Thanks for your reply. I should be able to assist you further. Can you please email me at JASCO with the serial number of the J-815 and also are there any software driven accessories such as Peltier temperature controller, automated titrator etc.. that you might also need manuals for? My email is wkottkamp at jascoinc.com
Is the Peltier working properly other than just not heating well? If so it probably needs the actual Peltier element replaced since they wear out with time. If you tell me in which couuntry you are located I can get thr right person to assit with more details.