Ravenheat boiler warm water ?????

[testarossa67]

Hi ,
I have a Ravenheat RSF84E combi boiler that's 5 yrs old , found that when the central heatings on fine nice hot water BUT when it's just the domestic hot water its luke wam at best .
After doing some digging around i replaced the DHW sensor , but this hasn't made a difference .I have noticed that the radiators do get a bit warm when the tap is on although no real hot water is coming out of the taps , and wonder if this is related , done some more digging and think it might be the diverter valve .
If this is the culprit do i need to change the whole unit or is there a repair kit for the diaphram ?
All advice would be gratefully recieved
Thanks

 

[MUFC1999]

Not sure is this the one with the black microswitch that clip on top of diverter with a black and brown wires or is it the one with the black square box microswtich that sits on the end of the div valve, if its the latter of the 2 then yes defo can its a geononi valve and diaphragms stocked at local mercahants bout 5 quidish, if the 1st of the 2 when you ring ravenheat they say you have 2 get complete valve, however if you get a geononi one and unclip the spindle from diaphragm, then unclip the old diaphragm from the old spindle, and put new diaphram onto old spindle you can repair it, a little fiddley but will save on dough, as the only diff between the 2 is the length of spindle, diaphragms exactly the same