Key Functions and operation instructions check parameters setting the Press A key and release it immediately to display the set state of maximum value: s v key and release it immediately to display the set minimum value;Press "Set and release it immediately to display defrost cycle; Press "Rst key and release it immediately to display defrost time, seconds later, screen back to display current temperature. To modify the parameter setting mode: Press "Set" for 3s to enter the parameter adjusting mode. and set indicator light on. LED displays the parameters adjusted last time. Press A or choose desired parameters. After the selection of parameters the value of corresponding parameter is displayed by pressing "Set Press Set, and A or v simultaneously to adjust the value of parameters; Press "Set", and hold on Aor for more than 1 second to quickly increase or decrease the parameter value; Press A or to alter other parameters after the setting of one parameter value. Just repeat the above-mentioned steps value and back System will save the modified parameter the normal working status if pressing the "Rst" key or no key operations in 30s. Manual defrosting time value Manual defrosting is allowed when defrosting is not set as "O Under non-defrosting status, press Y key for 3s to start up the manual defrost. for 3s to stop Under defrosting status, press key defrosting