What It Means
- High or low voltage protection - outdoor display E5
- High or Low voltage protection
- MLA, MPA, MPB: High pressure protection
- High pressure switch open
Lennox Split & Multi-Split
Lennox Error Code P1
Split & Multi-Split
P1 means different things on different Split & Multi-Split models. Enter your model number to see only your reading, or find your model below.
Causes & actions from Lennox
High or low voltage protection - outdoor display E5
10 models
3WMB036, M22A, M33A, M33B, MCFA, MCFB, MMDA, MMDB, MWMA, MWMB
Mini-split unit (indoor)
How it shows
- corp1816 cassette ducted floor display: P1
- corp1816 running light: 2 times
- corp1816 timer light: Flash
- corp1816 wall indoor display: P1
- Indoor receiver display: P1
- mini outdoor fault display: E5
High or low voltage protection - outdoor display E5 (Running Light: 2 times, Timer Light: Flash)
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
High or low voltage protection - outdoor display E5
MWMA, MWMB, 3WMB036
- M22A
High or low voltage protection - outdoor display E5
M22A, M33A, M33B, MMDA, MMDB, MCFA, MCFB
- M22A
High or low voltage protection - outdoor display E5
M22A, M33A, M33B
High or Low voltage protection
5 models
M22A, MCFA, MCFB, MFMA, MMDB
Mini-split unit (indoor)
How it shows
- 507550 indoor display: P1
This manual entry does not list further causes or actions.
Applicable models & manual sources
- M22A
High or Low voltage protection
M22A, MMDB, MCFA, MCFB, MFMA
High pressure protection
Models: MLA, MPA, MPB
Mini-split unit (outdoor)
How it shows
- corp1816 multizone outdoor display: P1
- corp1816 new indoor error: P6
This manual entry does not list further causes or actions.
Applicable models & manual sources
- MPA
High pressure protection
MPA, MPB, MLA
High pressure switch open
10 models
3WMB036, M22A, M33A, M33B, MCFA, MCFB, MMDA, MMDB, MWMA, MWMB
Mini-split unit (indoor)
How it shows
- corp1816 old indoor display: P1
This manual entry does not list further causes or actions.
Applicable models & manual sources
- MWMA
High pressure switch open
MWMA, MWMB, 3WMB036, M22A, M33A, M33B, MMDA, MMDB, MCFA, MCFB
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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