57
Noritz
Burner Overheat / Abnormal Combustion
Error code 57 displayed; unit may shut down during operation.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Scale buildup on heat exchanger, Blocked burner ports, Incorrect gas pressure, Restricted airflow through combustion chamber
How to Fix / Troubleshooting
Safety first: Turn OFF power and gas. Allow the unit to cool completely.
Steps to check and correct:
- Descale heat exchanger: Perform a full descaling flush through the Noritz service valves using an appropriate descaling solution. This improves heat transfer and reduces burner overheating.
- Clean burner: Remove the burner assembly per the service manual. Clean dust and debris from burner ports with compressed air and a soft brush. Do not enlarge or deform ports.
- Inspect air path: Check the combustion air intake and fan for obstructions. Clean the intake screen and fan housing.
- Verify gas pressure: Have a licensed technician measure and adjust gas pressure to Noritz specifications.
- Reset and test: Restore power and gas. If error 57 recurs, further professional diagnosis of combustion components and sensors is required.
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Repair Difficulty
Hard
4/5
Required Part
Heat Exchanger
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