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Thanks. You're right, muppetry was involved! Heating now fine. Hot Water seems to run if heating already on, but not otherwise. Q?- The needle from the diverter valve extends far enough when 'Call for Hot Water', but misses the microswitch, passing to one side. Is there something missing from...

I have just done all the donkey work then paid a Corgi Registered Plumber to do gas connections and commision my new Sime Boiler. Problem is, there is no DHW flow and it is baffling us both. Gas has been checked and Diverter valve cleaned (although as it is brand new I cannot see how it can be...