Fluctuating / jumping temperature on Vaillant boiler / How to replace PCB / Motherboard step by step

Опубликовано: 13 Июль 2026
на канале: B Heating Service
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Fluctuating / jumping temperature on Vaillant boiler / How to replace Printed Circuit Board / Motherboard step by step

This video is for GAS SAFE ENGINEERS only, always follow manufacturer instructions.

Before to start any work on gas appliance isolate the power, turn off the gas and the waters.

1. Download manual
https://professional.vaillant.co.uk/d...
2. Remove front cover
3. Remove PCB cover
4. Disconnect cables
5. Replace PCB
6. Reconnect cables
7. Test it