Vaillant unvented keep running out of hot water

Joined
20 Dec 2014
Messages
108
Reaction score
4
Location
Yorkshire
Country
United Kingdom
Hi guys I'm stumped never ran out of water before I have it on time periods but lately I keep running out every few hours and if anything we use less water. I can't seem to see any leaks, not sure what Is going on. Unless during the time periods it is not switching on. I have checked and the DHW is On auto. Can you shed any light guys
 
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