What It Means
- Refrigerant leak sensor fault in the Indoor section (sensor #1)
Lennox Packaged Unit
Lennox Error Code 257
Packaged Unit: Packaged HVAC (outdoor)
Causes & actions from Lennox
How it shows
- rds unit controller alarm: 257
This manual entry does not list further causes or actions.
Applicable models & manual sources
- ZCD036
Refrigerant leak sensor fault in the Indoor section (sensor #1)
ZCD036, ZCD048, ZCD060, ZCD074, ZGD036, ZGD048, ZGD060, ZGD074
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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