What It Means
- CBX40UHV: Heat pump link not cut. AHC R-O link not cut for noncommunicating heat pump. Only on AHC Rev 2.4 or earlier.
- CBK48MVT: The R to O jumper was not removed on the air-handler control.
Lennox Split & Multi-Split
Lennox Error Code E346
Split & Multi-Split
E346 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
Heat pump link not cut. AHC R-O link not cut for noncommunicating heat pump. Only on AHC Rev 2.4 or earlier.
Models: CBX40UHV
Air handler (indoor)
How it shows
- Single-character display: E346
This manual entry does not list further causes or actions.
Applicable models & manual sources
- CBX40UHV
Heat pump link not cut. AHC R−O link not cut for non− communicating heat pump. Only on AHC Rev 2.4 or earlier.
The R to O jumper was not removed on the air-handler control.
Models: CBK48MVT
How it shows
- Single-character display: E346
Configuration link(s) not removed on control. Cut / remove R to O jumper. Applicable with non communicating outdoor unit with communicating indoor unit. The fault clears after the R to O jumper is cut/removed.
Applicable models & manual sources
- CBK48MVT
The R to O jumper was not removed on the air-handler control.
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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