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What happens to the Viessmann 200 if you fit it without weather compensation? Does this 'great boiler' suddenly start to dissolve or something? It's either a good boiler or is not regardless of the controls it's fitted with surely.

These I think will fit although I'm not aware of a CF55 model. http://www.boilerparts.co.uk/SparePartDetails.aspx?manu=IDEAL&partno=003248&app=MEXICO+2+BED+SLIMLINE+CF50+BOILER Part number 003248 BG part ref 341-243

Sorry forgot to add tell British Gas to f**k off!

http://www.pipecowl.com/ Get one of the above in 15mm. Cut pipe inside building. Enlarge hole through brick work to around 22mm. Stick a new pipe through wall with new pipe cowl on end until it just appears on outside wall. Reconnect inside building.

Thanks for pointing that out John I wondered were all that sand was coming from.

The Viessmann Vitodens 100 series come with five year warranty as standard regardless of who fits it. It's their 200's that require a Viessmann trained installer to extend the warranty from three to five years.

Pilot assembly probably needs a clean. It will require gas connections to be broken so it may not be something you'd want to do yourself.

The Ideal Minimiser is considered by some to be one of the worst boilers ever produced. Some may even go as far as to suggest that Ideal boilers in general are not fit for purpose. As for me I couldn't possibly comment but I would not be throwing too much money at the Minimiser to keep it going...

Assuming the boiler wasn't on when you went out it could be a couple of things. If there is evidence of water in the warning pipe I would probably be taking a close look at the pressure relief valve as this could be letting by. If someone in the past has used this valve for draining the boiler...

If you want to try what MrV has suggested then the pipes can be identified as follows. Start at the pipe in the middle. Should have a yellow lever on it. That's the gas. Two pipes to the right. That's the CH return. Two pipes to the left of gas. That's the CH flow. Top it up to around 1 bar...