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It's a heat only boiler by the looks of it, unless its been pressurised you'll not have to top it up with pressure and thats a weird fault.
There must be a hot water tank somewhere, it could be pipes vibrating together causing the noise, if it was me going to look at it. Id start at the pump, could be old and making the noise. Theres a million things and sometimes its easier to fix when its actually broken down than daft things like that.
My neighbour's house has been empty for a few years, family pop in occasionally to stay/check on it. The son is in right now and since he arrived, we have been woken up or kept up by really annoying vibrating water pipes, intermittent but can go on for 30 mins plus, vibrating through the wall, kind of like your phone on vibrate. It looks like it can be replicated by running the tap, but it has also happed at 3am when no one was up.
I popped round today and it's definitely the pipes, you can see and hear them in the basement. Most are clipped, not obviously hanging loose. I think (but I'm not sure) that the heating is off so it's probably the hot water.
I'll upload some pics of the boiler from my phone in a sec. I'm wondering if there is anything I can try as an easy fix? Not sure if a plumber will be called out any time soon and I'm really worried it will carry on after the son has left again.
Could I top up or reduce pressure, set temperature lower, is there a hot water tank somewhere that could be set too high?
Any help appreciated!