What It Means
- CBX40UHV: Relay Y1 failure. AHC relay activated, but not respond back .
- CBK48MVT: The Y1 relay on the air-handler has failed. Either the pilot relay contacts did not close or the relay coil did not energize.
Lennox Split & Multi-Split
Lennox Split & Multi-Split Error Code E347
Split & Multi-Split
E347 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
Relay Y1 failure. AHC relay activated, but not respond back .
Models: CBX40UHV
Air handler (indoor)
How it shows
- Single-character display: E347
This manual entry does not list further causes or actions.
Applicable models & manual sources
- CBX40UHV
Relay Y1 failure. AHC relay activated, but not respond back .
The Y1 relay on the air-handler has failed. Either the pilot relay contacts did not close or the relay coil did not energize.
Models: CBK48MVT
How it shows
- Single-character display: E347
Operation stopped. Y1 relay failed. Pilot relay contacts did not close or the relay coil did not energize. The indoor unit cannot verify that the relay is closed. The alarm clears after a reset and Y1 input sensed.
Applicable models & manual sources
- CBK48MVT
The Y1 relay on the air-handler has failed. Either the pilot relay contacts did not close or the relay coil did not ener- gize.
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?
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