This Nomiku 10000 Sous Vide Immersion Cooker showed an error "Uh oh! Pump stopped or low water". I diagnosed a defective pump and replaced with a similar pump. (Topsflo TL-B10H/S)

This video shows how to open up the Nomiku and replace the pump. I also offer some tips on finding a compatible replacement pump. I found mine on eBay for $10US. Since this Sous Vide was discontinued and it's virtually impossible to find repair information, I hope you find this useful if you're trying to diagnose and repair yours.