E12
Bosch
Communication Bus / Data Link Fault
E12 displayed; internal communication error between ice maker module and main control.
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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 or damaged harness between ice maker and main PCB, Corroded connectors, Faulty ice maker control board, Faulty main control board communication circuit
How to Fix / Troubleshooting
Safety: Unplug the appliance before handling wiring or boards.
- Inspect harness: Trace the multi‑wire harness from the ice maker to the main control board. Look for pinched, cut, or abraded insulation.
- Reseat connectors: Disconnect and reconnect the harness at both ends several times to clean contacts. Ensure each connector locks fully.
- Check for moisture: Look for signs of condensation or water intrusion near connectors. Dry thoroughly and correct any source of leaks.
- Module substitution: If wiring is intact, replace the Bosch ice maker module first, as it is more commonly at fault than the main PCB.
- Main board replacement: If E12 persists with a new ice maker and verified wiring, the main control board may need replacement. Label all connectors, swap the board, and reassemble.
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Repair Difficulty
Professional Required
5/5
Required Part
Bosch Ice Maker Assembly or Main Control Board
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