E17
Alpha
Mains Supply / Voltage Fault
Boiler shows E17 and locks out; may be associated with very high or very low mains voltage.
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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
Under-voltage or over-voltage supply, Loose mains connections, Faulty surge protection, Internal PCB power supply fault
How to Fix / Troubleshooting
Safety: Electrical work must comply with local regulations. Isolate power before opening any covers.
- Check other appliances: If lights are dimming or other appliances behave oddly, there may be a supply issue. Contact your electricity provider.
- Inspect mains connection: Ensure the boiler's fused spur is correctly wired and that the fuse is intact (typically 3A).
- Use a surge protector: Consider having an electrician install a suitable surge protection device if your area suffers from unstable voltage.
- Internal checks (qualified person): An engineer can verify the PCB's power supply section and replace the board if damaged.
Do not attempt to operate the boiler on an unstable electrical supply.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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