What It Means
- Active clean
- Filter cleaning reminder(power on display for 15 seconds).
- MLA, MPA, MPB: When the LED displays CL, this is a reminder to check and clean the air filter.
Lennox Split & Multi-Split
Lennox Error Code CL
Split & Multi-Split
CL 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
Active clean
10 models
3WMC, M22A, M33C, MCFA, MCFB, MFMA, MMDB, MWCB, MWHB, MWMC
Mini-split unit (indoor)
How it shows
- 507550 indoor display: CL
- 508242 indoor display: CL
This manual entry does not list further causes or actions.
Applicable models & manual sources
- M22A
Active clean
M22A, MMDB, MCFA, MCFB, MFMA
- M33C
Active clean
M33C, MWMC, 3WMC
- MWCB
Active clean
MWCB, MWHB
Filter cleaning reminder(power on display for 15 seconds).
8 models
3WMC, M22A, M33C, MCFA, MCFB, MFMA, MMDB, MWMC
Mini-split unit (indoor)
How it shows
- 507550 indoor display: CL
This manual entry does not list further causes or actions.
Applicable models & manual sources
- M22A
Filter cleaning reminder(power on display for 15 seconds).
M22A, MMDB, MCFA, MCFB, MFMA
- M33C
Filter cleaning reminder(power on display for 15 seconds).
M33C, MWMC, 3WMC
When the LED displays CL, this is a reminder to check and clean the air filter.
Models: MLA, MPA, MPB
Mini-split unit (outdoor)
How it shows
- corp1816 multizone outdoor display: CL
This manual entry does not list further causes or actions.
Applicable models & manual sources
- MPA
When the LED displays CL, this is a reminder to check and clean the air filter.
MPA, MPB, MLA
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?
Continue in ACLogics with guided diagnosis for your equipment and symptoms.
