E20
Hansgrohe
Generic System Fault / Self-Test Failure
E20 error and the unit indicates general system fault not covered by other codes.
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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 minor sensor discrepancies, Firmware bug, Intermittent wiring fault, Control board hardware failure
How to Fix / Troubleshooting
Safety: Disconnect power before extended inspection.
- Record conditions: Note when E20 occurs (during service, regeneration, or idle) to help narrow down the cause.
- Check all connections: Systematically inspect and reseat all accessible connectors on the Hansgrohe control board, sensors, and valve motors.
- Firmware reset: Perform a factory reset and reprogram all settings according to the installation manual.
- Isolate components: Temporarily disconnect non-essential accessories (remote displays, external sensors) to see if E20 clears.
- Board replacement: If E20 persists despite clean wiring and correct settings, the main control board is likely defective and should be replaced by a qualified technician.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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