What It Means
- CBK48MVT: Defrost mode. (Y, W and O call)
- CBX40UHV: Shown only while in active defrost (Y, W and O call)
Lennox Split & Multi-Split
Lennox Error Code d F
Split & Multi-Split
d F 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 mode. (Y, W and O call)
Models: CBK48MVT
How it shows
- Single-character display: d F
This manual entry does not list further causes or actions.
Applicable models & manual sources
- CBK48MVT
Defrost mode. (Y, W and O call)
Shown only while in active defrost (Y, W and O call)
Models: CBX40UHV
Air handler (indoor)
How it shows
- Single-character display: d F
This manual entry does not list further causes or actions.
Applicable models & manual sources
- CBX40UHV
Shown only while in active defrost (Y, W and O call)
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.
