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i think i may have bleed my heating system incorrectly and now i have no pr?

i think i may have bleed my heating system incorrectly and now i have no pressure reading on my boiler guage.

it is a Potterton suprima 30 - 80
ben, March 2010
I'm assuming this is a combi boiler?.when you bleed the rads the pressure drops.somewhere on the boiler or connected underneath is a filling loop.this needs switching on and you watch the pressure dial and put the water pressure back in to the rad system

A1, March 2010
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