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Update. The installation manual left with the system was for the VCW-Sine 18 however old service invoices etc show the model as VCW-242. Apologies for the misinformation. My sister has found a local engineer who didn't turn on his heels when she mentioned it was a Vaillant and he is going to...

There was a new fan fitted around January but afaik it has worked perfectly since then until last week. I think it is around 23 years old but it would be a shame to replace it because of a £20 part.

Hi, my sister has one of these boilers and Vaillant have now stopped supporting it. It has just developed a fault where it will not fire up reliably. When CH or HW is requested the main burner doesn't always light. When I looked yesterday it took 2 attempts ie the main burner lit then went out...