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Turn up the cylinder 'stat with the heating & hot water ON. Does it light up? If so follow my advice, if not, follow someone elses.

So assuming that (and I can't be aaaarsed to check) there is no demand for heat try turning up the hot water cylinder thermostat (and nothing else). If it suddenly springs into life then I would suspect the syncronous motor in the 3-port valve has indeed (as you suspected) gone kaputt. You can...

Since you managed to get two downstairs rads off without disaster you appear to have managed to turn off the rad valves satisfactorily. Why not try attaching a hose to the ends of the valves and flushing the pipework also. This would clear a lot more gunge and confirm your initial diagnosis of a...

If you can get the builder's details from the homeowner it might be best to approach Building Control (assuming it wasn't registered either). They seem to have more interest in this kind of installation than CORGI, and certainly have more teeth, but you have to do all the legwork and make it...

So where does this later latent heat go? May I suggest it warms the inner flue wall, which pre-heats the incoming air to some extent, except for Kestons; thus a (small) efficiency gain. I do agree wholeheartedly with the original comment though, many HE boilers are set up so badly that they...

There's often a sticker on the gas valve which indicates the boiler power e.g. "60" is 60,000 btu/hr. When you reset the boiler does this "whirring" noise last only for about 3 seconds? This could be the pump running, a characteristic of this boiler. If this is the case you may have a problem...

Have you checked that each of the TRVs works properly; neither stuck shut or failing to close?

Did they check the dosage of HRT she's taking?

That'll teach you for trying to get a cheap job done by the ex :D He's only trying to get some of the payments to the CSA back :lol: Trading Standards / CAB are the best bet, though if you really want a big bill, try the solicitor route.

All the Kestons have very flexible flue systems made up of fairly inexpensive muPVC pipe (though strange to note it is not sold in the Old Trafford Souvenir shop, just as well or it wouldn't be inexpensive :lol: ) It is also good to know that it's never been called Chelsea pipe for the same...

Building Control should be the ONLY place to go. Actually the building Regs state 2400mm from the boundary, though some manufacturers will allow this to be reduced in their installation instructions. If it really is a problem get a copy of the MI and read it. If it complies in all respects you...

6666, when you get the heating co. out to fix the leaking valve ask them to replace the pump at the same time as it will save them another call-out. You might want to buy a pump just in case they "forget" to bring one or turn up with a Chinese made one. (Buy a Grundfos, the higher quality is...

Thanks for the copious amounts of advice, despite the long delay in replying I have read and acted on them all, and the replies posted below. Just to re-cap, the (tested elsewhere) monitor immediately powers down the ht and goes into low power mode the moment it is connected to the graphics...

Depends how big your new rads are, and how far the run is. BS states no more than 2.5 m/s flow velocity which translates to about 30,000 btu/hr for 15mm copper, so you would be at the limit on 8mm microbore at about 7,000 btu/hr assuming your system is clean and the pump runs properly. OK, so...

What model valve is it? Did you thoroughly flush the pipework before fitting the valve, or could there be crud blocking the inlet strainer(s). Did you fit a flow restrictor into the cold inlet, and is it the right way around?

I can't comment on the various chemistry theories being bandied about, but I have a minimiser H/E in my back garden awaiting further investigation after what sounds like a very similar symptom. The boiler was properly powerflushed but still refused to be quiet enough for the customer, so the...

But don't the water regs require you to notify the Authority 10 days before you install an appliance which takes more than 12 litre/minute from the public supply? In that case the overflow only has to flow 12 l/min, doesn't it?

Poor flow is indicated. Is the water in the system dirty? What dirt came out with the old pump? Had one recently where the rubber ball had fallen off the end of the 3-port valve lever and was floating over the holes, severely retricting heating flow. Get co. to dismantle valve and check for...

Does that include your work too? I have fitted maybe 40 icos/isar in the last 2 years, had only 2 pcb failures (under warranty), one pump failure (warranty), and one blocked main H/E where the dozy builder who went in behind me shifted some rads then left the filling loop cracked open for two...

I like the method ChrisR, but it is contrary to the Water Regs (backflow prevention), and if you have the single checkvalve on your supply it may not work as you think. Won't you also get glugs coming back down the cold riser? Coming back to this system (Puma combi - no tanks assumed) surely...