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Thank you both. Is it a DIY? Do you know if there is any guide/tutorial video on youtube?

Hi all, I came across this forum while trying to search for an answer with an issue with my boiler. I have Worcester Greenstar 15Ri boiler, Grundfos Alpha 2 pump. I have an Hive thermostat which I use to schedule hot water/heating, or to manually switch on/off heating/hot water. For past...