What It Means
- COND temperature sensor error
Lennox Air handler
Lennox Air handler Error Code 231
Air handler: Air handler (indoor)
Causes & actions from Lennox
How it shows
- Wired controller display: 231
This manual entry does not list further causes or actions.
Applicable models & manual sources
- MMD***M6-1P
COND temperature sensor error
- MMD***S6-1P
COND temperature sensor error
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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