Shark
High-Power Mode Control Failure
Cordless Shark vacuum's MAX/Boost mode does not engage; suction remains at normal level
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Safety Warning
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.
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Possible Causes
Faulty MAX/Boost button or slider, Software/firmware glitch in control PCB, Overheated battery preventing high‑power mode, Damaged wiring to mode switch
How to Fix / Troubleshooting
Safety first: Remove the battery before inspecting controls.
- 1. Allow cooling time: If the vacuum has been used heavily, let it cool for 30 minutes and try MAX/Boost again. Some models limit high‑power mode when hot.
- 2. Operate switch repeatedly: Press or slide the MAX/Boost control many times to clear internal oxidation.
- 3. Test with fully charged battery: Low battery charge can disable high‑power mode. Charge fully and retest.
- 4. Inspect switch area: Check for physical damage or debris around the control. Clean with a dry cloth.
- 5. Replace handle/control PCB: If MAX/Boost still does not engage, the switch or control PCB may be faulty and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Handle Control PCB / Mode Switch
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