What It Means
- Programmable Wired Controller: Outdoor IGBT temperature sensor error
- Programmable Wired Controller: Refrigerant leakage detection (Cooling mode only)
Lennox Split & Multi-Split
Lennox Error Code EF
Split & Multi-Split
EF 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
Outdoor IGBT temperature sensor error
Models: Programmable Wired Controller
Mini-split unit
How it shows
- 507550 wired controller: EF
This manual entry does not list further causes or actions.
Applicable models & manual sources
- Programmable Wired Controller
Outdoor IGBT temperature sensor error
Refrigerant leakage detection (Cooling mode only)
Models: Programmable Wired Controller
Mini-split unit
How it shows
- 507550 wired controller: EF
This manual entry does not list further causes or actions.
Applicable models & manual sources
- Programmable Wired Controller
Refrigerant leakage detection (Cooling mode only)
Programmable Wired Controller manual, page 7
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.
