E20
Siemens
General Self-Test Failure (Multiple Possible Subsystems)
E20 displayed, unit fails self-test at startup
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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
Multiple sensor faults, Incorrect wiring after previous repair, Defective main control PCB, Firmware corruption
How to Fix / Troubleshooting
Safety: Unplug the unit before inspection.
Basic approach:
- Power reset: Disconnect power for 10–15 minutes, then reconnect and observe if E20 reappears.
- Check recent work: If components were recently replaced, verify all connectors are correctly seated and no wires are pinched.
- Run diagnostic mode: Many Siemens ice makers support a service diagnostic mode. Refer to the service manual to run individual tests for sensors, fans, valves, and pumps.
- Board replacement: If multiple unrelated components test good but E20 persists, the main control PCB may need replacement.
Recommendation: Due to the broad nature of E20, professional diagnosis with Siemens service tools is often required.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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