i cannot drain my system .from the rad that i have always done it from .could this be a sludge build up
if so how do i empty the system
regards colin

colin, July 2009

Could be sludge build up. Look around the outside of the house for a drain point, or look for a valve (usually around the pump & motorised valves) that you can open to drain it off. Failing that you may need to just cut into a pipe. Just be aware that the more often you drain and re-fill the system you will be contributing to sludge build up, so ensure you use an inhibitor when re-filling.

Ian, July 2009