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if u feel confident enough to try you can remove the front cover to gain access to the inside of the boiler housing you will find the electrical control wiring box (please make sure you isolate the boiler from the supply point first) then remove the cover on the wiring control box by removal of...

the spark of an ignitor is normally a bright blue colour at the top of the spark generator which can usually be seen quite clearly so if you are seeing an orange type glow at the base of the igniter it may be that there might be a small gas leak at the base of the pilot assembly which could be...

it sounds like you may need your heating circuit flushed as there may be a blockage in the flow at some point otherwise try a new TRV

goto vaillant.co.uk and goto download manuals section and you can download your own manuals for any vaillant boilers

could anyone please tell me how to gas rate a combi boiler that is in the residential part of the property which is above a take-away,the only problem i have is that the gas meter is a G25 which uses 40 cubic metres/hour gas and the last part of the display counter only has two digits :?: