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Suzanne AlvarezJul 28, 2025
How to fix Vaillant Controller when no changes can be made on the display?
- CColton JonesJul 28, 2025
If you are unable to make changes on the display of your Vaillant Controller, it might be due to a software error. You can try to resolve this by: 1. Pressing and holding the button on the top right of the control for more than five seconds to force a restart. 2. Switching off the mains switch on all heat generators for about 1 minute and then switching them back on.
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