Are you talking about the Intermatic digital timers? I have used them since 03' on my sw tank with few problems. They use a triple A battery, so when it runs out or it gets near time for the battery to run out they act up a little. I just pop in a new battery and we are good for another 5-6 mo or so.
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Orlando from GLA has class! 
Keep smiling~ Carole
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