E02
De Dietrich
User Interface / Display Board Fault
Boiler shows E02, no display backlight or intermittent display
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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 De Dietrich display PCB, Loose ribbon cable between UI and main board, Damaged control panel from moisture, Incorrect low‑voltage supply from main PCB
How to Fix / Troubleshooting
Safety: Disconnect power before removing the front control panel.
Steps:
- Check contrast/brightness: Some models allow display contrast adjustment; ensure it is not set too low.
- Inspect ribbon cable: Carefully remove the control panel and check the flat cable connection. Reseat both ends firmly.
- Check for moisture: Look for condensation or water ingress around the panel. Dry gently if slightly damp, and identify the source of moisture.
Professional help: If the display remains dead, the UI board or main PCB may need replacement and reconfiguration.
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Repair Difficulty
Medium
3/5
Required Part
Display / User Interface Board
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