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I really do not know if it can be repaired, looking at my old valve it does look possible for it to be dismantled (few screws to take off). Might be worth to just bit the bullet and fork out for a new valve. I do beleive the valve for the 16/22 electronic is hard to find whereas the valve for...

It won't be the mercury vapour switch from what you have described as this is used to detect the presence of the pilot before turning on the secondary solenoid on the gas valve which in-turn fires up the main burner. I would almost suspect the gas valve is the culprit. My old gas valve...

Try http://www.gasbits.com they list it for sale at £115 I recently got various spares for my engineer to fit on my 10-16 without an issue (gas valve, mercury switch) dispite being told that they were obsolete and needed a new boiler.

This may help you... I've recently experienced exactly the same symptoms as yours but mines a Netaheat 10-16. Gas valve replaced now the pilot will light up BUT the main burner takes around 3 mins to come on so now I need a new mercury switch as well! Although these parts are now obsolete...

Engineer came to change the gas valve, thought it was sorted when the pilot flame lit up, then approx. 3 mins later the burner lit up, the engineer says the mercury valve is on its last legs and needs changing too. I can't remember if this was normal or not before my boiler broke down, can...

Starting with the lowest price option first then I would certainly ask to check the pilot injector first before forking out for a new gas valve. I always like to be armed with useful information like this before being told it's the most expensive item that needs replacing (sorry no offence to...

Just checked out that the PCB should be fine, I get correct voltages from the gas valve terminals when switched on. So must be the gas valve or injector then as mentioned. The service was only done a few months ago from a southern electric gas engineer, from what I'd remembered the engineer...

Thanks for the quick reply, will get my multimeter on it now.

Hi there, new here 1st post. My boiler has decided to pack up for the first time in over 15 years, before I start I'll fully aware of dangers of working with this type of boiler hence will be calling a Corgi engineer in due course. However as like any other DIY'er I am keen to know roughly...