What It Means
- Forced cooling.
- MWCB, MWHB: Force Cooling
- MLA, MPA, MPB: In forced cooling mode, the LED displays “FC” or alternative displays between running frequency and “FC”(each displays 0.5s)
Lennox Split & Multi-Split
Lennox Error Code FC
Split & Multi-Split
FC 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
Forced cooling.
8 models
3WMC, M22A, M33C, MCFA, MCFB, MFMA, MMDB, MWMC
Mini-split unit (indoor)
How it shows
- 507550 indoor display: FC
This manual entry does not list further causes or actions.
Applicable models & manual sources
- M22A
Forced cooling.
M22A, MMDB, MCFA, MCFB, MFMA
- M33C
Forced cooling.
M33C, MWMC, 3WMC
Force Cooling
Models: MWCB, MWHB
Mini-split unit (indoor)
How it shows
- 508242 indoor display: FC
This manual entry does not list further causes or actions.
Applicable models & manual sources
- MWCB
Force Cooling
MWCB, MWHB
In forced cooling mode, the LED displays “FC” or alternative displays between running frequency and “FC”(each displays 0.5s)
Models: MLA, MPA, MPB
Mini-split unit (outdoor)
How it shows
- corp1816 multizone outdoor display: FC
This manual entry does not list further causes or actions.
Applicable models & manual sources
- MPA
In forced cooling mode, the LED displays “FC” or alternative displays between running frequency and “FC”(each displays 0.5s)
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.
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