Hi,
sorry i was away in Germany for work for a while their, anyway tested this just in the last hour, turned all rads off except top floor.
Results: Lots of noise like water trying to fill the rad then after about 5 minutes no noise and radiator only heat up about 1/4 way top part cold and bottom part warm.
In one room i have a cuppy door and in their i can see the pipes for the rads, their warm.
not sure what to do next, should i clear the rads of air if this blocking the heating, drain some water out.
any ideas, or is it just blocked and not letting enough water through.
Kind Regards
Fred.