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Mend Rayburn Highflow 400 Boiler Pressure Heating

i need to increase the pressure on my highflow 400 electronic rsf boiler?

i can see the cold water mains inlet valve but not the other end to open or where the water goes. know how to do it on other boilers but this one everything is hidden it seems. a huge thank you to anyone who can help.
may you all be warm and happy.

a frustrated zoe
January 2010
RayburnRayburn Highflow 400Heating, Home Heating SystemsBoiler Pressure Heating
pull the top cover off the boiler, it's usually under there.

Ian
January 2010

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Rayburn Highflow 400 Boiler Pressure - Help!