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Topping up an Ariston combi boiler?

How often should you have to top up your combi boiler with water to keep the pressure at a satisfactory level?
Jane, September 2006
The non-return valve could be at fault - put pressure up to 1.5bar and then open/run a tap and/or flush a WC if pressure drops it's the non-return valve failing.

Brian, September 2006
they can drop very slightly over a period of months. if your loosing a lot very quick you have a leak some where check all your radiators for leaks.

hi-spec plumbing, September 2006
link Click here to see other fixes for Ariston Micro.