Tunze ATO failed

Sitting here in my living room, my tank sounded much louder than usual. I figured I may have to adjust the skimmer or drain pipe. I look inside the sump and my water level is a couple inches lower than it should be in my return section.

I unplug the ATO and plug it back in. It beeps, but no water is being pumped. Luckily, I had an extra metering pump on hand. Swap them out and all is well.

I just placed an order for another back-up metering pump.