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I've told you what I think the problem is. Maybe someone else will appear and review things and confirm or reject my suggestion but in the absence of that, get a plumber to come and fix it!

Thanks John. I was rather thinking of a, rather unlikely, situation where you had live on earth but no other path to earth on the installation except that would be created through a person themselves. I assume you could quite a shock before the circuit tripped.

I will indeed!

I suppose you could get "to earth" through a water or gas pipe which would hopefully trip something. Certainly wouldn't really fancy a Home Alone esque electrocution when turning a tap on!

Seems like a malicious person with access to your meter cupboard (in a TN-C-S or TN-S system at least) could disconnect your earth (making your installation unsafe) or, worse, connect it to a live supply.

If you're competent and happy to work with live 230v, get a multimeter and check whether you're getting anything on your orange wire.

If you sign up with someone like Homeserve, they'll either want to inspect the system first or have an exclusion period where you can't make a claim. You'd be best getting a plumber/heating engineer out to look at this specific issue and then getting cover for any future issues. You probably...

So it does sound like your valve is doing what it's supposed to do physically and closing when heating isn't required and just opening for HW. We know it opens for heating when heating is required too otherwise it wouldn't ever work. So, as I said, it sounds like your boiler isn't getting a call...

Sounds like your valve isn't doing what it's supposed to then. Is it moving at all when there's a demand for heating or hot water? For example, when hot water is on and heating is off, does the heating still heat up? If so, it'll be stuck in a position where both A and B are open at all times...

A faulty switch in the valve on the orange connection would explain heating only working when hot water is on. The valve is opening but isn't making the connection to call for heat from the boiler. However, you said in the first post that you have to have the heating on in order to get hot...

When you just have heating on and hot water off, do you have heated water coming into the valve? I.E. is your boiler working when it's in this state?

When you say it doesn't work, is the boiler producing heat when only hot water is supposed to be on? You need to identify whether the issue is with the valve or elsewhere. The wiring (despite being a hideous mess of colours) does look OK to me (although some assumptions have been made about the...

Can you turn all the power to the heating circuit and take a picture of the wiring behind the programmer? I'd guess the green goes to heating ON, black goes to HW ON and grey is going to HW OFF (assuming the colours of the cables to the valves match the standard practice).

There's something wrong with your wiring. Sounds like you've been making some changes yourself so anything could be wrong. Have you got a pic of the programmer's wiring? Edit: seems omega posted at the same time :)

There's an couple of unidentified green cables in that wiring centre connected to strange things. You'd expect that green cables were only used for earth and, if you must use them, you'd hope to see some brown tape on it to show its carrying live. The earth to your programmer is connected to...

Surely that's just border-line gross negligence?

I believe R is the 230v switched live which would usually be connected to 230v system controls. You could likely use this with Hive (terminal 3) along with a permanent live to terminal 1 and L (plus neutral to N and earth). Alternatively, you can just take a permanent live and neutral some...

At a quick guess, you should be good with this (assuming you've identified the correct cables on your connection block): Your 1 (Perm Live) to Nest L (and Nest 1) Your 2 (Call for heat) to Nest 3 (NO) Your 4 (Neutral) to Nest N Nest L to Nest 1 You should dig out that earth and connect it to...

Oh I have - it's mind numbingly boring stuff - it still doesn't really warrant such personal abuse towards him.

I know how frustrating it can be working with people who know less than you but this really isn't an acceptable way to behave towards them. If you don't want to help, don't but don't just sit around being insulting towards them. As you say, you've been in the industry for over 36 years and the...