Older S4 timers with the 1x1 inch red and yellow buttons can have initial start up problems. The Red button wears unevenly in timers over 10 years old. The button then jams closed. The timer will put up a battery status message; batt 9.3 (or whatever the battery or power supply is) There is no recourse other than turning the timer off, wigging the Red button loose and trying again. We are starting to see more of these issues coming into the shop from 1999 S4s and older. The newer timers with the 1/2 inch square buttons do not have this issue. Older S4 can have their face plates upgraded to the current model too.
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