ESAM 5600 General Alarm error?

I have spent a day trying to figure whats wrong with my machine. As soon as it turns on General Alarm displayed cleaned out the machine still same error. Then took it apart wound up the transmission back up as fuser was at bottom of machine, powered it up again. Came back to life fuser went to the bottom heard a click and same error. I have looked inside tested thermal switches both ok. What else could be the issue thanks.