De Dietrich Control Board Output or Relay Failure

Interior light works but compressor and fans do not run; temperature rises in both compartments.

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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

Stuck or burnt compressor relay on PCB, Failed low-voltage power supply to control circuits, Broken wiring from PCB to compressor or fans, Faulty door switch preventing cooling cycle

How to Fix / Troubleshooting

Safety first: Unplug the refrigerator before touching internal wiring or boards.

Steps:

  • 1. Confirm door switch operation: Press the door switch; the interior light should turn off. If not, replace the switch.
  • 2. Listen for relay clicks: When plugging in and adjusting the thermostat colder, you should hear a click from the PCB. No click may indicate a control fault.
  • 3. Inspect the PCB: Look for burnt relay contacts or darkened areas. If present, the board should be replaced.
  • 4. Check wiring to compressor and fans: Ensure connectors are firmly seated and wires are not broken.
  • 5. Replace the main PCB: If inputs (sensors, switches) are good but outputs never energize, install a new control board.
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Repair Difficulty

Hard 4/5

Required Part

Main Control Board (PCB)
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