Black+Decker Mode Control Stuck / Low-Speed Circuit Fault

Vacuum runs only on high power and will not switch to eco/low mode

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

Stuck mode button, Faulty low-speed control on PCB, Shorted speed selector contacts, Firmware glitch

Safety first: Remove the battery before working near controls.

Operate mode button: Press the mode button repeatedly with the battery removed to free any sticking.
Clean around button: Use a dry brush to remove dust from the button edges.
Reset unit: With the battery removed, hold the power button (if present) for 10–15 seconds, then reinstall the battery and test.
Service electronics: If the vacuum remains stuck in high mode, the main PCB's speed control circuit may need replacement.

Medium 3/5

Main Control PCB / Mode Button

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