F5
Drazice
Anti-Legionella Cycle Fault
Drazice digital heater shows F5; anti-legionella function fails or stops mid-cycle.
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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
Insufficient heating capacity due to failed element, incorrect time or temperature settings, sensor misreading, control board error
How to Fix / Troubleshooting
Safety: Turn OFF power before opening covers.
Checks:
- Verify that the heating element and thermostat are working by checking if the heater can reach the normal set temperature.
- Enter the settings menu and confirm that the anti-legionella function is enabled and scheduled correctly.
- Ensure that the maximum temperature limit is set high enough to allow the anti-legionella temperature (typically 60–70°C).
- Check the main NTC sensor for correct readings; replace if faulty.
- If the heater cannot reach the required temperature even with a good element and sensor, there may be excessive limescale or a control board issue requiring professional service.
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Repair Difficulty
Hard
4/5
Required Part
Main NTC Temperature Sensor
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