Lennox Split & Multi-Split

Lennox Error Code FP

Split & Multi-Split

FP means different things on different Split & Multi-Split models. Enter your model number to see only your reading, or find your model below.

What It Means

  • Heating in room temperature under 8°C.
  • MWCB, MWHB: 46F heat mode (available on heat pump systems only)
  • MLA, MPA, MPB: Freeze protection. The silence (FP) button was pushed and held for more than three seconds. Temperature will hold at 46°F until returned to normal operation.

Causes & actions from Lennox

Heating in room temperature under 8°C.

8 models

3WMC, M22A, M33C, MCFA, MCFB, MFMA, MMDB, MWMC

Mini-split unit (indoor)

How it shows
  • 507550 indoor display: FP

This manual entry does not list further causes or actions.

Applicable models & manual sources

46F heat mode (available on heat pump systems only)

Models: MWCB, MWHB

Mini-split unit (indoor)

How it shows
  • 508242 indoor display: FP

This manual entry does not list further causes or actions.

Applicable models & manual sources

Freeze protection. The silence (FP) button was pushed and held for more than three seconds. Temperature will hold at 46°F until returned to normal operation.

Models: MLA, MPA, MPB

Mini-split unit (outdoor)

How it shows
  • corp1816 multizone outdoor display: FP

This manual entry does not list further causes or actions.

Applicable models & manual sources
  • MPA

    Freeze protection. The silence (FP) button was pushed and held for more than three seconds. Temperature will hold at 46°F until returned to normal operation.

    MPA, MPB, MLA

    MPA manual, page 5

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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