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Hi, During commissioning a Vaillant Ecotec Plus 837 boiler I measured the gas pressures which were 18 mbar at the meter and 14 mbar at the boiler gas valve, with the boiler at max load. The Vaillant manual says that the minimum gas pressures should be 19 mbar at the meter, and 15 mbar at the...

Thanks guys. Silly me, I didnt spot the hexagons inside the hole in the valve stem !!

I may be being dumb, but can someone tell me please how to open and close the heating flow and return valves on a Vaillant ecotec boiler? There seem to be some lugs which prevent the valve spindle from turning; is a special tool required? I've tried with a screwdriver and just managed to chew...