Vax Airflow Regulation / Electronic Control Instability

Cordless Vax vacuum’s motor pulses up and down in speed repeatedly without user input.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Partial blockage in airflow path, Clogged filters causing fluctuating load, Faulty motor control PCB, Intermittent battery connection

Safety first: Remove the battery before clearing blockages or accessing filters.

1. Clear all blockages: Thoroughly check and clear the bin, cyclone, wand, and floorhead.
2. Clean filters: Wash or replace the pre-motor and post-motor filters as recommended.
3. Check battery fit: Ensure the battery is fully latched and contacts are clean.

If pulsing continues with clear airflow and a known-good battery, the motor control PCB may be faulty and the main body assembly should be serviced.

Medium 3/5

Main Control PCB

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