Lennox Split & Multi-Split

Lennox Split & Multi-Split Error Code F0

Split & Multi-Split

F0 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

  • Outdoor current overload sensed Note: (outdoor unit display --) two dashes
  • Programmable Wired Controller: Communication error between wired controller and indoor unit
  • Outdoor current overload protection

Causes & actions from Lennox

Outdoor current overload sensed Note: (outdoor unit display --) two dashes

10 models

3WMB036, M22A, M33A, M33B, MCFA, MCFB, MMDA, MMDB, MWMA, MWMB

Mini-split unit (indoor)

How it shows
  • corp1816 cassette ducted floor display: F0
  • corp1816 running light: 1 time
  • corp1816 timer light: ON
  • corp1816 wall indoor display: F0
  • Indoor receiver display: F0
  • mini outdoor fault display: --

Outdoor current overload sensed. Note: (outdoor unit display --) two dashes (Running Light: 1 time, Timer Light: ON)

Other manual wording

M22A, M33A, M33B, MCFA, MCFB, MMDA, MMDB

This manual entry does not list further causes or actions.

Applicable models & manual sources
  • MWMA

    Outdoor current overload sensed. Note: (outdoor unit display --) two dashes

    MWMA, MWMB, 3WMB036

    MWMA manual, page 9

  • M22A

    Outdoor current overload sensed Note: (outdoor unit display --) two dashes

    M22A, M33A, M33B

    M22A manual, page 27

  • M22A

    Outdoor current overload sensed Note: (outdoor unit display --) two dashes

    M22A, M33A, M33B, MMDA, MMDB, MCFA, MCFB

    M22A manual, page 10

Communication error between wired controller and indoor unit

Models: Programmable Wired Controller

Mini-split unit

How it shows
  • 507550 wired controller: F0

This manual entry does not list further causes or actions.

Applicable models & manual sources

Outdoor current overload protection

5 models

M22A, MCFA, MCFB, MFMA, MMDB

Mini-split unit (indoor)

How it shows
  • 507550 indoor display: F0

This manual entry does not list further causes or actions.

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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