What It Means
- Low refrigerant
- Refrigerant leakage detection (Cooling mode only)
Lennox Split & Multi-Split
Lennox Split & Multi-Split Error Code EC
Split & Multi-Split
EC 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
Low refrigerant
10 models
3WMB036, M22A, M33A, M33B, MCFA, MCFB, MMDA, MMDB, MWMA, MWMB
Mini-split unit (indoor)
How it shows
- corp1816 cassette ducted floor display: EC
- corp1816 running light: 7 times
- corp1816 timer light: Off
- corp1816 wall indoor display: EC
- Indoor receiver display: EC
Low refrigerant (Running Light: 7 times, Timer Light: Off)
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
Low refrigerant
MWMA, MWMB, 3WMB036
- M22A
Low refrigerant
M22A, M33A, M33B, MMDA, MMDB, MCFA, MCFB
- M22A
Low refrigerant
M22A, M33A, M33B
Refrigerant leakage detection (Cooling mode only)
5 models
M22A, MCFA, MCFB, MFMA, MMDB
Mini-split unit (indoor)
How it shows
- 507550 indoor display: EC
This manual entry does not list further causes or actions.
Applicable models & manual sources
- M22A
Refrigerant leakage detection (Cooling mode only)
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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