What It Means
- Error of communication down between the indoor unit and wired remote controller after completion of 10 times tracking.
Lennox Air handler
Lennox Error Code 604
Air handler: Air handler (indoor)
Causes & actions from Lennox
How it shows
- Wired controller display: 604
This manual entry does not list further causes or actions.
Applicable models & manual sources
- MMD***M6-1P
Error of communication down between the indoor unit and wired remote controller after completion of 10 times tracking.
- MMD***S6-1P
Error of communication down between the indoor unit and wired remote controller after completion of 10 times tracking.
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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