Fondital
Delayed Ignition / Gas-Air Mixture Fault
Boiler ignites with a loud bang or pop (delayed ignition)
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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
Incorrect gas valve adjustment on Fondital boiler, Dirty or partially blocked burner, Weak ignition spark or incorrect electrode gap, Low gas pressure
How to Fix / Troubleshooting
Safety: Repeated loud bangs can damage the boiler and flue. Turn off the boiler and do not use it until checked.
User checks:
- Other gas appliances: Confirm they operate normally. If they also misfire, contact your gas supplier.
- Reset: Avoid repeated resets; call a technician promptly.
Technician actions:
- Clean the main burner and check for correct alignment.
- Inspect and adjust the ignition electrode gap and position.
- Check and adjust the gas valve settings using a flue gas analyser.
- Verify gas supply pressure at the boiler inlet.
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Repair Difficulty
Professional Required
5/5
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