Intermittent hot water is cold

Joined
2 Dec 2018
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United Kingdom
Hi All
I have a Vaillant eco tec 615 plus boiler sealed system with a tank In the airing cupboard managed by a Hive thermostat and intermittently the hot water is cold when having a shower at 8pm ish. The times to heat the water are 0600-0700 1100-1130 and 1700 -1830 and it always worked ok before nothing has been changed.
I really dont know where to start diagnosing whats wrong, anybody got any ideas for me ?
Thanks
 
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