First check the fan and make sure it spins freely.

Hold the plane firmly in your hand and move the throttle with the other.

Does the fan run at all throttle settings this way?


Also did you "calibrate" the throttle?

e.g. turn on the TX, and move the throttle all the way up.

While holding the plane, plug the battery in quickly and bring the throttle all the way down.

It may be that your ESC has lost throttle calibration.


To isolate the problem and find out if it is the receiver, move the throttle to another channel temporarily... say the elevator BUT BE SURE that you secure the elevator all the way down and hold on to the plane when you plug it in, so it doesn't take off on you!

See if it works normally this way.


Insufficient current from the battery can also cause the ESC to cut power just as you are experiencing.

Is the battery balanced and fully charged?

Have you tried a different battery?