Hi, I flew my plane with rcb7x radio.  After the landing, the motor started beeping. Now the throttle channel is not working.  All the other channels work fine. I tested in another plane. Again the same thing . Motor constantly beeping.  Not able to figure out is it the transmitter or receiver problem
Please help.

The channel 3 in not working  

If other channels are working, you can reassign channel 3 to a aux channel and then see if the motor has the same issue.

Normally when there is an issue it affects the entire receiver rather than just one channel

Hi, I have checked the throttle plugging into other channels. It works. Only problem with throttle. Currently I have assigned rudder to throttle channel.

May be the throttle gimbal potentiometer failed

May be the throttle gimbal potentiometer failed

Currently I have interchanged channels with aux.

@Santosh, the potentiometer is working fine