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yes seperate pcb top right at the back. It was modified to help combat this fault and yes I used to work for vaillant.

get the store pump and store pcb changed.

It may not have been a big enough difference to trigger the fault 9. In any case boilers don't always act as they should according to the manual ! Poor circulation on most glowworm boilers gives a fault code which says NTC defective, replace ntc, check harness to ntc ! Im gonna stick with poor...

No not always, most boilers modulation profile is based on factors the software assumes about the system ie that there is a suitable flow rate through the heat exchanger and enough heat absorption to take away the heat. If the flow rate is too low the boiler can ramp up and hit a point of no...

why don't you contact sooey?? he's in your area i presume

not sure about remehas specifically but sounds like you have poor circulation

thats just daft though, outdated claptrap adding anything for hot water. High recovery cylinders and priority hot water is the way to go. Add 0kw for hot water. even if you did install the system in a traditional way, chances are that either a) there will be more than 4kw available to the...

as you know Kestons are rubbish, the new ones are no better. There are loads of boilers that use 80mm twin flue, if anyone you have had didn't know this then probably better to find someone who does, its not exactly a closely guarded secret. If you need the 55 kw output of the current...

most of the parts for these boilers are obsolette, servowarm went out of business years ago. If it needs parts its probably time to change it. Homeserve are a bunch of useless charlatans but I don't think they have done alot wrong in this case.

Well coming from another ex vaillant/glowworm engineer i can only assume you need educating on repressurising expansion vessels. In 4yrs I replaced 3. Have you looked at the label on an expansion vessel to see the who made it? You may find the same vessels are fitted in numerous different makes...

as dan said those things are sh1te. There's an oring in there that will prob be shot now. replace with a regular tail extension.

well you are not gonna find the fault with a neon tester. You need a multimeter. also have you checked the valves not just stuck?

Funny how when its a repair your the only one who can do it, and now its a recommendation everyone agrees with you. must be amazing to be you Tony!

no as long as you have isolated and drained the water its a doddle

sounds like the plate heat exchanger is blocked or restricted, likely because the system is dirty.

its ancient, its failing, it was never a good boiler when it was new...skip it.

do we know what boiler it is yet? im gonna guess vokera compact if not

if you have good flow and pressure than an unvented boiler might be a better option. would not have a 937 personally.

sorry mark, i cant agree, the soldering is amateur, the flue is worrying. There is absolutely no need for duct tape on a modern flue. Also you should be using flue clips which hold the flue tightly, not waste pipe clips. The flue will be wobbly within that clip, unacceptable. Phone Gas Safe...