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Our reg plumber had a look and suggested that the valves at the pump may be blocked, which he changed. They were really black, but it's still pumping over. He thinks that we may need a powerflush and a new heat exchanger. What are "the c/f and o/v enters please?

Looking to the left of the boiler under the floor. Red dots correspond (see previous pics)

Pump installed Jan 2010, again wrongly by Homeserve, but we have access to electrics. Arrow shows boiler pumping direction

Shows HW valve and joist at LHS of above

Showing revised pipework Nov 2004. Pipework to underfloor for ch shown by red arrow

It was Homeserve who installed the pumps. We're still suffering with it. Got our regular plumber to look who thinks it could be one of the valves to the pump, not opening properly, so we'll try that next week.

And it goes on,,, We've been nursing the heating, it's either heating on and water off or vice versa otherwise it pumps over. Both work perfectly well if only one is on. Today a new and less powerful pump was fitted and set to number 2 level. The plumber checked the valves, both ok...

A different engineer called today. He checked the hw motorised valve which he said was working ok. He is going to order a less powerful pump and when it's installed will put the electrics at the top of the pump. As we can't bleed the pump-see pics, do you think the valve over the ch boiler...

No I don't mind at all. I just read your tale of the boiler installation. We had problems when we changed boilers in 2004/5 (when I was Witzend on here - forgot my password). It was the guys on here that helped me sort it out... so please don't squabble like you did on Meme's original post...

Engineer came today and checked the valve. Is ordering a smaller pump. We currently have heating on or heating switched off and hot water on. Can't have both.

The boiler is a Micron 70FF by the way, with an indirect hot water cylinder. Could the problem be the motorised valve on the hot water?

I assume so. looking at the original plan of the pipework by the installers in 2004. The water comes out of the top of the boiler turns to the right behind a cupboard and down under the floor. http://www.diynot.com/network/WillsNana/albums/ All pictures I have are now uploaded (click on Pump...

Underfloor pipework looking towards LHS of boiler

Piping to cylinder showing copper o/f and plastic refill from o/f tank

Airing cupboard

Pipework prior to Nov 2004

Don't know what you mean. I just turned up the cylinder stat which I'd left at 40 degrees but my husband said it was too cold. Within minutes bubbling hot water was pumping over into the overflow tank. Husband switched off the heating, leaving the water on and it stopped bubbling

The header tank is in the loft. cylinder in bedroom below, rooms are 7ft high. This has only happened since pump was replaced. It has run OK since Nov 2004 when new boiler, cylinder, rads installed. Could it be due to a slow moving motorised valve on the water? I switched off the cylinder...