Firstly, we should judge the type of temperature controller This is T-506H temperature controller which works in defaulted constant temperature control mode Now, we should change to intelligent temperature mode Press and keep holding "â–³" and "SET"bottons for 5 seconds until "00" and "PAS" displayed Press"â–³" botton to select the password(default setting is 8) and then press "SET"botton into setup status Press ">"botton to turn to item F3 that means way of control, "0" means constant control, Press [â–³" to ajust to "1 " that means intelligent control,Press"RST"key to save the modification Now the chiller is working in intelligent temperature mode, Thanks. The video about temperature mode change: http://www.teyuchiller.com/Article/Howtochangeintelli_1_1.html CONTACT S&A TEL:+86-20-89301885, FAX:+86-20-84309967 SKYPE: teyuchiller Email:marketing@teyu.com.cn Website: http://www.teyuchiller.com