[SOLVED] Help to spot boiler fill valve

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Brrrrrimcold

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Hello!

I need to repressurise my boiler but there seems to be no fill valve underneath. It was installed in summer and the guy got me to watch the pressure gauge on the boiler upstairs (and tell him when it reached 1) while he did something in the hot press downstairs. So I assume the fill valve is in the hot press.

Most of the valves seem to be open already so I'm guessing it must be one of the two odd-looking valves near the top (circled yellow and pink). I'm guessing the yellow one since the pink one has a little cap on it. Can you tell if it's one or both of these? And if so how do I open it/them? And do I have to do anything to the boiler or just have someone watch the pressure gauge while I open it downstairs? Thanks so much for any help you can give.

It's a Logic system2 s18ie boiler, if that helps. Showing low pressure fault after radiators bled.
 

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SOLVED
Took a gamble because it's cold here! Leaving this post up in case anyone has the same system and issue.

The top valve (circled yellow) feeds water into the system. Use a wrench to turn it anticlockwise until the pressure gauge on your boiler reaches 1-1.5 (or whatever your manual recommends).
 
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