E13
Baxi
Flue Gas Temperature Sensor Fault / Overtemperature
Boiler displays E13, often associated with flue gas temperature or sensor issues.
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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
Failed flue gas NTC sensor, Blocked or restricted flue causing high flue temperature, Poor combustion due to a blocked burner, Wiring fault to the flue sensor.
How to Fix / Troubleshooting
Safety first: High flue temperatures can indicate combustion problems. Do not operate the boiler continuously with this fault.
User checks:
- Inspect the flue terminal outside for obstructions and clear them.
- Reset the boiler once and observe if the fault reoccurs quickly.
Professional actions:
- A Gas Safe registered engineer will test the flue gas sensor, inspect the burner and heat exchanger for blockage, and perform a combustion analysis.
- They will also verify that the flue is correctly sized and installed per Baxi guidelines.
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Repair Difficulty
Professional Required
5/5
Required Part
Flue Gas Temperature Sensor
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