Lennox Split & Multi-Split

Lennox Error Code P6

Split & Multi-Split

P6 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
  • High pressure switch open
  • High pressure switch open Low pressure switch open
  • Inverter module (IPM) error.
  • MLA, MPA, MPB: Inverter module (IPM) malfunction
  • Low pressure switch open
  • 3WMB036, MWMA, MWMB: Multi-Zone compressor highor low-pressure switch open - outdoor unit display P2

Causes & actions from Lennox

Mode conflict

7 models

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

Mini-split unit (indoor)

How it shows
  • corp1816 cassette ducted floor display: P6
  • corp1816 running light: 7 times
  • corp1816 timer light: Flash
  • Indoor receiver display: P6

This manual entry does not list further causes or actions.

Applicable models & manual sources

High pressure switch open

5 models

M22A, MCFA, MCFB, MFMA, MMDB

Mini-split unit (indoor)

How it shows
  • 507550 indoor display: P6

This manual entry does not list further causes or actions.

Applicable models & manual sources

High pressure switch open Low pressure switch open

5 models

M22A, MCFA, MCFB, MFMA, MMDB

Mini-split unit (indoor)

How it shows
  • 507550 indoor display: P6

This manual entry does not list further causes or actions.

Applicable models & manual sources
  • M22A

    High pressure switch open Low pressure switch open

    M22A, MMDB, MCFA, MCFB, MFMA

    M22A manual, page 8

Inverter module (IPM) error.

10 models

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

Mini-split unit (indoor)

How it shows
  • corp1816 old indoor display: P6

This manual entry does not list further causes or actions.

Applicable models & manual sources
  • MWMA

    Inverter module (IPM) error.

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

    MWMA manual, page 6

Inverter module (IPM) malfunction

Models: MLA, MPA, MPB

Mini-split unit (outdoor)

How it shows
  • corp1816 multizone outdoor display: P6
  • corp1816 new indoor error: P0

This manual entry does not list further causes or actions.

Applicable models & manual sources

Low pressure switch open

5 models

M22A, MCFA, MCFB, MFMA, MMDB

Mini-split unit (indoor)

How it shows
  • 507550 indoor display: P6

This manual entry does not list further causes or actions.

Applicable models & manual sources

Multi-Zone compressor highor low-pressure switch open - outdoor unit display P2

Models: 3WMB036, MWMA, MWMB

Mini-split unit (indoor)

How it shows
  • corp1816 running light: 7 times
  • corp1816 timer light: Flash
  • corp1816 wall indoor display: P6

Multi-Zone compressor high- or low-pressure switch open - outdoor unit display P2 (Running Light: 7 times, Timer Light: Flash)

Applicable models & manual sources
  • MWMA

    Multi-Zone compressor high- or low-pressure switch open - outdoor unit display P2

    MWMA, MWMB, 3WMB036

    MWMA manual, page 9

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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