Thrusters not working when ROV is armed

[EliotBR (Eliot)]

Hi @ruthduncan, welcome to the forum

For the thrusters to suddenly stop working seems odd. A few questions:

1. Does each thruster still do all 5 beeps on startup? If not, do they at least do the first 3?

   @EliotBR

   The initial three beeps (rising in pitch) are the ESC detecting each phase of the connected motor.
   Once the phases are detected, the ESC initialises to arm itself, producing a low sound (when it detects a valid (1100-1900us pulse-duration) signal), followed by a high sound (when it detects a valid “stopped” (1500us pulse-duration) signal).

2. Can you check the SERVO_OUTPUT_RAW values from the MAVLink Inspector?
3. Have you applied a custom frame, or run any code that may have changed the motor functionality assignments (e.g. for controlling thrusters individually)? If so it may be worth resetting the parameters.