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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 dont know how to alter the pump speed, but i put the thermostat right up. i've just drained about 1 litre of water from the radiator, still no heating at all.

about a mug full

shut one valve then opened the other. bled through vent, water came out. no heating of pipes observed. shut open and opened other valve. repeated above. still no heating of pipes observed.

I'm not sure whether or not there is a by pass valve, where would it be? The other radiators in the house are ok. There are TRVs on all the radiators and I have taken the plastic knob off to check if they are stuck - they seem to be ok as i can press them down and they pop back up again...

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...