Vaillant EcoTec Pro | How To Change The Gas Valve (F26 / F28 / F29 / F61 / F62 / F54)

REASONS WHY YOU MIGHT NEED TO CHANGE THE GAS VALVE: - If you are getting any of the following fault codes: F26 / F28 / F29 / F61 / F62 / F54 then your gas valve could be faulty and need replacing. Your gas valve may not be opening properly, or at all, it might even have debris inside it. Again, this video is for apprentices or newly gas safe engineers who want more experience with working on gas boilers.