If the CH is on and I turn on the hot tap I get lovely hot water. I then turn off the hot tap and the CH does not come back on, if I again turn on the hot tap I get nothing. No clicks, no lights on the front, but I can hear the water flowing through the boiler.
However this only seems to happen when the CH system is up to temperature and pressure and works fine when the system is cold.
I've recently had the 2 diaphragms replaced.
Any help would be greatly appreciated.