E20
Danstoker
Mains Power / Phase Failure
Controller shows E20; power supply or phase fault alarm.
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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
Missing phase on three-phase supply, Incorrect phase rotation affecting Danstoker fan or pumps, Low voltage condition, Blown fuses in control panel
How to Fix / Troubleshooting
Safety: Electrical work must be done by qualified personnel. Isolate power before opening the Danstoker control panel.
- Check incoming supply: Measure voltage and phase presence at the main isolator. Restore any missing phase with the utility or building distribution.
- Inspect fuses and breakers: Check control fuses and motor protection breakers for the fan and pumps. Replace blown fuses with correct rating after identifying cause.
- Verify phase rotation: Use a phase rotation meter to ensure correct sequence. Incorrect rotation can cause fans to run backwards and trigger faults.
- Check power quality: If low voltage or frequent dips occur, consult an electrician to stabilize supply.
After correcting supply issues, reset the boiler and observe operation.
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Repair Difficulty
Hard
4/5
Required Part
Main Power Contactor / Supply
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