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Called Vaillant and as mentioned paid £260 for a fixed price repair. This did not cover an Expansion tank which was another £150 if found to be faulty. Anyhow, to conclude the Engineer said he drained the Expansion Tank then re-pressurized and that all was well. He also mentioned...

Spoke to soon, been working for a few days but woke up on 1st January to a Red Light again. Pressed the button and off it went, pressure on the zero again. Time to ring for a mighty Vallaint Engineer I think as I know I am not up to taking it off and replacing the Expansion Tank. If anyone...

So checked it out on the back of the Boiler like you said. When I pressed the valve some Water did indeed come out. What I'm confused about though is why the Expansion would fail if it isn't leaking or split - i.e. can it still be re-pressurised I couldn't get my Bike pump to fit, not...

Thanks for the quick reply, could you tell me where the Expansion tank is located and can it be pumped up as several articles say without major surgery, the model is the 837. Thanks.

Hi there, Well winters here and the Central Boiler is not firing reliably. I just drove home through the Snow from a family Christmas in Ormskirk and the house was freezing and the red light on the Boiler was on. A quick press and it's up again - pressure is at Zero. Quick tweak...