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Further investigation of the wiring revealed all sorts of issues. The programmer is a centaur c27 Neither the ch off nor hw off are connected There is a link wire in the programmer between the ch on and hw on so if I just put hw on then ch comes on as well. Time to get the person who...

Just done done basic checking tonight

Thanks mandate for a great reply. Clearly I need to do a lot of checks on the wiring which will take me a while. I'll report back with any findings

Update on my problem.. On the wiring to the room stat I have red on t1 , blue on t2 and yellow on t3. When I start the heating from cold every thing works ok for both ch and water, ie if I move the room stat high the led comes on and if I turn it down the led goes off. However , once the tank...

Yes I have a multimeter. I'll check it out and post back over the weekend. Thanks

I have had a new Worcester boiler and 3 way valve installed recently. Sometimes if I turn down the CH room stat the radiators still stay on. The room stat is a honeywell with an indicator LED and when I turn down the stat I notice that the led stays on but dims. Also noticed by chance that this...