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I just updated the link to the right video. For the diverter valve possibility, we don't get hot water mixing in when heating is on. For crossover, is it possible to have intermittent crossover? Would that lead to a fault condition and the boiler stops heating?

Hi, I have a Vitopend 100 combi boiler. In the winter we have an issue where the hot water cuts off intermittently, for example during a shower, or at the kitchen sink. I have attached a link to a video which shows the front panel of the boiler as this occurs. The boiler is working fine...