaimer: This information is for general reference. Code wording and instructions vary by model. Always follow the service manual for your exact unit.

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