C/H system was upgraded with new boiler about two years ago. After this the system worked OK apart from two radiators running via microbore at the 'end' of the system, which did not get hot.
Explanation given was that the pipes were blocked up as they were microbore. (The radiators had worked prior to the boiler being installed).
I have however slackened the inlet side, to find a good pressure of hot water, and the same with the outlet. (I have no means of measuring the pressure so I don't know if there is a problem whereby some feeds have been crossed?) Slackening off the bleed screw also gives good pressure of water. All water is completely clear.
One radiator warms up just an inch in from the inlet and to the full height of the radiator, the other (a towel rail gets just a touch of heat all over - after about 20 minutes. I have tried stepping up the pump and opening the 'exit' valves fully - but there is no improvement.
Any ideas out there. ?
Explanation given was that the pipes were blocked up as they were microbore. (The radiators had worked prior to the boiler being installed).
I have however slackened the inlet side, to find a good pressure of hot water, and the same with the outlet. (I have no means of measuring the pressure so I don't know if there is a problem whereby some feeds have been crossed?) Slackening off the bleed screw also gives good pressure of water. All water is completely clear.
One radiator warms up just an inch in from the inlet and to the full height of the radiator, the other (a towel rail gets just a touch of heat all over - after about 20 minutes. I have tried stepping up the pump and opening the 'exit' valves fully - but there is no improvement.
Any ideas out there. ?