Lennox Split & Multi-Split

Lennox Error Code nF

Split & Multi-Split: Mini-split unit (indoor)

What It Means

  • Filter replacement reminder (power on display for 15 seconds).

Causes & actions from Lennox

How it shows
  • 507550 indoor display: nF

This manual entry does not list further causes or actions.

Applicable models & manual sources
  • M22A

    Filter replacement reminder (power on display for 15 seconds).

    M22A, MMDB, MCFA, MCFB, MFMA

    M22A manual, page 7

  • M33C

    Filter replacement reminder (power on display for 15 seconds).

    M33C, MWMC, 3WMC

    M33C manual, page 7

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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