E15
Keston Mains Supply / PCB Power Fault

Boiler shows E15, no display backlight or intermittent power loss

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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

Loose mains connection, Blown internal fuse, Faulty main PCB, Incorrect polarity or no earth

How to Fix / Troubleshooting

Safety: Isolate the boiler at the fused spur before removing the case. Electrical work must comply with local regulations.

User checks:

  • Check that the boiler's fused spur is switched on and the fuse has not blown.
  • Verify that the household consumer unit has not tripped.

Engineer checks:

  • Inspect the mains terminal block inside the Keston boiler for tight connections and signs of overheating.
  • Check and replace any internal fuses on the PCB with the correct rating if blown, and investigate the cause.
  • Verify correct polarity, voltage, and earth at the boiler supply.
  • If supply is correct but the boiler remains dead or shows E15, test and replace the main PCB as necessary.
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Repair Difficulty

Hard 4/5

Required Part

Main Control PCB
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