A13
Wolf
Flue Gas Temperature Limit Exceeded
Boiler shows A13, burner shuts down, flue gas temperature too high
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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
Blocked or undersized flue, Faulty flue gas temperature sensor, Incorrect burner adjustment causing high flue temps, Heat exchanger scaled or partially blocked
How to Fix / Troubleshooting
Safety: High flue gas temperatures can be dangerous. Switch off the boiler and do not operate it until checked.
- Inspect flue terminal: From outside, ensure the flue outlet is unobstructed.
- Check boiler ventilation: For open appliance rooms, ensure ventilation grilles are not blocked.
- Reset once only: You may attempt a single reset. If A13 returns, leave the boiler off and call a technician.
- Technician tasks: A professional will test the flue gas sensor, inspect and clean the heat exchanger, verify flue sizing and routing, and adjust combustion if necessary.
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Repair Difficulty
Professional Required
5/5
Required Part
Flue Gas Temperature Sensor
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