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It is just possible that it is residual air left in the system (probably due to a poorly designed system - particularly main delivery pipework 22mm stoof) Other than that the whole system needs checking over by someone competant - good luck findin one a them!!

I suppose the press relase valve is not leaking?

Let us know if this replacement works!!!!

What is the best method of checking and inflating pressure vessels in respect of combi boilers? What is the ideal pressure Bar/psi? Personally I use a manual car tyre foot pump with a guage incorporated. I over inflate to something like 1.5 bar then using what I hope is a more accurate...

Vaillant. I used to think it bad that they made so many of the parts incororated themselves - but the parts ( and the boilers) just don't wear out just the rubbers! Vailllant are very understaffed so getting them out except to a new boiler aint easy to say the least

Cleaning the pressure release valve's seating arangements can usually make it water tight once again Then never use it to release water, as crap floating around the system can bridge the seal once again.

Also you will find a better heat output with the stainless sardine tin replacement

Just found a dead nothing working water or heating Biasi year 1999 model 24 S I have not yet had the bonnet up just waved a power pen over its power cable. Anyone have any immediate ideas?

Pompy What have you done about the local chalk in the water - Portsmouth is very chalky? Magnets tend to work well and are worth having

Can't beat good old British designed gear - designed on the back of an envelope in a tea break!

could be the hot water side of your shower is filled with muck. One assumes that you are using a bath tap /shower mixer tap?take off hose/shower head check flow and do the necessary

Without a doubt cleaning the heat exchanger would be a very positive move particularly in the Portsmouth area which has a high chalk level. The exchanger should be of the sardine can type much easier to service than the previous used exchangers ( large bakalite exterior jobie)

Skinflints Now aint that the truth!!

I'm with Slugbabydotcom but then we can both keep our home boilers ticking over for peanuts you may not be in this happy situation ! In which case I would suggest getting your system flushed and and have your system checked out for design failings - pumps that suck air etc etc and etc - then...

try borrowing a freezing pack or renting.

What is the secret of unstiffenening single lever Ceramic taps? Some times more or less virgin tapes become very stiff through lack of use what is the secret method of freeing them up?

Local branch of "The Plumb Centre" will fix you up with parts at competative rates usually cheaper than buying online or otherwise. Other than rubbers these boilers Never wear out. Most everything on them can be Cleaned up and rejuvinated!

You could try cleaning the nylon hot water inlet filter. It is possible that the Hot Water Heat exchanger is cruddy (It may be the original type and not the sardine tin ) A number of things to check out

maybe not!

What was wrong with the fan? ?How did you fix it?