E03
BWT Perla
Flow Meter / Turbine Sensor Fault
Display shows E03 and the unit remains in service without regenerating
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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
Blocked turbine in BWT Perla flow meter, Damaged flow sensor cable, Defective Hall sensor on flow meter, Incorrect installation direction of flow meter cartridge
How to Fix / Troubleshooting
Safety first: Isolate the BWT Perla from water and power. Depressurize by opening a downstream tap.
- Check for flow indication: With the unit powered, open a tap and check if the display shows flow or consumption. If not, the flow meter is not registering.
- Inspect flow meter assembly: The flow meter is typically integrated in the valve head on the inlet side. Remove the inlet union and carefully extract the turbine cartridge following the BWT Perla service manual.
- Clean turbine: Rinse the turbine wheel under running water. Remove any sand, rust, or scale. Ensure the wheel spins freely with a gentle puff of air.
- Check wiring: Inspect the small sensor cable from the flow meter to the control board for damage, loose connectors, or corrosion. Reseat connectors firmly.
- Reassemble and test: Reinstall the turbine in the correct flow direction (arrow on body). Restore water and power, then open a tap and verify that the display now registers flow and the E03 code clears after a reset.
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Repair Difficulty
Hard
4/5
Required Part
Flow Meter / Turbine Sensor Assembly
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