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The 'fear' that it's heating up a lot more hot water than we need. I will look into restricting demand (especially for spring / summer). Thanks for your input.

Apologies, should have read the forum first. Just found another post that confirms my fears!

Greetings, a very basic question from an end user with no technical knowledge. We recently moved into a new house that has a Gas boiler (Worcester Bosch Greenstar 27Ri) and a Boilermate II. A Hive smart thermostat controls the heating and the hot water. I have no understanding of how the...

Thanks it was indeed a fuse, unfortunately the spur box was behind a panel wall which I didn't even know could be removed. Boiler now working and Nest installed successfully. Thanks everyone for your help / input

With the old Altech receiver, even if you switched it off or unplugged, the boiler would still work for hot water etc. Now the boiler is just not getting any power at all.

1. - no, the light comes on in the Nest but nothing happens with the boiler. The I/O light on the boiler is not coming on at all. 2. yea that's correct. L/N from the junction box, and COM/NO to the boiler. I've rewired the Altech receiver back the way it was, with the L/N from the JB and wired...

Yeah I've rewired the JB 3 or 4 times, but each time nothing happens.

Yea will look into it, although I am fast approaching the end of my comfort zone. All I did was: isolate mains> remove NO/COM from old stat> remove L/N from J box to old stat> rewire NO/COM to new stat> switch mains back on and the boiler is gone. So I'm a bit puzzled. Never touched the L/N/E...

Afraid not. There are no fused switches that I can see / am aware of. I can only think of the ones inside the boiler. No testing equipment am afraid.

Thanks. I've rewired the JB, still no joy. I'm gonna have to check for a fuse inside the boiler, but I am going to get a gas engineer for that.

Yes, the NO+COM cables still dangling out of the boiler. I've disconnected them from the Nest for the time being.

Nothing I can see or that I'm aware of the whole time I've lived here, apart from the fuse box switch (that isolates all the wall plugs in the boiler room, not just the boiler). Sorry :(

I don't think so. There's no fused switch for the junction box or the boiler. I isolated the mains from the fuse box. The mains connection appear from the back of the J box coming out of the wall. (Attached photo)

No it was definitely the L / N going into the Altech. The power is still connected between the junction box and the boiler (see photo)

hi again so I went back to the shop and swapped the NEst 3rd gen for a Nest-e as it seemed easier to install. Removed L and N that were left dangling from the Altech, connected NO and COM to the Nest, and then I went back to turn the mains on and the boiler now doesn't turn back on... I've...

Many thanks, will give it a go later and report back!

Thanks for the prompt reply, and sorry for the scarcity of information. The boiler is indeed a Vaillant combi. The Nest is a 3rd gen, so yea, as you say, slightly different, and will need powered. I've attached another image of the J box as previous one was blurry. Thank in advance.

Hi, I would like to challenge myself with the installation of a Nest thermostat to replace an old and partially faulty Altech wireless. I have no prior experience in this type of job and I am wondering whether it's a good idea or not, but if I don't try I will never learn. The Altech is...