Recent content by Lenihan

Hi Stem, thanks for reply. The system was new in 2009 and has always worked fine. I believe the ZA5's are 2 port and for heating only and there is a Honeywell Motorized valve for hot water. Test done and it appears to be working as it should. I gave the two valves a vacuum and a gentle tap...

Hi, I am hoping someone may be able to throw some light into what might be causing the problem with our central heating system. I have a two zone central heating system (house plus annex). We have two heating thermostats, one in each zone, two Drayton ZA5 actuation valves, a Megaflow system and...