E3
Winterhalter
Booster / Rinse Boiler Heating Fault
Rinse boiler does not reach temperature; machine shows E3 and may block operation until temperature is achieved.
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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
Failed boiler heating element, Faulty boiler NTC temperature sensor, Defective contactor or relay for boiler heater, Limescale on boiler element reducing heat transfer
How to Fix / Troubleshooting
Safety first: Disconnect power and allow the machine to cool. The rinse boiler can be under pressure and very hot.
- Check incoming water temperature: If the machine is connected to cold water instead of the specified hot supply, the boiler may struggle to reach setpoint. Verify plumbing against the installation manual.
- Descale boiler: If accessible, inspect the boiler for scale via service ports. Heavy scale requires professional descaling or boiler replacement.
- Reset and test: After cooling, reset the error (per user manual) and run a cycle. If E3 reappears quickly, the boiler heater circuit or sensor is likely defective.
- Professional testing: A technician should check boiler element resistance, NTC values, and heater contactor operation, replacing the failed part.
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Repair Difficulty
Professional Required
5/5
Required Part
Rinse Boiler Heating Element
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