I too have recently had problems. At first thought it was a switch, and received one under warranty. It wasn't the switch.
The light works, but goes off when I try to raise/lower.
I found at least 1 crimp had failed, but even that wasn't the complete fix. The fuse looked burnt but tested good.
Received a new power head last week and will change them this week... weather permitting.
The manual way works fine, I'm glad the crank is included too. As someone else mentioned with an extension the tank cover does not need to be removed...