Solar Hot Water Playing Up.

boam

Hi,

We bought a house in 2008 which had solar panels on the roof, solar Hot Water has been working fine (we dont have any instructions or anything) Since the other week, the water is not coming out hot just midly luke warm, even though we have had scorching hot days, i have just gone upstairs and felt the pipes going into the tank (i hope they are going into the tank!!!) and these are HOT so could it be a pump or temperature valve playing up?? as i said we dont have much paperwork but i have left the tap running and still lukewarm with no signs of heating up

Edit, just been upstairs again and there is a Green Grundfos pump that was making a slight rattle, and was extremely hot, i have turned all the solar off for the time being.