E168
Potterton
General PCB / Power Supply Fault
Boiler intermittently displays E168, leading to random lockouts, often after power fluctuations.
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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
Unstable mains supply, loose electrical connections, failing PCB, incorrect earthing or polarity.
How to Fix / Troubleshooting
Safety first: Turn off the power at the fused spur before checking connections.
User checks:
- Check that the boiler is supplied from a dedicated fused spur, not a plug-in extension.
- Turn the power off for 5 minutes, then back on to reset.
Engineer checks:
- Verify the supply voltage, polarity, and earth at the boiler terminals.
- Inspect internal wiring looms and connectors for looseness or heat damage.
- Check for signs of water ingress onto the PCB.
- Replace the main PCB if all external causes are ruled out and E168 persists.
Persistent E168 errors usually indicate a PCB or supply quality issue.
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Repair Difficulty
Hard
4/5
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