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It sounds like a sensor issue and not a pump issue, after 6 months there is a fair probability of enough mineral deposits on the sensor to render it blind, a couple hours in vinegar followed by a wipe with a soft cloth should get it back to normal operation.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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