by chris_linney »
Sat Nov 29, 2008 8:53 am
firstly just because you get heat doesn't mean the pipe isn't nearly blocked , i have had many cases where 8mm tube has become blocked , or 10mm plastic tube becoming blocked , having said that i have come accross many that aren't, have you tried turning every radiator that heats off , all the upstairs and the remaining downstairs that heat , sometimes the pipework can get airlocked and you need to turn all the rest of the radiators off to force the air through the pipework otherwise it will just bypass thoase radiators, i'm assuming you have a combi boiler ,as you said pressure in the system, ok try the above if that doesnt work , the next step is to remove one of the inoperative radiators by turning the valve off at both ends if it doesnt apper to have a switch off it will be there under the white or grey cap , then that removed you should attach a hose pipe to one side of the pipework and then open the valve a little ata a time to see if you have flow then do the same at the other side , remember this water could be very black , make sure you have the heating off , you don't want to get scalded, AND REMEMBER PRESSURE IS DIFFERENT TO FLOW you can have a very high pressure with a poor flow , so don't assume its not blocked because it's got water dribbling out
