# One Thruster not working

**URL:** <https://discuss.bluerobotics.com/t/one-thruster-not-working/9339>\
**Category:** Blue Robotics Software\
**Created:** [March 24, 2021, 8:36pm UTC](https://discuss.bluerobotics.com/t/one-thruster-not-working/9339 "2021-03-24T20:36:22Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![gcelec](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/gcelec/32/2038_2.png) [@gcelec](https://discuss.bluerobotics.com/u/gcelec)\
**Post date:** [March 24, 2021, 8:36pm UTC](https://discuss.bluerobotics.com/t/one-thruster-not-working/9339/1 "2021-03-24T20:36:22Z")

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I’m trying to find out why QGC isn’t sending a command to thruster 3.  
ESC and thruster work if connect them to another thruster channel on the Pixhawk.  
I swapped out the Pixhawk in case it was a faulty channel but that didn’t fix it.

Is there somewhere in MAVlink Inspector where I can see the commands to each thruster?

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**Author:** ![williangalvani](https://avatars.discourse-cdn.com/v4/letter/w/6f9a4e/32.png) [@williangalvani](https://discuss.bluerobotics.com/u/williangalvani)\
**Post date:** [March 29, 2021, 2:30pm UTC](https://discuss.bluerobotics.com/t/one-thruster-not-working/9339/2 "2021-03-29T14:30:34Z")

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Hi!

Check in the MAVLink analyzer the message SERVO\_OUTPUT\_RAW. If servo3\_raw changes, it means it is likely a hardware issue. If it doesn’t, please check the SERVO3\_FUNCTION parameter.

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<div class="post-metadata">

**Author:** ![gcelec](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/gcelec/32/2038_2.png) [@gcelec](https://discuss.bluerobotics.com/u/gcelec)\
**Post date:** [March 29, 2021, 3:11pm UTC](https://discuss.bluerobotics.com/t/one-thruster-not-working/9339/3 "2021-03-29T15:11:33Z")

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Thanks @williangalvani - SERVO\_OUTPUT\_RAW was reading 0 so went to SERVO3\_FUNCTION parameter and saw it wasn’t set to Motor 3.