Hi Alex. I had one of the orange-corded 240 Voltec units that stopped working but would work again if I reset the breaker. I left the cover off and it stayed working, so similar experience to yours. I replaced the circuit board with an OpenEVSE board and it has been working for 5 years so far.
If you want to try this route, Steverino put together a tuturial that you can find here in the forums, or maybe he can link it for you.
EDIT: Found the link top Steverino's post:
http://gm-volt.com/forum/showthread.php?25513-Voltec-240v-Conversion-to-OpenEVSE
If you want to try this route, Steverino put together a tuturial that you can find here in the forums, or maybe he can link it for you.
EDIT: Found the link top Steverino's post:
http://gm-volt.com/forum/showthread.php?25513-Voltec-240v-Conversion-to-OpenEVSE