Vaillant
No Power to Control
Softener display is completely blank and unit is unresponsive
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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
Blown internal fuse, Faulty external power supply or transformer, Loose power connector, Failed control PCB
How to Fix / Troubleshooting
Safety: Ensure the circuit is de‑energised before opening any electrical covers. Only competent persons should test live circuits.
Steps:
- Check outlet: Verify that the socket supplying the Vaillant softener has power by plugging in another device.
- Inspect power adapter: If an external transformer is used, check for damage and measure output voltage if possible. Replace if faulty.
- Check internal fuse: Remove the control cover and inspect any accessible fuses. Replace only with the same rating and type.
- Inspect PCB: Look for obvious damage such as burnt components. If present, the PCB will need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Power Supply / Control PCB
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