My Central Heating is still working after draining down the system to replace a radiator. Unfortunately the hot water has not come back on, I put a sludge remover in a week ago to see if that would help unblock it. Should I simply drain down the whole system or is there something more effective I can do. By feeling the heat from the pipes coming away from the boiler I can detect pretty much where the blockage is - if the blockage is not moved by draining down is there a tool that can be pushed through the pipe to help loosen the sludge? On a couple of the joints near what appears to be the blockage there are a couple of caps (bolt shaped) that look like they could be removed. Any advice would be greatly welcomed.
Podgeplumb I am afraid you have completely lost me! I have drained down a couple of times, and also allowed it to flush through by keeping the feeder tank in the loft running. A lot of sludge came out of the system, it is running pretty clear now. The central heating is working better than ever before, but unfortunately no hot water. A couple of the larger pipes coming from the boiler, which I believe feed the hot water to heat the hot water tank, are not fully hot and go cool down along the pipe very quickly. Does this sound like a bad blockage (do systems get blocked that badly??), would it be a good idea to get those pipes taken off when the system is drained down and replaced/cleaned out, or is this likely in any way to simply make the problem worse. I don't want to screw up the heating too!