E20
Aqua Dial
General System Error / Self-Test Failure
E20 error and the unit indicates a general system fault requiring service
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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 concurrent sensor faults, Internal PCB diagnostic failure, Firmware corruption, Incorrect wiring after service
How to Fix / Troubleshooting
Safety first: Disconnect power before any internal inspection.
- Power cycle: Turn off power for at least 2 minutes, then restore. Observe if E20 clears.
- Check all connections: Remove the control cover and inspect every connector, sensor cable, and motor lead for secure fit and visible damage.
- Review recent work: If the unit was recently serviced, verify that all components were reconnected correctly and that no connectors are swapped.
- Factory reset: If supported, perform a factory reset and reprogram the unit.
- Contact service: If E20 persists, the Aqua Dial control module may require replacement or firmware reprogramming by an authorised technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Control Module Assembly
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