Posted: Fri Feb 1, 2019 10:50am
Hi , do not have your type of boiler but as per dgiddi the water feed tap may be blocked with limescale , depending on your area but hard water is common in our location which blocks the tap only the same as what is in kettles.
What I would do is just turn the on/off water tap on and of about 6/8 times this may clear but of course not guaranteed.
Another option is the sink taps , on the spout is a removable cap were the water comes out , it has a small mesh/gauze ( as a precaution put the plug in sink as when you take the cap off the small rubber o ring does not get lost) just give it a clean and replace, this may again not be a cure but it is something to at least try before calling tradesman.
Hope it goes well