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Usually this is an indication it is dirty, there is a power overload as a result, are you sure there is no calcium deposits on the shaft and the hole in the middle of the drive unit? If it is clean, it could be a faulty power supply, do you have another one from another pump you could try?
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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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