I have a gloworm boiler 1987 fitted. the radiators have individual TRV valves, there is no room thermostat, there is a Danfoss timer that switches the hot water or CH independently. The problem is the CH wont come on unless the hot water is switched on and the hot water tank thermostat is turned up above the temperature of the water in the hot water tank. The system gets us through the winter but the CH wont work independently of the hot water system. I have changed the Danfoss timer unit, the boiler thermostat, hot water tank thermostat also the three port valve is fairly new as well. The hot water heating works ok during the summer when CH heating is not required and the radiators do not get hot.
Any ideas any body?.
kevin.
Any ideas any body?.
kevin.