What it means when a Holy Stone HS720 propeller is not spinning
If your Holy Stone HS720 propeller not spinning issue appears during startup, takeoff, or mid-flight, it usually points to a motor, propeller, ESC, battery, or calibration problem.
The HS720 is a GPS drone with brushless motors, so a single non-spinning propeller often has a specific mechanical or electrical cause worth checking first.
This guide explains the most common reasons an HS720 propeller stops spinning, how to inspect each part safely, and which repairs or resets are worth trying before you replace hardware.
Common causes of an HS720 propeller not spinning
Several parts can stop one arm or one propeller from spinning normally.
In many cases, the drone is protecting itself after detecting a fault, while in others the issue is simple damage or debris.
- Damaged propeller: A bent, cracked, or incorrectly installed blade can prevent normal rotation.
- Motor obstruction: Dirt, sand, hair, or grass can jam the brushless motor shaft.
- Loose motor wire: A disconnected or partially damaged wire can interrupt power to one motor.
- ESC fault: The electronic speed controller may fail to send the right signal to the motor.
- Low battery voltage: Weak batteries can cause startup failures or uneven motor response.
- Calibration issue: Compass, gyro, or IMU errors can stop the drone from arming correctly.
- Controller or app pairing problem: If the drone does not arm fully, the motors may not start as expected.
First checks to perform before any repair
Start with the simplest checks.
These take only a few minutes and often reveal the problem immediately.
Inspect the propeller by hand
Power off the drone, remove the battery, and gently rotate each propeller.
They should move freely without scraping, binding, or wobbling.
Compare the non-spinning side with the others and look for chips, cracks, or a hub that does not sit flush on the motor shaft.
Check whether the motor spins freely
With the propeller removed, gently rotate the motor bell by hand.
A healthy motor should turn smoothly with light magnetic resistance.
If it feels gritty, stuck, or uneven, debris or internal damage may be the cause.
Confirm the propeller orientation
The HS720 uses clockwise and counterclockwise propellers that must be installed on the correct arms.
A mismatched propeller may fit physically but will not generate proper lift, and the drone may fail to arm or tip during takeoff.
How to diagnose the Holy Stone HS720 propeller not spinning issue
Once the basics are clear, narrow the fault by testing the motor, battery, and control system one step at a time.
Test with a fully charged battery
Low voltage is a common reason one or more motors fail to start consistently.
Charge the battery fully using the official charger, then try a fresh launch.
If the issue appears only near the end of a flight, the battery may be aging or no longer holding voltage well.
Swap propellers between arms
If you suspect a propeller defect, move the non-spinning arm’s propeller to a different motor and see whether the problem follows the propeller.
If the issue moves with the blade, the propeller is the culprit.
If it stays on the same arm, the motor, wire, or ESC is more likely at fault.
Listen for startup sounds
When you arm the HS720, listen for differences between motors.
A bad motor may click, twitch, hum briefly, or remain silent while the others spin.
That pattern can help identify whether the failure is mechanical or electronic.
Check for error behavior during arming
If the drone refuses to start, blinks unexpectedly, or shows app warnings, the problem may not be the propeller itself.
Instead, the flight controller may be preventing motor activation because of compass error, gyroscope drift, or pairing problems.
Fixes that often restore normal spinning
After identifying the likely cause, use the appropriate fix.
Always keep the battery disconnected until you are ready to test the drone.
Clean the motor and arm area
Use compressed air, a soft brush, or a wooden toothpick to remove dust and debris around the motor shaft and arm opening.
Avoid oils and heavy lubricants, because brushless drone motors are not designed to be greased like mechanical gears.
Reinstall or replace the propeller
If the propeller is damaged or mounted incorrectly, replace it with the correct HS720 propeller type.
Ensure the blade is firmly seated and matches the arm direction.
Even slight misalignment can cause the drone to wobble or refuse takeoff.
Reset calibration
Perform the HS720 calibration steps recommended by Holy Stone before flight.
A fresh gyro or compass calibration can clear a startup issue that looks like a motor failure.
Do this on a flat, open surface away from metal objects, vehicles, and power lines.
Reseat all visible connections
If you are comfortable opening the drone body, inspect for loose plugs or damaged motor leads.
A partially disconnected wire can create intermittent spinning or complete failure on one arm.
If a wire is frayed or pulled free, it may require soldering or replacement.
Replace a faulty motor
If the motor is seized, noisy, or fails every test, replacement is often the fastest solution.
Brushless motors are wear items in hard-used drones, especially after crashes, water exposure, or sand ingestion.
Use the exact HS720-compatible motor specification to avoid fit or performance issues.
When the problem is not the propeller
Sometimes a user reports a Holy Stone HS720 propeller not spinning when the real problem is elsewhere in the flight system.
Identifying the wrong component can waste time and money, so check these related areas.
- Remote control binding: The transmitter may not be paired correctly with the drone.
- IMU drift: The drone may sense instability and refuse normal motor startup.
- Crash damage: A hard landing can bend a motor shaft or crack the arm housing.
- Water exposure: Moisture can short the ESC or corrode motor contacts.
- Firmware or app issues: If the app controls arming behavior, outdated software can affect launch.
How to prevent propeller and motor failures on the HS720
Preventive maintenance reduces the chance of future spinning problems and improves flight reliability.
- Inspect propellers before every flight for cracks, looseness, and warping.
- Keep the motors free of sand, grass, and dust after outdoor use.
- Use only the correct battery and keep it charged according to the manufacturer’s guidance.
- Avoid hard landings, especially on gravel, pavement, or uneven terrain.
- Store the drone in a dry case to limit corrosion and moisture damage.
- Replace worn propellers as soon as you see damage, even if the drone still flies.
When to stop troubleshooting and seek support
If the same arm still does not spin after propeller replacement, cleaning, calibration, and battery testing, the issue is likely hardware-related.
At that point, the most practical next step is contacting Holy Stone support, a drone repair shop, or the seller if the drone is under warranty.
Document what you tested, which motor failed, and whether the problem is constant or intermittent.
That information helps support teams identify whether the fix should be a motor replacement, flight controller repair, or full unit exchange.
Quick diagnostic checklist for the Holy Stone HS720 propeller not spinning issue
- Remove the battery and inspect the propeller for damage.
- Confirm correct propeller orientation and fit.
- Spin the motor by hand to check for binding.
- Charge the battery fully and retest.
- Recalibrate the drone on a flat surface.
- Swap propellers to see whether the fault follows the blade.
- Inspect visible wires and connectors for looseness or damage.
- Replace the motor if the same arm still fails after all basic checks.