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Thanks for your reply. I understand what you;'re saying about latency. That makes sense. However, the hot water control has been on minimum all day and still scorching hot and the room thermostat is also at mimimum and the radiators are still cranking at full power. So it doesn't seem to be to...

Yep will defo get it checked, as I said, just trying to see if any one has any experience of this so I might gain insight before I get an engineer out. (not instead of).

Yes the Diverter valve is inside the boiler housing. We have no loft (its rooms in roof). It is a combi (Worcester Greenstar Heatslave 18/25 EXT combi condensing). I would have expected the controls to work. Otherwise there is no way of controlling tap temp. As I mentioned the Room Thermostat...

Hi Tony thanks for the swift reply. Yes I've bought the house. Its an old cottage but the central heating is relatively young. No hot water cylinder. It has a Drayton Control unit LP722 on the wall which has a facility for hot water control / boost / timer etc which I guess is redundant and...

Hi. Just moved into a new cottage. Boiler fires up great and has the radiators and hot water pretty hot and quickly. I've realised though, that the controls don't seem to be working. 1) There is a room thermostat, which does click on and off but doesnt seem to affect the boiler in any way. I...