A13
Fondital
Flue Gas Overtemperature / Safety Cut-out
Boiler locks out with A13, often after long operation; the casing may feel unusually warm.
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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
Partially blocked Fondital flue or terminal, Incorrect flue installation causing recirculation, Faulty flue gas temperature sensor, Fan not reaching the correct speed
How to Fix / Troubleshooting
Safety: Turn off the boiler and ventilate the room. Do not operate the boiler until the flue system has been checked.
User checks:
- External flue: Visually inspect the external flue terminal for obstructions or signs of flue gases staining the wall.
- Reset: After cooling, perform a single reset. If A13 returns, stop using the boiler.
Technician actions:
- Inspect the entire Fondital flue system for blockages, incorrect joints, or recirculation issues.
- Test and replace the flue gas temperature sensor if its readings are incorrect.
- Check fan speed and modulation; replace the fan if it is underperforming.
- Verify combustion settings with a flue gas analyser and adjust the gas valve if needed.
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Repair Difficulty
Professional Required
5/5
Required Part
Flue Gas Temperature Sensor
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