Re-pressurise Worcester Bosch 24i RSF -Idiot guide required!

[rick_x]

I've searched the forums for some advice but can't find anything specific to my problem.

I have a WB 24i RSF gas combi that was on low setting (18 degrees) for the weekend and I noticed today that the pressure gauge on the boiler had dropped to zero. I followed other posts and have read the FAQ to repressurising but cannot for the life of me find a valve or tap(s) to re pressurise the system. I've checked all the pipework around the boiler itself and can see nothing. I have the in-laws here from Greece at the moment so they really feel the cold so I'd be eternally grateful if someone could give me some advice on how to fix this.

Thanks in advance

Rick

 

[corgiman]

do you have a big white Key?

if not you aint going to fill it. sorry

 

[Softus]

 

[jeffreyw]

big white key and grey plastic nut under boiler
diffrent from the norm init
get key from parts centre if you aint got one