[Crabby2004]

Dear Roger,

I've got two Tunze 6201 pumps that are not working. One doesn't work at all (propeller doesn't turn) and the other works intermittently. For the one that doesn't work at all, I've tried the powersupply with other units and the powersupply seems to be working. The pump hasn't been used much. The unit that works intermittently has a strange behavior when first turned on - it vibrates and stops at about 10-15 second cycles for a few minutes and then kicks on. So, as long as that unit is just "on" it works, but if the unit is used with a wavemaker it doesn't work since it gets stuck in the vibration behavior.

Any suggestions? I've taken the propellers out and cleaned them but that didn't seem to be the problem.

Thanks,

Jonathon