Okay, so I got a a circular saw from the family for Christmas for my burgeoning woodworking hobby, and I've been using it a light amount. It went out the other day while cutting some 1x4. I had a little kicking while sawing through, but not too bad. Suddenly, the saw whirs down and dies. I think the battery is dead, so I switch. No good. I test with my drill, the batteries are both fine.
I've disassembled it fully and put it back together, verifying that there's no blockages, I can manually turn the spindle. Additionally, I've tested the circuit, and there's the ~18v getting from the battery to the spade connectors on the motor, but when I pull the trigger nothing happens. No sound, no motion, nothing.
The only thing in the saw I couldn't identify is some kind of square plate that rests abutting the motor housing. My suspicion is that it's a temperature sensor?
Anyone got suggestions to figure out what I need to do? It's a DCS391 model circular saw.