What It Means
- Option code miss matching among the indoors (only for DPM)
Lennox Air handler
Lennox Error Code 557
Air handler: Air handler (indoor)
Causes & actions from Lennox
How it shows
- Wired controller display: 557
This manual entry does not list further causes or actions.
Applicable models & manual sources
- MMD***M6-1P
Option code miss matching among the indoors (only for DPM)
- MMD***S6-1P
Option code miss matching among the indoors (only for DPM)
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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