E8
Tristar
Power Mode Control / Current Limit Fault
Vacuum runs only at low power; cannot switch to high/turbo mode; E8 or eight red flashes appear when trying to change power 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
Defective power mode switch or trigger, Faulty main control PCB current sensing circuit, Partially shorted main motor drawing excessive current at high speed
How to Fix / Troubleshooting
Safety first: Remove the battery pack before inspecting switches or wiring.
- Check the power mode switch: Operate the mode button or slider repeatedly with the unit off to free any sticking contacts. Inspect for physical damage or contamination around the switch.
- Clean around controls: Use a dry brush or compressed air to remove dust from around the trigger and mode switch. Do not spray liquids directly into the controls.
- Test in different configurations: Remove the wand and nozzle and run the vacuum as a handheld unit. If high mode works without the floor head attached, the nozzle may be overloading the system.
- Persistent limitation: If high mode never engages, the main control PCB or motor may be faulty. Replacement of the control board or motor assembly is recommended and typically requires disassembly of the main body.
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Repair Difficulty
Hard
4/5
Required Part
Tristar Main Control PCB
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