Are you sure there is no lit redstone to the reactor?
Lit redstone sets the reactor to off (sorry for the trivial question, but It's often something silly ^^)
Yep the reactor has redstone but it was off meaning the reactor was on, i setup redstone torches for on/off indicators :). Anything else that might be an issue?
Hey there, well i just finished building my second reactor, which will be a breeder one, and then i copied the one you posted here, i managed to get it to 9500 heat but i dont know why when i put the breeding configuration it starts cooling itself i dont understand please help me!!
I also have the same problem. Do you see progress within a few minutes? Even still, the reactor won't stay hot 
Edit: can anyone help me with breeder issues? i followed Nargon's perfect breed design "mark X" built the chamber with 20 waterblock cooling and everythomg. I heat up the reactor using the heating config, then get it to about 9100 heat. Remove all but one uranium cell and 4 depleted cells. my problem is 1. i dont see any progress of the refurbished cells and the reactor keeps cooling down below 9000. what am i doing wrong?
