What It Means
- Outdoor unit EEPROM error
Lennox Split & Multi-Split
Lennox Error Code EC 51
Split & Multi-Split: Mini-split unit (indoor)
Causes & actions from Lennox
How it shows
- 507550 indoor display: EC 51
- 508242 indoor display: EC 51
This manual entry does not list further causes or actions.
Applicable models & manual sources
- M33C
Outdoor unit EEPROM error
M33C, MWMC, 3WMC
- MWCB
Outdoor unit EEPROM error
MWCB, MWHB
Disclaimer: This information is for general reference. Code wording and instructions vary by model. Always follow the service manual for your exact unit.
What should you check next?
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