what for?
diaphram/microswitch/divertor, replacement dependant on model.just because its a combi does not mean its gas related plumbers can repair boilers too as long as it does not involve the gas/combustion process.
you are not familar with the vokera range then, check out the older models and verify its operation modes.you will see that i included DEPENDANT ON MODEL,perhaps a trip to specsavers may help with the reading tony.
If ch does not work either, it probably isn't a diy job.
If the boiler hasn't been serviced for more than a year, you should get a RGI to sort it out any way.
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