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Would there be a way to test that? If they are what supply the display with it's temp, it seems relatively correct - if the heating is on it sits around ~45 constantly, once the hot water is turned on it raises over 10-20 seconds to ~85, and then once the boiler turns off, it slowly climbs down...

I have a Vaillant EcoTec 937 Plus boiler. A few days ago, it had blown it's 3amp fuse overnight, which I replaced. The boiler powered up fine, and happily supplied the house with CH. However, as soon as a hot tap was turned on, it cut off the gas after a short while. I called Vailiant for an...