Most digital timers suggest resetting as last-step effort to restore functionality.
This particular timer is reset by removing battery.
Try removing battery again. Otherwise it seems the timer has gone bad.
HB88RC is discontinued product.
Replacement is heavy-duty Intermatic HB800RCL 2-outlet or HB800RCH 1-outlet timer.
http://www.smarthome.com/25078/Intermatic-HB800RCL-Heavy-Duty-Digital-Appliance-Timer/p.aspx
http://www.smarthome.com/48715/Intermatic-HB800RCH-Outdoor-Digital-Timer/p.aspx
Less expensive and less reliable timer Woods 59403 with 1-outlet has quite a few 'timer won't work' questions on fixya.
http://www.amazon.com/Woods-59403-Heavy-Duty-Outdoor-Digital/dp/B002KS7EOK
http://waterheatertimer.org/Woods-timers-and-manuals.html#6-24
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