I purchased the SmartKleen NC22 after opening my pool last spring. Had no issues with it last season until about two weeks ago. After it had completed its cleaning cycle, I wanted it to run another 30 minutes, I turned off the power switch and back on. The cleaner didn't move but the power light was on. I tried a couple times to power cycle it and disconnect and reconnect the cable, but nothing. I let it sit a couple hours, turned it on and away it went. Last week I put it back in the pool, turned it on, light came on, but no movement. From the reviews, it looks like this unit isn't really dependable past one season. I recently bought a Dolphin Supreme M5...going to try it out tonight. Good luck with your unit.