What a Holy Stone HS720 motor not spinning problem usually means
If your Holy Stone HS720 motor not spinning issue appears after takeoff, startup, or a crash, the drone is usually blocking motor startup for a specific reason.
The cause is often simple, but because the HS720 uses a flight controller, electronic speed control logic, and safety checks, one failed link can stop a single motor or all motors from starting.
In most cases, the problem falls into one of five categories: battery power, propeller or arm obstruction, motor calibration and binding, ESC or flight controller fault, or physical motor damage.
The fastest fix depends on whether one motor is dead, two motors are failing, or the entire aircraft refuses to arm.
Check whether the problem affects one motor or all motors
Start by identifying the pattern.
That distinction narrows the diagnosis immediately.
- One motor not spinning: often indicates a damaged motor, broken wire, bent shaft, or ESC channel failure.
- Two motors not spinning: may point to a connector issue, flight controller error, or crash-related internal damage.
- All motors not spinning: usually means a battery, arm/disarm, calibration, or safety-interlock issue.
Power on the drone without props installed and observe whether the motors twitch, emit beeps, or remain completely silent.
A motor that twitches but will not turn is usually receiving some signal, which makes the problem different from a dead motor with no response at all.
Inspect the battery and power delivery first
The Holy Stone HS720 is sensitive to voltage drop.
A battery can appear charged while still failing under load, especially if it is old, swollen, cold, or not seated correctly.
- Charge the battery fully with the original charger or a compatible replacement.
- Confirm the battery clicks firmly into the drone.
- Inspect the battery contacts for dirt, oxidation, or bending.
- Try a second known-good battery if available.
- Check for swelling, cracks, or unusual heat during charging.
If the drone powers on but shuts down or refuses to spin motors after a few seconds, the battery may be sagging under startup load.
Lithium polymer battery performance degrades over time, and a weak pack can cause motor startup failure even when the lights and app still work.
Remove propellers and check for physical obstruction
Before deeper troubleshooting, make sure the propellers are off.
A bent prop, debris, or a damaged motor mount can prevent a motor from turning freely.
Spin each motor gently by hand.
It should rotate smoothly with slight magnetic resistance.
If one motor feels gritty, locked, or much tighter than the others, the problem is mechanical rather than electronic.
- Look for hair, sand, grass, or thread around the motor shaft.
- Check whether a propeller hub is rubbing the arm or motor housing.
- Inspect the drone after any landing on dirt, pavement, or wet ground.
- Verify that the correct propeller is on the correct motor, if replacements were installed.
A propeller mounted incorrectly can create enough resistance to prevent startup or make the flight controller shut the motor down for safety.
Recalibrate the drone before assuming a hardware failure
Many drone startup faults trace back to an unstable IMU or compass reading.
If the HS720 believes it is tilted, drifting, or unsafe to arm, it may limit motor behavior.
- Place the drone on a flat, level surface.
- Complete the manufacturer-recommended gyro or IMU calibration.
- Rebind the controller if the aircraft appears unresponsive.
- Wait for all status lights to show normal readiness before throttling up.
If the issue began after a firmware update, hard landing, or transportation in a bag, calibration is especially important.
Gyroscope and accelerometer drift can confuse the flight controller and block motor startup.
Look for binding, arming, and safety-interlock problems
The HS720 will not always spin motors simply because the throttle stick moves.
It needs to be armed, connected, and in a state that the controller considers safe.
Common reasons the drone stays disarmed include:
- Controller and drone are not properly linked.
- The throttle trim or stick position is not centered as expected.
- The drone is on an uneven surface at startup.
- Low battery protection has triggered.
- The app or remote is not completing the normal launch sequence.
Check the startup sequence carefully.
Turn on the controller first if the manual recommends it, then the drone, then confirm linking, then arm the motors.
If the LED pattern is unusual, compare it to the user manual to identify warning codes.
Test whether the motor is receiving a signal
If one HS720 motor still will not spin after battery and calibration checks, determine whether it is receiving control output from the flight system.
This helps separate a motor problem from a control-board problem.
Listen for differences when you raise throttle briefly with props removed.
A healthy motor usually responds with a clean start and changes speed smoothly.
A failed ESC channel or broken wire may produce no motion, a short pulse, or intermittent spinning.
Signs of a signal-side issue include:
- Motor twitches once but does not continue rotating.
- The same arm fails every time.
- The motor behaves differently after a restart but then fails again.
- The drone reports normal connection, but throttle response is inconsistent.
If the motor never responds while the others spin normally, the issue is likely isolated to that arm’s wiring, motor, or ESC output.
Check for crash damage inside the arm
Crash landings are one of the most common reasons a Holy Stone HS720 motor stops spinning.
Even a modest impact can loosen a connector, crack a solder joint, or damage a winding inside the brushless motor.
Carefully inspect the arm and motor housing for these symptoms:
- Visible cracks in the plastic arm or motor mount
- Loose motor wires near the hinge or body
- Burn marks or a smell of overheating electronics
- One propeller arm that feels warmer than the others after a brief power test
Do not continue repeated throttle tests if the motor is buzzing, binding, or heating quickly.
A failing motor or ESC can worsen rapidly and may damage the flight controller.
When the ESC or flight controller is likely the cause
The electronic speed controller, often integrated into the drone’s control electronics, converts flight commands into motor power.
If it fails, one motor may stop responding even though the rest of the aircraft seems normal.
Consider ESC or flight controller problems if:
- The same motor fails after battery swaps and calibration.
- The motor is mechanically free but receives no consistent startup response.
- The drone worked normally before a sudden shutdown or impact.
- The problem persists across multiple sessions and locations.
ESC failures are harder to diagnose at home because the fault can mimic a bad motor.
A technician or replacement part may be necessary if the drone is outside return coverage.
How to tell if the motor itself has failed
Brushless drone motors can fail from bearing wear, winding damage, contamination, or impact.
If the motor has power and control input but still will not spin, the motor itself may need replacement.
Typical motor-failure clues include:
- Grinding, scraping, or rough rotation by hand
- Intermittent startup that gets worse over time
- Noticeable side-to-side shaft wobble
- One arm lagging even when the others respond normally
If you replace a motor, match the part number and connector style exactly.
Using an incompatible motor can create balance problems, poor thrust, or another startup failure.
Practical repair steps and prevention tips
For a Holy Stone HS720 motor not spinning issue, the most efficient repair sequence is simple: verify battery health, remove props, clear obstructions, recalibrate, rebind, then isolate whether the fault follows one arm or one motor.
That process prevents unnecessary part replacements.
- Store batteries at proper charge levels and avoid deep discharge.
- Inspect motors after every hard landing.
- Keep sand, grass, and moisture away from the arms and motor vents.
- Replace damaged props immediately.
- Update firmware only when the drone is stable and fully charged.
If the motor still refuses to spin after these checks, the safest next step is part replacement or professional service.
Continued testing can turn a single failed component into a larger repair.