Does the manual override work? This indicates whether the timer on-off switch operates. Take a moment and rate answer:ĭT121 Manual All Intermatic manuals Intermatic does not show DT11 Intermatic shows the DT121 is no longer available If the display shows and you can set programs, then the battery is good. Fixya is always less expensive than a service call. For a price, expert works with you while you work on timer or any do-it-yourself project. 2) Contact Intermatic: 3) Take advantage of fixya expert assistance live. Additional resources: 1) Add a comment and I will respond. To save data, move RUN-SET slide switch to RUN position. You enter data using keypad, and then okay data presumably by pressing OK button. suggests that putting slide switch into SET position will display each setting in sequence. : Put RUN-SET slide switch into SET position to enter, review, or clear data Two categories of of data: set-up and programming. Instruction manual says timer displays prompts that guide through steps. So it is better to change data instead of clear all data. If you reset timer by holding down reset button and clear button, all programming will be lost.