Recent content by mustbeunique

My system is Gloworm fuelsaver, open vented, twin pipe microbore. I can see part of the pipework - 22mm flow and return feeding 8 mm microbore to 9 rads with TRVs. There is a tenth rad in bathroom directly above the boiler fed by 15mm with wheel valve and lockshield. I have assumed this rad has...

It was the pump. A Grundfos automatically variable type. Must have been varying randomly when the back pressure changed. Fitted new pump - no further problems. Thanks for the help. PS Different username. Forgot my original one and had to re register.