E13
Grünbeck
Low Voltage / Power Supply Error
Display shows E13 and the unit reports a power supply fault
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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
Defective plug-in power supply (transformer), Loose power connector, Internal power supply fault on PCB, Incorrect mains voltage
How to Fix / Troubleshooting
Safety: Disconnect the unit from mains before inspection.
- Check mains outlet: Verify that the outlet provides the correct voltage with a test device and that it is not controlled by a switch or timer that cuts power unexpectedly.
- Inspect power adapter: Many Grünbeck softeners use an external plug-in power supply. Check for damage, overheating marks, or loose plugs. Replace with an original Grünbeck-rated adapter if suspect.
- Check low-voltage connector: Ensure the low-voltage plug from the adapter is firmly seated in the control unit.
- Internal inspection: If the external supply is OK, the internal power supply section on the PCB may be defective. This requires PCB replacement by a service technician.
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Repair Difficulty
Medium
3/5
Required Part
External Power Supply and Control PCB
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