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The problem is with the boiler itself in virtually all cases, the vito cell is merely a heat exchanger.
It is most likely an electronics failure issue in the boiler, 99% of the time nothing a home owner can rectify themselves, but we can take a look at it if you can get me the model number of the boiler itself.
This is quite likely to beyond any normal persons repair capability, it is very rarely a simple reset issue, once I get the model number we can look those options over.
The company charges extra for phone calls, it will be best to wait on that unless you want to spend the $20, in that case I am submitting that offer.