time clock failure?

optima 901 will run for weeks ok, then forsome unknown reason without a mains failure, the timer clock returns to showing all zeros and flashing. loosing the pre-set programs, after resetting the clock, it will probably run ok for days or even weeks before showing all zeros flashing again. Please help. mike.adamson`1944@btinternet.com
Mike Adamson, January 2006


done
renault scenic 2003 new shape clock wont keep its memory or does trip computer hold its memory

neil, June 2010
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