No real symptoms. I was using a 1.5 ohm coil at 10 watts and it started having a burnt electronic smell. Then it stopped producing. The indicator light would be normal for a couple of seconds then get brighter. Still reads ohms and such.
Luckily, with as much overtime as I've been getting at work(I install central heating and air conditioning), I was able to get a new
mod. This time I went with a Volcano Lavatube.
Forgot to mention. My VTR was five months old. Not too happy about the life of the unit for the cost. My lavatube has a 1 year warranty.