Junkers Delayed gas ignition

Boiler ignition causes a loud bang (delayed ignition)

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.

Possible Causes

Incorrect gas pressure, Dirty burner, Incorrect electrode position, Slow-opening gas valve

Safety: Repeated loud bangs can damage the boiler and flue. Turn off the boiler and gas supply and do not use it until checked.

Do not attempt DIY gas adjustments: Gas pressure and burner settings must be checked by a certified technician.
Technician actions:
- Check and adjust gas inlet and burner pressure to Junkers specifications.
- Clean the burner and check for corrosion or blockage.
- Verify ignition electrode gap and position relative to the burner.
- Replace the gas valve if it is slow to open or not closing correctly.

Professional Required 5/5

Gas Valve Assembly

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