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Rex series C100 Temperature controller. How to get into programming.
1) Press and hold set until AL1 appears.
2) Click the set button until LCK appears
3) Change the number to 0000 (unlock code)
4) Press and hold the side arrow and set button simultaneously until CODE appears.
5) Click the set button till you are in the desired programming menu.
6) To get out of the settings just let it time out.
*Some models have different unlock codes. 1000 and 0100 are used as unlock codes in some models.