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