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Well, I learnt a lot. Unfortunately I don't have the time I used to, to learn as much as I evidently need :-( I now predict a trend of homeowners all around the world rising up in their own misguided attempts at attempting to conduct home improvements. They might badge it "Do It Themselves"...

It did. That'll keep us going until Friday. Thanks for helping me out! I'm debating whether to leave it as-is to avoid any more carnage, and have the board replaced, before I go and consider anything else. I'm also wary of anything else that might have been damaged - for example, I'm now...

It did. That'll keep us going until Friday. Thanks for helping me out!

Well - it seems I need to do something in the short term, so I've opened the front to take a look. Seems easy enough. I can see the 240V leads to the thermostat, and the other two are indeed on the 24V header. I guess that's that then, if the Hive did put 240V down it. :-( I can't see any...

Well, if I close the two thermostat wires, that's electrically identical to putting a bridge on the pins they're connected to in the boiler?

I'm in SE7, btw. I used to hang out a fair bit here many years ago, but rented for 6 years until recently and so had little DIY to do.

You mean short the 24V RT pins? I've effectively done that outside the case by disconnecting and closing pins 2&3 (?) at the thermostat receiver when I was testing it. It still said gave an S30 status code :-(

Of course, one thing I have to do is keep the boiler running until Friday, which is when I've booked the Vaillant service for. I can't seem to find anything in either manual about how to configure that - I was going to set it to always on, and then set the timer to 30 on/30 off and reduce the...

Yep, you're right, I forgot I had connected the Hive during that process. It's been a long week. I'm going to just bite the bullet and have it repaired, and chalk this one down to experience. Really all down to my choosing the dual channel when I didn't need it, and not understanding the...

I would certainly not touch the gas or water parts. As for the electrics and electronics, I'd work around the latter, having school qualifications and a degree in that. Admittedly I didn't expect a low and high voltage mix up by changing one wire on an external, unpowered part, which is...

Thanks! Yes, again, I've not removed the boiler cover to check which side it's on, and I think it's better not to today judging by my day so far. Lack of sleep doesn't help my judgement right now. I would have taken a multimeter to it first to understand what was going on, but we've just moved...

It sounds like I'll have to take the cover off to have a look. I had assumed it would (and should) have been pretty simple wiring, something I'd done before with a Honeywell thermostat a while ago, but it sounds like the Single vs Dual Channel differences tripped me up. I'll take a look which...

Yeah.. well, I've not touched anything in the boiler, so I shouldn't have changed it from low to high voltage or vice versa. The fact it blew the main socket 3A fuse made me think it's connected to the high voltage side.

No, I haven't opened up the boiler yet. That's on the thermostat receiver mounted on the wall next to the boiler.

The timer on the boiler was always on; what I did, was press the two buttons at the bottom of the panel together in order to override the external control and turn the heating on continously.

Just an update - I removed the controller's panel and connected 3 & 4 together; the boiler still doesn't respond and still shows S30. :-(

OK - I might cross-post this into DIY Disasters, but I'll start here. I wanted to fit a Hive 2 controller to my Vaillant EcoTec 28, to replace the Danfoss RETB+RF that's fitted there. I had accidentally bought the Heating + HW Hive, despite only needing the heating control on my combi boiler. I...