Lennox Packaged Unit

Lennox Error Code Solid Blue

Packaged Unit: Packaged HVAC (outdoor)

What It Means

  • Controller still in boot-up state (check7-segment LED) or app is already connected.

Causes & actions from Lennox

How it shows
  • core w4 pair led: Solid Blue

Controller still in boot-up state (check 7-segment LED) or app is already connected.

Applicable models & manual sources
  • LCM156U

    Controller still in boot-up state (check7-segment LED) or app is already connected.

    LCM156U, LCM180U, LCM210U, LCM240U, LCM300U, LGM/LCM156U, LGM/LCM180U, LGM/LCM210U, LGM/LCM240U, LGM/LCM300U, LGM156U, LGM180U, LGM210U, LGM240U, LGM300U

    LCM156U manual, page 15

  • LDT078

    Controller still in boot-up state (check7-segment LED) or app is already connected.

    LDT078, LDT092, LDT102, LDT120, LDT152, LHT/LDT078, LHT/LDT092, LHT/LDT102, LHT/LDT120, LHT/LDT152, LHT078, LHT092, LHT102, LHT120, LHT152

    LDT078 manual, page 17

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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