What the problem usually means
If your Holy Stone HS175 motor not spinning after crash, the issue is usually mechanical damage, a loose connection, or a failed motor-control component.
A crash can bend a propeller shaft, jam the motor, break solder joints, or trigger a flight controller safety fault that prevents arming.
The good news is that many post-crash motor failures are easy to isolate with basic inspection and a few controlled tests.
Start with the simplest causes first, because a spinning problem is often not the motor itself.
Common causes after an HS175 crash
Propeller damage or obstruction
A cracked propeller, warped blade, or debris caught in the motor bell can stop a motor from turning freely.
Even a small impact can push grass, dirt, or hair into the rotor gap and create enough drag to prevent startup.
Bent motor shaft
The HS175 uses lightweight brushless motors that can misalign after a hard landing.
A bent shaft may let the prop move by hand, but it creates vibration and resistance that prevent normal rotation under power.
Damaged motor wires
Crash forces can tug the motor leads where they enter the arm.
If a wire is partially broken, the motor may spin intermittently, twitch, or stay completely still even though the drone powers on.
Loose connector or solder joint
On compact drones like the Holy Stone HS175, vibration and impact can loosen internal connections.
A cold solder joint or a disconnected plug can cut power to one motor without affecting the others.
Electronic speed controller fault
Each brushless motor depends on the ESC to regulate current.
If the ESC channel is damaged by a crash or power surge, the motor may not receive the proper sequence of signals to start spinning.
First checks you should perform
Inspect the propeller and motor by hand
Remove the battery before touching the drone.
Spin the affected motor gently with your finger and compare it with the other motors.
It should rotate smoothly with similar magnetic resistance; grinding, scraping, or stiffness points to physical damage.
Look for visible crash damage
Check the arm, motor mount, propeller hub, and nearby shell for cracks.
On the HS175, a slightly twisted arm can change the motor angle enough to create drag or cause the propeller to rub the frame.
Replace the propeller if it is bent or chipped
Do not test a questionable propeller after a crash.
Even minor deformation can affect lift, overload the motor, and make troubleshooting harder.
Matching the propeller direction and size is important because quadcopters use different clockwise and counterclockwise props.
How to isolate whether the motor or ESC is at fault
Compare the problem motor with the others
Turn on the drone and observe startup behavior.
If one motor never twitches while the other three initialize normally, the issue may be specific to that motor, its wires, or that ESC channel.
If multiple motors fail, the problem may involve the battery, flight controller, or a broader power issue.
Swap components when possible
If the HS175 design and your repair skill level allow it, swapping a known good motor to the affected location can help identify the source.
When the problem follows the motor, the motor is likely faulty; when it stays with the drone arm, the issue is more likely wiring or ESC-related.
Test for continuity and power
Using a multimeter, check motor lead continuity and inspect for shorts between wires.
A healthy brushless motor should not show an obvious short to the frame, and broken continuity often indicates a damaged cable or internal winding failure.
What to do if the motor spins freely but still will not run
If the motor rotates easily by hand yet fails to start, the issue is often electronic rather than mechanical.
The flight controller may be detecting an error and refusing to arm, or the ESC may be unable to drive the motor phase sequence correctly.
- Verify the battery is fully charged and delivering stable voltage.
- Check whether the drone arms normally and whether any indicator lights show an error pattern.
- Reset the drone and remote pairing if the system appears unresponsive.
- Inspect for hidden damage to the arm wiring harness after the crash.
When the drone needs recalibration
After a crash, the HS175 may need gyro or compass recalibration if the flight controller is confused by the impact.
Calibration will not fix a burned-out motor, but it can prevent the drone from refusing takeoff or compensating incorrectly during startup.
Place the drone on a flat, level surface and follow the manufacturer’s calibration steps exactly.
If the drone still shows erratic behavior after calibration, return to the motor and ESC inspection instead of repeating resets indefinitely.
Signs the motor is damaged beyond repair
Some crash-related failures are not worth repairing.
A motor is likely beyond simple recovery if you notice any of the following:
- Grinding that remains after debris removal
- Severe shaft wobble
- Burnt smell from the motor or ESC area
- Visible copper wire damage or melted insulation
- Motor that heats up quickly without spinning
These symptoms often indicate internal winding failure, bearing damage, or ESC damage.
In those cases, replacement is usually more reliable than repeated testing.
Safe repair steps for the Holy Stone HS175
Power down completely before opening the frame
Always remove the battery before working on the drone.
The HS175 has compact electronics, and accidental shorts can worsen the damage quickly.
Clean the motor area carefully
Use compressed air or a soft brush to remove dirt and debris from the motor and arm.
Avoid forcing the rotor, since brushless motors rely on precise spacing and magnetic alignment.
Reseat or repair loose wiring
If you find a disconnected lead or loose joint, secure it properly before testing again.
Poor repairs can create intermittent faults that look like ESC failure but are actually simple connection problems.
Replace parts one at a time
When troubleshooting a Holy Stone HS175 motor not spinning after crash, change only one component before retesting.
This keeps the diagnosis clear and prevents unnecessary parts replacement.
How to prevent the same issue after future flights
- Inspect props and motors before every takeoff.
- Replace any propeller that shows hairline cracks or warping.
- Avoid full-speed flight near hard surfaces and obstacles.
- Land early when the drone starts vibrating or drifting unusually.
- Keep spare propellers and, if possible, a replacement motor on hand.
Post-crash motor failure on the HS175 is usually traceable to visible physical damage or a small electrical fault.
Careful inspection, simple component testing, and timely part replacement will solve most cases without guesswork.