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I don't particularly want to get someone in now, as this weekend I'll be draining and refilling the system again. Perhaps if it persists, I'll get a plumber/heating engineer in - bit would much prefer to try out "non-technical" possible fixes first.

Yes - water ok. No strange noises. No don't have a multimeter. Any advice?

Yes, gravity HW and pumped (Grundfos) CH. Since posting, CH has switched itself off again after running for about 4 hours. Also vented air from pump and air bleed screw on a vertical pipe in the airing cupboard. At a loss as to what to try next.

Boiler Name: Potterton Netaheat Electronic 10/16 I spent most of the day Sunday draining the radiators and then added some Fornex Central Heating restorer when refilling the header tank. Plan is to leave that for a few days and then drain again to get rid of any sludge. Anyhow, after...