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Thanks for your help. My other half has just reminded me that we are still under guarantee, so someone is coming tomorrow. Thanks,

I have a Bosch Worcester Greenstar 24i junior. Central heating is working fine, but not hot water. It is luke warm. I have diagnosed fault as the Diverter Valve Assembly. What it does not tell me in my manual is how to drain the boiler so I can replace the part. I would appreciate your...