Mamba Max Problem

[BL-Power]

I've got a problem with my MM ESC: When i wanted to go bashing this morning and i connected my battery to my Mamba Max, the 3 leds were flashing permanently and the "ring"-tone occured only one time instead of two times as normal. Everything is connected correctly, the BEC is disassembled and i'm using a 5-Cell battery pack instead. The Mamba Max just continues flashing its leds when i go on the throttle but steering servo in working perfectly.
Can anyone tell me what's wrong and how i can fix the problem!?