EC
De Dietrich Main Control Board Communication or Internal Fault

Display shows EC and the refrigerator may not cool correctly; sometimes accompanied by relay clicking.

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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 main PCB microcontroller, Corrupted EEPROM or firmware, Shorted low-voltage supply on PCB, Loose connectors between display PCB and main PCB

How to Fix / Troubleshooting

Safety first: Disconnect the appliance from mains before accessing any electronic boards.

Steps:

  • 1. Power cycle: Unplug the refrigerator for 10–15 minutes, then reconnect. If EC reappears quickly, proceed.
  • 2. Check all connectors: Access the main PCB (rear or top) and the display PCB. Reseat all multi-pin connectors firmly, ensuring no pins are bent.
  • 3. Inspect the PCB: Look for burnt components, bulging capacitors, or signs of moisture damage. If present, the board should be replaced.
  • 4. Verify supply voltages: A technician can measure low-voltage outputs (e.g., 5 V, 12 V) from the PCB. Incorrect voltages indicate a failing board.
  • 5. Replace the main PCB: If communication or internal faults persist, install a new, compatible De Dietrich control board. Transfer any configuration jumpers or EEPROM modules as specified by the service manual.
  • 6. Reprogram if required: Some boards require parameter setup for the specific model; this should be done by an authorized service technician.
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Repair Difficulty

Professional Required 5/5

Required Part

Main Control Board (PCB)
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