One drone motor won't spin

Symptoms

• One propeller doesn't spin while others do
• Uneven vibration or drone tips to one side attempting takeoff
• Clicking or grinding sound from one motor
• Motor spins briefly then stops

Likely causes

• CommonDebris or grass wrapped around that motor or propellerForeign material can physically block a single motor.
• CommonLoose or damaged wiring connection to that motorVibration over time or a crash can loosen a connector.
• PossibleFailed electronic speed controller (ESC) for that motorEach motor typically has its own ESC that can fail independently.
• PossibleBent motor shaft from a hard landing or crashPhysical damage can prevent the motor from spinning freely.
• Less commonMotor bearing failure from wear or water exposureInternal bearing damage stops smooth rotation.

What to do

1. Power off and remove the battery before inspecting any motor by hand.
2. Check the affected propeller and motor for wrapped grass, hair, or debris and clear it gently.
3. Spin the motor shaft gently by hand (power off) to feel for grinding or resistance.
4. Inspect the wiring connection from that motor to the flight controller for looseness or damage.
5. Swap that motor's propeller with a known-good one to rule out a bent or damaged propeller.
6. If possible, test by briefly swapping ESCs between a working and non-working motor to isolate the fault.
7. If the motor still won't spin after clearing debris and checking connections, it likely needs replacement by a drone repair technician.

Tools and parts

• Small screwdriver

When to call a pro

If clearing debris and checking wiring doesn't get the motor spinning, a drone repair specialist can replace the motor or ESC.

Safety