Take the impeller out of the skimmer.
Check the magnet is not swollen or something is not stopping the impeller from spinning.
I had a similar problem with my RSM 250 skimmer.
The magnet swelled on the impeller and the bubbles were very erratic after that.
Check the magnet is not swollen or something is not stopping the impeller from spinning.
I had a similar problem with my RSM 250 skimmer.
The magnet swelled on the impeller and the bubbles were very erratic after that.