Check the manual for troubleshooting. Reset the unit too before setting it up again.
It says on the manual that the MC230CR can handle up to 20T motor limit. But mine always had problems of overheating and shuts down with 23T motors. Then after cooling it off for about 2 mins, it works back normally again. So I thought of a remedy and modified it. I first replaced all the stock wires, both motor and battery with 12 guage general wires. This will help absorb heat coming from the motor and batteries. Then I also installed a power capacitor and diode on the motor. Don't forget to disable the reverse function of the ESC. Otherwise, you will fry the diode. Just be very carefull when soldering the wires to avoid contact on each other. If you're not sure on what to do, let a pro do it for you. After all that procedure and modification, you're MC230CR will be able to handle motors up to 17T.