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Ariston Micro Genus type C top up water pressure?

Boiler has two blue knobs (right and left). Which one do I turn to increase pressure to 1 bar? Do I turn clockwise?
GG, October 2012
Have tried both knobs nothing happening.

Jax, October 2014
You need to open both. I just tried it.

Janos, January 2013
Try both open you will see pressure going up than close or try one by one if that makes pressure going up

ltd, October 2012
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