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Thanks again - Sorry, yes the motorized valve is definitely a 2 port! It is connected to a pipe which feeds from the cylinder, albeit it is some distance from the cylinder. It also has an electric cable going to the pump. Something else I realise I'd forgotten to mention is that, on the...

Thanks again for assistance and apologies for delay in replying. There is one motorized valve and it is a SUNVIC. I think it is a 2 port but not sure.

Thanks for input - Even with the CH at the off position, if the HW is set at timed both the boiler & the HW light switch on & off intermittently outwith the set times. I can only control it by keeping the CH on timed and the HW at off.

Hi there It's a GREENSTAR 24 Ri

Had Worcester Bosch boiler installed recently. Also a Drayton Digistat + RF Wireless System Room Thermostat. Didn't have room thermostat before. Programmer wasn't replaced it is an acl Lifestyle Model LP 112. Both the HW and CH on the programmer are set to come on twice a day and do so but...