Boiler pressure

[RhubarbAndMustard]

Can anyone help please? We have a Valliant boiler and the pressure is below zero. This happened before and the boiler engineer said to turn 2 screws (1 at a time) to add in the pressure...but I can only find one turnable screw. Internet said it should be either end of a grey flexible pipe, but of course our boiler has no grey flexible pipes! Any ideas anyone?

I would be eternally grateful as I'm on Mat leave and could really do without the bill of an engineer!

[RhubarbAndMustard]

The turnable screw I can find is at the bottom of the silver pipe.

[Katy92]

Is there not one on the opposite side? Ours are opposite each other?

If you unscrew it all the day, do you hear a whooosh sound?

[Katy92]

Ours drops below zero as we have a leak, you might also want to check it's not leaking anywhere?

[Lilmisskittykat]

I have a water pipe that I connect then open the value to let the water in to heighten the pressure..

To be on complete zero seems to be a bit of a concern. I agree with another poster that check for leaks

[RhubarbAndMustard]

We found it and there was a woosh sound. Problem fixed. Thank you! I will definitely keep an eye on it in case of a leak.