Worcester green Star 24ri

[IE00]

Hello we have moved into a new house with a very old Worcester Green Star 24ri boiler. I have a blue light flashing, which the manual tells me means there is low pressure.

But I can't find the pressure valves. I've seen in YouTube videos that there should be a white key which inserts into some valves but there is nothing. Does anyone know how to find the valves?

Photos of the boiler attached.

 

[Stadan20]

There will not be a white key with this one . The filling loop is probably where your hot water cylinder is . Might look like a braided hose. Search external filling loop . Once you have topped up the system pressure approx 1.5 bar . Turn the right hand side dial all the way anti-clockwise . Wait for 10 seconds and turn it back to 3/4 clockwise