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Rainbird ESP Timer Alarm LED light stays on

Our Rainbird ESP Timer has been working fine until several months ago and the red Alarm light stays on. I "reset" the system and the light goes off, however, after checking several hours later, the Alarm light comes on again. So, our lawn is not getting watered. We inherited our system when we bought the home in 2008, so not sure when it was installed but we have had it checked by liscensed technicians in the past when we wanted to get our water schedule on track. This is the first problem we have had. I replaced the battery (backup) recently, as the old one was dated 2007. Any ideas as to what would cause the Alarm light to stay on? Thanks Jacqueline Campbell

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