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When carrying out an EICR do they look at the condition of wiring at a boiler and or thermostats? The reason why I ask is, often I attend some poorly installed receivers etc. However, two of the worst I have seen are: one I attended a few years ago, someone had cut the cable exiting the fcu to...

That indicates that it’s hot water. I would say if there’s no screw that it pulls off.

Not something I’ve heard of before, but always a first I suppose.

There should already be pipe supports in there for that, so, bing careful you can re-use the existing ones

There’s certain pan connectors for older toilets, so depends on the existing

Ok, 3rd up from the bottom of the terminal strip looks like your neutral wire as there’s a blue from the motorised valve cable at the top

Usually printed on the instructions and afaik no silicone is needed at all.

If you follow the blue from your motorised valve cable (it appears yours is a black cable) then all the neutrals should be located together, it’s not the best photo to see clearly

There won't be power to it because it needs a permanent neutral as I said in the linked thread. You need to ideally bell the wires to ascertain which is which grey and then connect to Neutral in the wiring center, ideally sleeving or taping blue so people know it's a neutral. Alternatively...

That looks like an unvented cylinder vessel and you shouldn't be touching that as you need to be G3 registered/competent.

Or flat, especially since you've depressurised it

If there was no passing of the valves, and 1 is flow and 1 is return, then imo that points to the boiler, or did it drop when you opened back up?

Have you checked at the prv before any pipework discharge?

No, that's a bypass valve

Usually down the condensate from the main heat exchanger, but I've just realised you've tried that.

Pressurise the system to approx 2.5 bar, Isolate the boiler flow and return and unisolate the boiler after a period of 8 hours. If it drops before that it's the boiler, if it drops after that, it's the system.

He already has eph, maybe doesn’t like it?

So it sounds like you only need a 2 channel then? Or perhaps a 2 and a single channel?

A quick search suggests it’s bound or setup incorrectly? Have you contacted Resideo/Honeywell?

TMV’s ime are ok. I had a Bristan/Gummers that was good, steer clear of Reliance/John Guest -absolutely crap with support where blame is placed upon you.