FPV Drone Does not Arm? Let’s Troubleshoot and Repair it.

In the event you’ve ever confronted the irritating concern of your FPV drone refusing to arm, you’re in the proper place. I’m right here to information you thru troubleshooting and fixing this drawback, particularly in case your drone makes use of Betaflight firmware. By understanding what prevents a drone from arming and studying easy methods to diagnose and repair these points, you’ll be again within the air very quickly.


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New to Betaflight? No worries—right here’s a tutorial to get you began on setting it up for the primary time: https://oscarliang.com/betaflight-firmware-setup/

The First Issues to Test

Alright, let’s dive into the primary steps to diagnose why your drone isn’t arming.

Unplugging USB Cable

Betaflight has a security function the place your motors received’t spin up if the flight controller is linked to the configurator. So, disconnect the USB and provides it one other go.

Radio Receiver Test

Guarantee your radio receiver is certain and dealing appropriately in Betaflight. Head over to the receiver tab to see if the channel responses match your stick actions appropriately. Oh, and ensure you’ve received the newest Betaflight configurator downloaded: https://oscarliang.com/download-betaflight-configurator/.

Arm Mode Task

Did you assign a swap in your radio for ARM mode? It ought to mild up yellow when activated, signaling every thing’s set appropriately. Undecided how to try this? See my tutorial on establishing Arm swap: https://oscarliang.com/betaflight-modes/#How-to-Setup-Arm-Change 

flight modes - acro mode, horizon mode, angle mode

Nonetheless no luck? Let’s dig a bit deeper.

The right way to Test for Arming Points in Betaflight


In the event you’ve received Betaflight OSD, allow “Warnings” in your display with “Arming Disabled” chosen. It’ll provide you with clue on what’s stopping the drone from arming.

You don’t have Betaflight OSD? There are different methods to test for the “Arming Disable Flag” in Betaflight, let me clarify.

Betaflight Configurator

You probably have entry to a pc, you’ll be able to simply test the Arming Disable Flag within the Setup Tab within the Betaflight configurator.


Alternatively, you’ll be able to test within the CLI by getting into the command “standing”, the final line is the checklist of arming prevention flags.

Additional Studying: The right way to use CLI in Betaflight?

Buzzer Beeping

In the event you don’t have a pc, however your quad has a buzzer, the beeping also needs to point out the disarm flags. Right here’s easy methods to decipher the beeping sample:

  • 5 quick beeps for simply consideration, which could be ignored
  • Quite a few lengthy beeps
  • Quite a few quick beeps with lengthy intervals

Every lengthy beep represents 5, whereas every quick beep represents 1. The ultimate flag quantity could be calculated as 5 x <the variety of lengthy beeps> + <the variety of quick beeps>.

For instance:

  • 0 lengthy beep and a couple of quick beeps = 2
  • 1 lengthy beep and three quick beeps = 8
  • 2 lengthy beeps + 0 quick beeps = 10

Arming Prevention Flags Lookup Desk

When you’ve discovered the arming disabled flag numbers or names, match them with this helpful desk to decode the problem. The information is from the Betaflight wiki.

