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Valliant boiler problems continues?

i have now changed the lead from the gas valve to the pcb, and still it is not firing up.... any other ideas why this could be so? this boiler is a nightmare...

pcb gas valve and lead changed
jas, August 2008
Hi. I have only just seen your problem & don't know the full history so I may be covering old ground.
This could prove anoying having replaced such expensive parts already but have you checked any limit or overheat stats. If the overheat stat has gone then your boiler will not fireup. Some boilers wont go at all others may reach as far as brining on the fan but go no further.
Also checking that the sytem pressure is correct for operation or a fault on the system pressure sensor.
Hope this helps

Robin S, August 2008
link Click here to see other fixes for Vaillant.