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There are two pressure gauges and they are pretty much at zero. not that I know off... Only two buttons, an on and off switch and a black button which I spoke of.

The Gas meter? Yeah. Cooking fish in the oven right now as a matter of face :D

I have a Vaillant central heating system. It's 10 years old, tried calling the support helpline but the number doesnt exist anymore. Gas credit ran out, and the heating went off, so I activated the emergency credit and pushed the black button on the boiler thingy and the heating came back on...