Title Description Beep code Required Actions
NOGYRO A gyro was not detected 1 You will have a {hardware} failure, if a earlier firmware model works then it might be a firmware concern. Otherwise you may need flashed a flawed goal.
FAILSAFE Failsafe is lively 2 Rectify the failure situation and take a look at once more.
RXLOSS(1) or RX_FAILSAFE No legitimate receiver sign is detected 3 Your receiver is both defective or has no hyperlink to the transmitter.
BADRX(1) Your receiver has simply recovered from receiver failsafe however the arm swap is on 4 Change the arm swap off.
BOXFAILSAFE The ‘FAILSAFE’ swap was activated 5 See FAILSAFE
RUNAWAY Runway Takeoff Prevention has been triggered 6 Disarm to clear this situation.
CRASH Crash Restoration has been triggered 7 Disarm to clear this situation.
THROTTLE Throttle channel is just too excessive 8 Decrease throttle under min_check.
ANGLE Craft isn’t degree (sufficient) 9 Stage craft to inside small_angle levels (default 25).
BOOTGRACE Arming too quickly after energy on 10 Wait till pwr_on_arm_grace seconds (default 5) have elapsed.
NOPREARM Prearm swap isn’t activated or prearm has not been toggled after disarm 11 Toggle the prearm swap.
LOAD System load is just too excessive for secure flight 12 Revisit configuration and disable options.
CALIB Sensor calibration continues to be ongoing 13 Watch for sensor calibration to finish.
CLI CLI is lively 14 Exit the CLI.
CMS CMS (config menu) is Lively – over OSD or different show 15 Exit the CMS (or OSD menu).
OSD OSD menu is lively Exit OSD menu.
BST A Black Sheep Telemetry machine (TBS Core Professional for instance) disarmed and is stopping arming 16 Consult with the guide on your {hardware}.
MSP MSP connection is lively, in all probability by way of Betaflight Configurator 17 Terminate the Betaflight Configurator connection (disconnect).
PARALYZE Paralyze mode has been activated 18 Energy cycle/reset FC board.
GPS GPS rescue mode is configured however required variety of satellites has not been fastened 19 Watch for GPS repair, allow arming with out GPS repair, or disable GPS rescue mode.
RECOVERY (wiki incomplete) (wiki incomplete) (wiki incomplete)
RESCUE_SW GPS Rescue swap is in an unsafe place 20 Flip off the GPS Rescue swap to arm.
RPMFILTER(2) Motor RPM-based filtering isn’t functioning 21 A number of ESC’s will not be supplying legitimate RPM telemetry.
REBOOT_REQD Reboot required 22 Reboot the flight controller for settings modifications to take impact.
DSHOT_BBANG DSHOT Bitbang isn’t working 23 (3)
NO_ACC_CAL Accelerometer calibration required 24 Calibrate the accelerometer or disable options that use it
MOTOR_PROTO ESC/Motor Protocol not configured 25 Choose the ESC/Motor protocol to make use of on the Configuration tab.
ARMSWITCH Arm swap is in an unsafe place 26 Toggle the arm swap to arm.

Different Widespread Points

If Betaflight reveals no arming disabled flags, the issue could be one thing else. Listed below are a couple of extra issues to test:

Accelerometer Points

If the Most Arm Angle in Configuration tab is about under 180 (default worth 25), your quad have to be beneath this angle with a purpose to arm. In that case, guarantee your quad is on a degree floor, and calibrate the ACC on a degree floor.

If you want to have the ability to arm the drone regardless the angle it’s in, you’ll be able to disable Most Arm Angle by getting into 180. Some individuals desire to do that because it permits them to arm the quad when they’re caught in bushes and so they would possibly be capable of shake it out. However clearly this might be a security concern, so do that at your individual danger.

A defective accelerometer may additionally contribute to the problem, strive disabling accelerometer within the Configuration tab for those who don’t usually fly in Angle/Horizon/Rescue modes.

CPU Utilization

When CPU load is just too excessive, Betaflight will refuse to arm. Yow will discover out the CPU load on the backside of Betaflight Configurator.

Maintain the CPU load under 80% (since BF4.3) by adjusting settings, equivalent to reducing PID loop frequency, and disabling pointless options equivalent to LED and tender serial.

Throttle Points

Guarantee your throttle is appropriately calibrated. When your throttle channel’s lowest worth is just too excessive, Betaflight will refuse to arm. Ideally your channel endpoints must be 1000 and 2000. 10-12 under 1000 and above 2000 is often effective, equivalent to 988/990 – 2010-2012, however positively not above 1000 and under 2000, that’s unhealthy, by which case you would possibly need to calibrate your radio endpoints.

Betaflight doesn’t arm in case your minimal throttle is just too excessive (increased than the setting “Min_Check”). It is a security function in order that the quad doesn’t immediately spin up the motors and damage you when it’s armed. You need to make sure that your throttle is decrease than min_check when it’s within the lowest stick place. Min_Check is 1050 by default.

Moron threshold

Some FC may need extra delicate gyro’s and the drone would refuse to calibrate and initialize after energy up, and due to this fact you’ll be able to’t arm it. By enhance “gyro_calib_noise_limit” (initially often known as Moron Threshold) in CLI can scale back gyro sensitivity throughout initialization. Strive setting it to 100 and even 120.


I hope you discovered this information useful! Let me know within the remark in case your arming drawback was attributable to one thing else that wasn’t coated on this tutorial. In case you are nonetheless having issues arming your quad after following this information, please put up your query on our discussion board, our group is all the time right here to help and be taught collectively. Pleased flying!

Edit Historical past

  • Jun 2018 – Tutorial created.
  • Feb 2024 – Up to date.

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