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You, sir (..or madam?!?) are a saint :D Decided to service it myself, as per the manual's instructions. All burners and heat exchanger brushed and hoovered, probably cleaner inside now than it has been in at least a decade :oops: et viola! Now works perfectly - fires up nicely...

Thanks for the quick reply! That's reassuring, but could you elaborate - what do you suspect is causing the fault?

Hi there. Just joined the forum looking for advice about our ageing Vaillant Combi (VCW GB 221 H) Recently we've had trouble with the pilot light going out and being very difficult to relight, so I changed the thermocouple, and it now seems to stay on fine. However... Now, when the...