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Hi it could be one of a few issues.
The diverter valve could be stuck, the clock may be faulty, the pcb may be faulty
Hi, if it seems to be ok now, I would suggest using the boiler as normal again but if the problem reoccurs then get someone in to check those issues and maybe put you in a programmable room thermostat and bypass the boiler clock which can be unreliable.
Thanks for rating e.All the best .