The manual says that the flashing red led could also mean that the neutral throttle value stored in the esc is diffrent from the value stored on the transmitter. So I recalibrated it. Didn't fix it. But I did notice that the Servo wasn't centering correctly. First it didn't center, when I would try to trim it, after a little bit it would center to where ever I set the trim. So this means it's probably the radio system, right? I'm at my family's summer cabin right now, so I can't try a diffrent radio yet.