Lennox Split & Multi-Split

Lennox Split & Multi-Split Error Code --

Split & Multi-Split

-- 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

  • Mode conflict for multi-zone systems
  • 3WMB036, MWMA, MWMB: Mode conflict
  • MLA, MPA, MPB: Multi zone mode conflict - - (dash dash) indoor display or operation lamp Flashes 6 times, timer lamp Flashing, - - display
  • MLA, MPA, MPB: Outdoor unit - standby mode for single zone. The LED displays “- -”

Causes & actions from Lennox

Mode conflict for multi-zone systems

8 models

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

Mini-split unit (indoor)

How it shows
  • 507550 indoor display: --

This manual entry does not list further causes or actions.

Applicable models & manual sources

Mode conflict

Models: 3WMB036, MWMA, MWMB

Mini-split unit (indoor)

How it shows
  • corp1816 running light: 6 times
  • corp1816 timer light: Flash
  • corp1816 wall indoor display: --

Mode conflict (Running Light: 6 times, Timer Light: Flash)

Applicable models & manual sources

Multi zone mode conflict - - (dash dash) indoor display or operation lamp Flashes 6 times, timer lamp Flashing, - - display

Models: MLA, MPA, MPB

Mini-split unit (outdoor)

How it shows
  • corp1816 multizone outdoor display: --

This manual entry does not list further causes or actions.

Applicable models & manual sources
  • MPA

    Multi zone mode conflict - - (dash dash) indoor display or operation lamp Flashes 6 times, timer lamp Flashing, - - display

    MPA, MPB, MLA

    MPA manual, page 5

Outdoor unit - standby mode for single zone. The LED displays “- -”

Models: MLA, MPA, MPB

Mini-split unit (outdoor)

How it shows
  • corp1816 multizone outdoor display: --

This manual entry does not list further causes or actions.

Applicable models & manual sources
  • MPA

    Outdoor unit - standby mode for single zone. The LED displays “- -”

    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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