I have just had a Ecotec Plus 618, VR65 and Unistor retrofitted into an S Plan system, controlled by a VRC 430 weather compensator.
The installer has set the diverter valve on the boiler (diagnostic level d70) to the mid-position, enabling simultaneous demand from both heating and water.
However, if the cylinder is calling for heat (i.e. cylinder temp is below target temp) during a programmed 'dhw on' time window, there is little response from the boiler unless I manually force the heating on (from 'auto' to 'manual').
Otherwise, the boiler goes rapidly from s24 (cylinder charging, burner on) to s28 (anti-cycling) and doesn't charge the cylinder.
Likewise, in the evening (when both DHW and CH are programmed on), the heating won't start firing (s4) until the programmed DHW window closes.
What's wrong here? It seems to me that only one of DHW and CH can be charged at any one time, despite the correct d70 diverter valve setting of 1 being set at the boiler.
Both CH and DHW zone valves seems to be wired correctly at the VR65, as does the cylinder NTC and boiler-VRC430 ebus connections.
Simond, Gas4You - help please! Installer is coming Monday.
The installer has set the diverter valve on the boiler (diagnostic level d70) to the mid-position, enabling simultaneous demand from both heating and water.
However, if the cylinder is calling for heat (i.e. cylinder temp is below target temp) during a programmed 'dhw on' time window, there is little response from the boiler unless I manually force the heating on (from 'auto' to 'manual').
Otherwise, the boiler goes rapidly from s24 (cylinder charging, burner on) to s28 (anti-cycling) and doesn't charge the cylinder.
Likewise, in the evening (when both DHW and CH are programmed on), the heating won't start firing (s4) until the programmed DHW window closes.
What's wrong here? It seems to me that only one of DHW and CH can be charged at any one time, despite the correct d70 diverter valve setting of 1 being set at the boiler.
Both CH and DHW zone valves seems to be wired correctly at the VR65, as does the cylinder NTC and boiler-VRC430 ebus connections.
Simond, Gas4You - help please! Installer is coming Monday.