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Managed to dig it out today. Looks like it's an over-engineered base for a parasol or something...

Hi all, Does anybody have any idea what this could be? I'm digging out to lay a new patio. At first I thought this was concrete for a washing line or parasol (there's a piece of circular metal in the concrete), but it's deeper than I expected and seems to be made up in part of brick and...

Also, does this wiring look okay? I had to bend the live and neutral wires more than I'd like to get the cable into the clamp (the connector contains the old switch wire). Many thanks again for all your help!

Okay, I had a play around with the settings. Selecting either "other" or "system" boiler, then "not connected" for the hot water seems to solve the problem. The boiler is now in charge of the DHW temperature via the dial on the front, and the boiler hasn't fired up randomly to heat DHW. Is...

The DHW settings are fairly limited with the Nest in combi mode. Perhaps I need to have a play around in system boiler mode? I think the settings open up a bit then.

Nope, and now that you mention it the problem wasn't there when the boiler and heatlink were on but not yet set up. As soon as I got to the equipment stage of setup and confirmed the settings in my last post, the boiler kicked in to heat DHW.

So, this evening I returned the Nest E and bought the 3rd Gen. Successfully wired it up (a bit fiddly but I got there in the end) and... the boiler's doing exactly the same thing. The Nest equipment settings are: combi boiler, OpenTherm, central heating temp 65c, DHW 50c. Any ideas? I have a...

DHW is set to 50c at the moment. The Nest does seem to control the temperature as it should, as I tried turning it down to 40c and it worked. However, once the boiler cools down, it fires up and heats the water to 60c (as shown on the boiler display). It's odd. EDIT: The only thing that seems...

Thanks, I think I'll try to return the Nest E and replace it with the 3rd Gen then. I got the E because installation seemed to be easier, but in the end I had to install a new wire anyway. Luckily the terminals on the boiler are accessible without removing the main cover... Nest reckon their...

Right, thanks. So I guess the options are live with it or switch to a different thermostat, unless there's a workaround? I don't think Baxi or Nest are aware of this, or at least they didn't mention it when I spoke to them

Hi both, Many thanks for your replies! I'm confident that the Nest heat link is wired up correctly — OT1 and OT2 to terminal X8 on the boiler. The old thermostat controller had four wires — two for power and two for the 230v switch. I terminated the power and removed the 230v switch cable from...

Anyone got experience of wiring the Baxi 200/400 series with OpenTherm? Nest is controlling the central heating and domestic hot water temperature as expected, so I guess the wiring is okay. If the link wire in the 230v switch terminal was causing a problem then the boiler would be firing for...

Hi all, I've searched online and can't find anyone with the same issue, so thought I'd post here. At the weekend I installed a Nest Thermostat E to my Baxi 228 using OpenTherm, replacing an on/off thermostat. Initially, I removed the old thermostat's wire from terminal X4 and did not reinstate...