My Central Heating has sudenly stopped working, but the Hot Water is working fine. However, when the HW is asking for heat the CH works as well (as long as the CH programmer & thermostat are asking for heat). I've checked the CH thermostat and linked the wires together to check that it works OK and it does. I've put the them back now.
The system is about 13 years old, an Apollo boiler and a 3 port Drayton Flowshare motorised valve.
I suspect the problem is in the MV as the CH works as long as the HW is asking for heat. Trouble is we're going to get very hot water. Can anyone advise please?