What It Means
- Outdoor unit EEPROM error - outdoor display E0
- Indoor unit #4 coil outlet temperature sensor error.
- MLA, MPA, MPB: No. D Indoor unit coil outlet temperature sensor malfunction
- Outdoor unit EEPROM error
Lennox Split & Multi-Split
Lennox Error Code F4
Split & Multi-Split
F4 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
Outdoor unit EEPROM error - outdoor display E0
10 models
3WMB036, M22A, M33A, M33B, MCFA, MCFB, MMDA, MMDB, MWMA, MWMB
Mini-split unit (indoor)
How it shows
- corp1816 cassette ducted floor display: F4
- corp1816 running light: 5 times
- corp1816 timer light: ON
- corp1816 wall indoor display: F4
- Indoor receiver display: F4
- mini outdoor fault display: E0
Outdoor unit EEPROM error - outdoor display E0 (Running Light: 5 times, 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 unit EEPROM error - outdoor display E0
MWMA, MWMB, 3WMB036
- M22A
Outdoor unit EEPROM error - outdoor display E0
M22A, M33A, M33B, MMDA, MMDB, MCFA, MCFB
- M22A
Outdoor unit EEPROM error - outdoor display E0
M22A, M33A, M33B
Indoor unit #4 coil outlet temperature sensor error.
10 models
3WMB036, M22A, M33A, M33B, MCFA, MCFB, MMDA, MMDB, MWMA, MWMB
Mini-split unit (indoor)
How it shows
- corp1816 old indoor display: F4
This manual entry does not list further causes or actions.
Applicable models & manual sources
- MWMA
Indoor unit #4 coil outlet temperature sensor error.
MWMA, MWMB, 3WMB036, M22A, M33A, M33B, MMDA, MMDB, MCFA, MCFB
No. D Indoor unit coil outlet temperature sensor malfunction
Models: MLA, MPA, MPB
Mini-split unit (outdoor)
How it shows
- corp1816 multizone outdoor display: F4
This manual entry does not list further causes or actions.
Applicable models & manual sources
- MPA
No. D Indoor unit coil outlet temperature sensor malfunction
MPA, MPB, MLA
Outdoor unit EEPROM error
5 models
M22A, MCFA, MCFB, MFMA, MMDB
Mini-split unit (indoor)
How it shows
- 507550 indoor display: F4
This manual entry does not list further causes or actions.
Applicable models & manual sources
- M22A
Outdoor unit EEPROM error
M22A, MMDB, MCFA, MCFB, MFMA
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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