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Mend Vaillant turbomax 828 Boiler Repair

How can I fix my Vaillant turbomax 828 ??

A certificated plumber recently made a repair to my Vaillant boiler, after which the unit appeared to be working ok apart from the pressure gauge which was soon indicating unacceptably high pressure in the system. He explained to me that the expansion chamber needed a top-up with air which he proceeded to do, that completed, he picked up his tools and said goodbye, unfortunately the pressure gauge hasn't worked at all since he left!. My calls to his number are being ignored, is it safe to continue to use the boiler in this condition?

Trusting Tony
February 2015
VaillantVaillant turbomax 828Heating, Home Heating SystemsVaillant Boiler Repair
With a cautious tone, yes, it should be safe. A Vaillant without pressure will generally throw up a F.22 or F.25 fault (lack of water), so it would be fair to suggest, some pressure exists in the system.
However, you will need to get the guage cleared/renewed asap just to make sure.
This would involve removing the pump, as the connection for the guage is behind it

123
February 2015

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Vaillant Turbomax 828: High Pressure & Faulty Gauge