Baxi 105e instant DHW weird fault

Joined
22 Dec 2005
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Location
Lincolnshire
Country
United Kingdom
Boiler has recently started playing up now and again. If one of us has a shower, then we can not get any hot water for around 30 minutes or so.

All the temperature lights are lit, indicating the water temperature is 80+ degrees, but it's cold at the tap. When it's showing all these lights, the boiler makes a noise every couple of seconds which I've not heard before.

It has had recently a new diverter valve diaphragm (though this isn't a likely cause anyway).
I've attached a quick video to show the noise.

I turned the boiler off at the wall and then ran the hot tap for a minute or so, and this allows the highest two lights to go out when the boiler is turned back on.

Perplexed! Any ideas anyone?
TIA Dunk
 
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