I've had this ProVari for less than a month now, and within the last 2 weeks I've had constant E1 errors and I cannot for the life of me figure out what's wrong. The Cart I am using right now (producing an E1 error) is only like 4 days old and the E1 errors are random. This has happened with my last 2 carts (abnormally short lifespan). I've found that it happens if I have the cart screwed tight, if I loosen it the E1 error is less likely to happen. My resistance readings are all over also, 2.9 (normal) to 2.7 all the way down to 1.5 and LO readings (whatever that means, low ohms?). I don't understand and I'm not experienced enough to figure out the problem myself, so if anyone has any ideas or this has/is happening to them also please let me know, thanks!