Lennox Split & Multi-Split

Lennox Error Code E481

Split & Multi-Split: Heat pump (outdoor)

What It Means

  • Discharge pressure transducer fault. Discharge pressures sensor signal is out of range. The signal should be between 0.5 and 4.5 Vdc between Blue and Black. The error code will be cleared when the proper signal is provided to the control. Injection will be disabled, heating and cooling demands will still be serviced.

Causes & actions from Lennox

How it shows
  • Outdoor control 7-segment display: E481

Discharge pressure transducer fault. Discharge pressures sensor signal is out of range. The signal should be between 0.5 and 4.5 Vdc between Blue and Black. The error code will be cleared when the proper signal is provided to the control. Injection will be disabled, heating and cooling demands will still be serviced.

Applicable models & manual sources
  • SL22KLV

    Discharge pressure transducer fault. Discharge pressures sensor signal is out of range. The signal should be between 0.5 and 4.5 Vdc between Blue and Black. The error code will be cleared when the proper signal is provided to the control. Injection will be disabled, heating and cooling demands will still be serviced.

    SL22KLV, SL22KLV-024, SL22KLV-036, SL22KLV-048, SL22KLV-060

    SL22KLV manual, page 36

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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