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You need standard 3/4 and 1/2 fibre washers for these joints. http://www.screwfix.com/p/fibre-washers-for-flexible-tap-connectors-pack-of-20/75601 http://www.screwfix.com/p/fibre-washers-for-flexible-tap-connectors-pack-of-20/93297 Screwfix opening hours are pretty good.

Cheers guys. I might as well give it it's own supply from the consumer unit seeing as I'm able to at this point. I've got plenty of spare 2.5mm twin and earth so I'll send 2-3 feeds through the boxing just in case, no worries if they don't get used. Thanks again!

Alright guys, just after a bit of advice on the above. I'm doing some building work at home at the moment and at some point in a few months or so I'll be getting an electrician to fit interconnected mains smoke alarms. I'm assuming one will be fed from the consumer unit and all connected...

Sure, I understand that. Even so, this could end up being the main heat exchanger which is expensive so I'd let Baxi take the hit.

I'm a little reluctant to give advice regarding this fault as it's combustion/gas related and any DIY jobs can be dangerous. I'd recommend getting Baxi (heat team) out to do a fixed price repair, they know this boiler/fault better than anyone.

The pump is part of the boiler so there's not much you can change about that. Those rads will need a higher flow rate than the 8mm pipe can provide, I'm sure they'll work but I doubt they'll get as hot as they should. Basically, they'll dissipate heat quicker than they're receiving it...

How old is it? There is potentially a list as long as your arm that can cause this.

Do you think your 837 is a commercial boiler???

What experience have you had with other combis / manufacturers? Or even other Vaillants? If it's only your own then how can you make such a sweeping generalisation? It makes no sense!

Read the sticky on DIY gas at the top of the list of threads. It could be very dangerous if you don't have a professional do it, not to mention expensive as it could be a miss-diagnosis.

Who checked the gas pressure? Sounds like you already know it's an ignition/gas related problem. You'll need to get a qualified engineer to take a look at it. Try calling the manufacturer and asking if they do a fixed price repair. I think there number is 01787 272800 but not sure. It's...

Vaillant are a top manufacturer and produce some great boilers. I've seen 100s, you've seen 1 (I assume) Sorry but you've been unlucky! Obviously there's a lot more to it than we can see in this thread so there's no point in speculating about the reasons. For any consumers reading this, I...

It needs an auto bypass valve and the pump needs to be wired back to the boiler as per manufacturers instructions. Also make sure it has a permenant L-N-E and a switched live from the wiring centre. Again - as per manufacturers instructions. If it's not done like this you can get problems and...

Ha you watch, the OP will turn around and say it was the PCB :D :D :D To be fair that's unlikely, we'll probably not hear back.

Yea very true. It's best to be as diplomatic as possible with any advice because there's always someone smarter just around the corner. It' takes a real nob for me to start slagging anyone off on here.

You don't mean me I presume?

Now now lads....

To be fair, this is probably the only range of boilers that I wouldn't give the same advice as you, Vicvapour. 90% of the time any other boiler would need a new board.

How many times have you replaced a PCB on this boiler for this fault?

It's fairly common for something on the low voltage side of the harness to give this fault, it could be the main PCB but it's just a likely to be the fan, pressure sensor, etc...