ok I have a Potterton Mini Minder E (MM)to control when I want the water (DHW) and Central Heating (CH) on and off. A Potterton PRT100 Thermostat and a Myson MPE322 or MPE328 motorised valve (MV). The CH is switched off on the MM, however, when the timer for the DHW kicks in the CH comes on as well. The 2 lights for the CH and DHW on the MV are also lit up! If I select the advance option on the MM to switch off the DHW the CH turns off as well, also on the MV?! Ive tried resetting the MM but this hasnt worked. Not sure which one or both are broke or whether its something completely different. Help would be very much appreciated. Thanks.

Wayne, October 2008

I turned the thermostat down to zero degrees however the radiators still stay on? What do you think could actually be wrong with the valve? Thanks Iain, your help so far has been much appreciated.

Wayne, October 2008

what happens with the room stat turned right down?
if you get the same problem id say mv
if you get just hw then id say timer

iain, October 2008