I'm having this same problem. after 4 hours the chlorinator stopped, but my display shows 4 hours again, and just the pump LED is lit. I don't need it to run 8 hours a day right now. We aren't even in the pool at this time. Did you ever find a solution to your problem?Start the pump at 8 AM. 4 hr run. Its 2:30 and still going right now.
Moved from here.
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