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Thanks...I will carry out the suggested checks and report back

Ok, so with the hot water switched off on the programmer, the heating will not run with the tank stat either on or off. Does this indicate valve head at fault somewhere? I could just replace the head - the cost is not excessive.

Thanks for your detailed reply- I've never been happy wielding a multimeter on A.C., so I will try your other suggestion and report back.

Conventional gravity fed system with 3 port valve and HW cylinder stat - unless the cylinder stat is triggered, the CH pump will not run. Consequently, HW temp has to be up much higher than I would like, in order to heat the radiators. System is Danfoss AT tankstat and Danfoss programmer, and a...

Hi Tony...I understand your assumption and I didn't make things clear. It's actually my mum's place and she passed away in October and finding time over there is tricky. Equally, juggling work and trying to liaise with a CH engineer near Xmas is not so easy. And no part of the system has been...

Hi...as far as I can tell it comes on and fires for as long as is needed. Difficulty for me is that I'm not living in the property. When CH is on and rooms stat turned up, it runs continuously but obviously can't get stat up to temp as rads don't get hot. Tank stat is set to 100F, but I didnt...

Yes...everything is seriously slow. Radiators really not getting hot at all, but I can't understand how I'm still getting hot water. Checked the 3 way valve again and it's definitely working - I can watch it moving between positions with the cover off and switching demand. With the actuator...

Checked and found the pump to be fully operational. Still getting hot water to the storage tank. Pipe at top of tank is hot. Pipe in centre and at the bottom are cold (or vaguely warm, I guess from conduction). Any other suggestions? Certainly, the feed to pump and port AB remains cold over 20...

Just a thought though...how would hot water get to the tank if the pump is not functioning?

Thanks for your help Ian - I must admit that the pump sounded and felt super smooth whilst running. This may be a good or bad sign! I will carry out the checks and re-post.

Ok, I'm with you. I assume there is a seal between the 2 halves, will this need replacing or ok to re-use? Saw another suggestion that when switched off, if the shaft rotation stops slowly, this could be another sign that there is no resistance, but sound simple enough to split the body.

Grundfos Selectric

Ok...how would I check though? The shaft certainly turns easily with a screwdriver when the drain plug is out, but I guess it still would if impellor had sheared. If it had sheared off, surely I would never get hot water up to the pump from the boiler and I have a tank of hot water...?

Glow worm Hideaway boiler, Honeywell 4073 3-port valve, Grundfos pump, microbore pipework. System has had no recent physical changes – heating back on after summer and running for some weeks since then. Recent sudden loss of heating but still hot water present in tank. Turning CH on and off with...