Worcester
Ignition Sequence Interruption
Boiler fan runs but there is no ignition and no error code, boiler eventually times out.
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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
Faulty gas valve coil, no power to gas valve from PCB, blocked injector, safety interlock not proving (e.g., air pressure switch)
How to Fix / Troubleshooting
Safety first: Do not attempt to bypass any safety devices. Gas components must only be serviced by Gas Safe engineers.
Homeowner checks:
- Confirm gas supply to the property is available.
- Reset the boiler once; if it still fails to ignite, stop and call an engineer.
Engineer actions:
- Check voltage at the gas valve during ignition attempt.
- Test gas valve coil resistance and replace the Worcester gas valve if open circuit.
- Inspect injector and burner for blockage.
- Verify air pressure switch operation and flue integrity.
Failure to ignite without codes often points to gas valve or safety proving issues.
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Repair Difficulty
Professional Required
5/5
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