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So a response here - thanks for the help! All that was needed was a turning off of the fuse and back on again for the whole property and voila, everything is functioning normally again. Any idea what this could of been? Seemed pretty random. Also is it normal on the Vailant boilers that the...

Anyone able to respond to this? I have turned the boiler off and there is no hot water or central heating on so therefore no energy being used even though the lights denoting HW/CH Boost are still on. Is it usual for lights like these to remain on to signify a fault? I'm really hoping it's...

Would it look like a square white box that says FUSED on it with a circular battery or fuse that comes out of it?

Not sure. I turned off the boiler at the main knob to 0 and the hot water has stopped as it came out as cold which means immersion is not on or anything now. Where is the fuse located? On the panel itself or in the Honeywell junction box? Ok I will try turning off main fuse and then on...

Adding picture showing (badly) the blank screen and two green lights lit up for CH/HW boost on: https://ibb.co/g78hDPD

Hi all, Random event occurred yesterday when at around 1830 the water came on for heating as per normal schedule and then seemingly the heating as well at around 2000. However upon checking at around 2100 the console that controls this programme on the wall seems to have gone blank (i.e. no...