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i know i'm thick but how do you top up a powermax 140/155 boiler. i've taken the front panel off and found the mains cold inlet but there is no valve. please help.

I have two cold radiators. 1 is upstairs and the other is downstairs. It is a fairly new house (three years old) although I only moved in a few months ago. I have bled all the radiators. I have shut off all warm radiators and opened all cold radiators but they still do not warm up...