Nickfromwales

Hi, and welcome aboard. Where is home for you then?

Is that a down pipe it eventually goes into, and is it metal?

Better plumber!

Common tbh. Water defo backs up and fills the combustion chamber. Loads of British Gas installs suffered from the connection (non return) of the condensate > soil pipes, mostly in cold snaps where the valve internals (massively reduced internal bore) freeze up. @LLL just cut or disconnect the condensate pipe under the boiler and let it drain into a bucket to get you back up and running Are you 100% sure this isn’t frozen? Or hasn’t been frozen and has now thawed out and cleared?

The VA service manual should be your friend here?

The rf controls are plug and play, with the windows addressable to open / close etc in tandem (or more) at the press of one button. Not seen 24v options but I’ve not seen every model / iteration. Velux tech should be able to give you concise information regarding which models / units can be manipulated the way you want them to be. Lots of options, so it may be advantageous to better understand what’s available so you can get the best results.

Glad you have a way forward. The 20a option is a perfectly good ‘way out’. If you’re the only person living there then it’s fine to deem yourself competent, but if you’ve family to consider then get a sparky in and enjoy the safety of knowing that the jobs been done to the current standard and tested accordingly. Better safe than brown bread. It’s not much money in the grand scheme.

Link Just get 28mm male > 1” bsp connectors to make these off in compression, if you don’t want to solder.

Big time doesn’t mean in pvc Heavy gauge conduit or galv trunking. What he said. First time I’ve heard of that cable tbh. Every day is a school day.

I was just wondering about needing a fire rating for the cavity, if attached, as on garages I’ve had to close the sides and heads of openings where there’s habitable spaces immediately off them.

The elephant in the room is that this is terminally ill though? If water / moisture are a constant then this’ll keep recurring. The only cure would be to replace the twin and earth with HO5 or 7, for a long term solution, and swap the metal boxes for PVC ones.

PVC trunking?

That one is DIY friendly and at a price even you’d like

Seems to be very few instances though? Ive been quite intensively ‘around’ a respected member of the STA and a major supplier (German gear) and I’ve not heard any of them over the years mention panels going en-flambé or DC isolators doing likewise. If these are disconnected under load then expect the worst, but that’s damage done in ignorance by dimwits or idle thumbs.

If one link wire is dead in the ring you can omit it and reduce the 32a breaker to 20a and run it as a radial.