Try removing battery, and then reprogram timer.
Some timers are reset when battery is removed.
Newer digital timers keep programs in memory when battery is removed, but in that case the instruction manual shows steps for resetting timer and deleting programs.
The HB88RC manual does not show steps for deleting programs or resetting timer.
http://waterheatertimer.org/Intermatic-timers-and-manuals.html#hb88
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