Safety first: Remove the battery and wait for all LEDs to go off before disassembly. Do not touch internal capacitors on the PCB.

Check for blockages first: Ensure filters, cyclone, wand, and floor head are clear. A severe blockage can mimic a motor fault.
Listen to the motor: With all accessories removed, briefly power on. A grinding, squealing, or no-spin condition with E4 strongly indicates motor failure.
Inspect for burning smell: If you smell burnt plastic or electrical odor, stop using the vacuum immediately.
Disassemble body: Remove screws on the main body housing as per service guide. Separate the shell to access the Main Motor Assembly.
Check fan area: Inspect the motor fan for debris or broken blades. Remove any foreign objects.
Replace motor module: If the motor shaft is stiff or has play, replace the entire Main Motor Assembly (motor + fan module) rather than attempting to repair the motor.
Reassemble and test: Refit all seals and gaskets to prevent air leaks. Test on low power first.

Vacuum shows E4; motor does not start or starts then stops with a high-pitched whine.

Possible Causes