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Not the best install but nothing obvious from your pictures apart from no auto bypass ? You need a route for the pump overun to circulate and displace the heat in the boiler when the 2 port valves close , you definitely should not need to have the immersion heater on 24 - 7 they are more for a back up should something fail , if I had to diagnose the fault I would start with checking the 2 port valve on the hot water system , check it is motoring open when the cylinder stat temperature is turned up and then down when the hive is in a hotwater call mode ? , next I see on the cylinder primary return has a balancing type valve this may need adjusting or even removing as it maybe the problem better to fit a lockshield type gate valve for balancing ? Few thing there for you to consider Margret . Please post your findings regards. kop
Hello King of Pipes, On Friday 26th May 2019, we switched off the immersion and tested with hot water (via the hive using status of 'always on') but to no avail, no hot water. The installer came yesterday (Tuesday 30/04/2019) and looked at the drayton cube and boiler, says can't seem to understand what is the underlying issue. The drayton connected to the hot water pipe next to the hot water cylinder was on 'B' with the black clip at the top lifted upwards.
The two pipes in the kitchen, original newly installed connected the boiler (2 straight - straws) was readjusted to now criss-cross? (see attached photos). Currently, the thermostat attached to the cylinder is set at 70 degrees. Hallway flooring was lifted to find pipe work.
At present, the Central Heating (CH) and Hot Water (HW) are both running, immersion switched off, the drayton valves not attached, all heaters turned down. The hot water pipe in air-cupboard is very hot, and the water is hot.
It seems that when the CH is on together with HW, there is HW and the water flows; but then when the CH is off and HW on only; the hot water reverses flow? Has anyone had this issue before?
Greatly appreciate anyone help?
Thanks a lot.