Hello,
I have just installed (myself) a 3 port valve fully pumped system at home, but when I switch on the CH the boiler only fires for around 15 mins before switching itself off
I have turned up the boiler thermostat but this makes no difference
the hot water circuit is working fine
is the most likely cause airlocks? I have bled all radiators
other possibilities:
I have wired valve/controls according to manufacturers instructions, which has included leaving out room stat as I have TRVs on all rads and making suitable wiring mod in wiring centre to compensate. The old system I replaced was odd (to me) and included a powered thermostsatic valve on the primary heating coil to the cylinder. the old controls could turn this valve on and off and the user set the temp. it had all sorts of balancing gate valves to provide a bypass, but when I modified the system I replaced all pipework to the cylinder for this three port arrangement. it has an air release valve in the relevant place, and all feed and vent pipes are correctly placed too.
Any ideas on what my next course of action should be?
thanks
Ben