E15
Judo
Display–Main Board Communication Error
E15 error and the Judo softener shows a communication fault between display and main board (on split-display models)
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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
Loose communication cable between Judo display module and control board, Damaged data cable, Failed display PCB, Failed main control PCB communication port
How to Fix / Troubleshooting
Safety first: Disconnect power before removing the display or control covers.
- Check cable connections: Locate the communication cable between the display and the main control board. Reseat both ends firmly.
- Inspect cable: Look for pinched, cut, or abraded sections of the cable. Replace if any damage is visible.
- Test with replacement display (if available): Swap in a known-good Judo display module to determine whether the fault lies in the display or the main board.
- Replace faulty module: If the cable is good and E15 persists, replace the defective Judo display module or Judo main control board as indicated by testing.
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Repair Difficulty
Medium
3/5
Required Part
Judo display module
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