E12
Judo
Real-Time Clock / Backup Power Fault
E12 displayed and the Judo softener reports a timekeeping or clock error
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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
Failed RTC circuit on control board, Depleted backup battery or supercapacitor, Frequent power interruptions, Incorrect time configuration
How to Fix / Troubleshooting
Safety first: Disconnect power before opening the control housing.
- Set correct time: Enter the user menu and reset the current time and regeneration time. Save settings and observe if they are retained after a short power loss.
- Check backup supply: Some Judo boards use a small battery or supercapacitor for memory backup. If accessible, inspect for leakage or swelling. Replacement typically requires board-level work.
- Stabilize power: Use an uninterruptible power supply (UPS) or surge protector if the installation suffers frequent outages.
- Board replacement: Persistent E12 usually indicates a failing RTC circuit; replace the Judo main control board.
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Repair Difficulty
Hard
4/5
Required Part
Judo main control board
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