De Dietrich No Electrical Power / Dead Control Panel

Water heater will not power on, display is completely blank

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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

Tripped circuit breaker, Blown internal fuse on De Dietrich PCB, Loose mains connection, Faulty main control board

How to Fix / Troubleshooting

Safety first: Only access electrical terminals if you are competent to do so. Otherwise, call an electrician.

Step-by-step checks:

  • Check breaker: Verify that the dedicated circuit breaker or fuse for the heater has not tripped or blown. Reset if necessary.
  • Check external switch: Ensure any local isolation switch near the heater is in the ON position.
  • Inspect power cable: Look for visible damage to the power cable or plug (if fitted).

When to call a professional: If power is present at the terminals but the display remains dead, the internal fuse or control board may be faulty.

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Repair Difficulty

Medium 3/5

Required Part

Main Control Board
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