E01
De Dietrich Main PCB / Control Board Fault

Control panel shows E01, boiler unresponsive, display may be blank or frozen

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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

Internal failure of De Dietrich main PCB, Power surge or incorrect polarity, Moisture ingress on electronics, Loose multi-pin connectors

How to Fix / Troubleshooting

Safety: Isolate power at the main switch before opening the control compartment.

Steps:

  • Check supply voltage: Verify that the boiler is receiving correct mains voltage and that fuses or breakers are not tripped.
  • Inspect PCB connections: Remove the front panel and carefully check that all multi‑pin connectors on the main PCB are fully seated. Do not touch tracks or components with bare hands.
  • Look for damage: Signs of burning, corrosion, or water marks on the PCB indicate replacement is required.
  • Power cycle: Reassemble, restore power, and see if E01 clears.

Professional help: PCB replacement and configuration (parameter transfer) must be done by an authorised technician to ensure compatibility and safety.

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Repair Difficulty

Professional Required 5/5

Required Part

Main Control PCB
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