F4
Jimmy
Battery Communication / Fuel Gauge Fault
F4 code, vacuum runs but battery indicator behaves erratically (jumps from full to empty)
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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
Loose battery connector, Faulty battery fuel gauge IC inside pack, Damaged communication line between battery and PCB, Non-original or incompatible battery pack
How to Fix / Troubleshooting
Safety first: Remove the battery before inspecting connectors.
- Step 1 – Confirm genuine battery: Ensure you are using an original Jimmy battery pack designed for your model. Third-party packs may not communicate correctly.
- Step 2 – Inspect contacts: Check the multi-pin connector between the battery and the vacuum body. Clean gently with a dry cloth and ensure firm engagement.
- Step 3 – Reset battery: Remove the battery for 5 minutes, then reinstall and fully charge. Observe if the indicator behaves more normally.
- Step 4 – Test with another battery: If possible, try a known-good Jimmy battery. If the indicator works correctly, replace the original battery pack.
- Step 5 – PCB replacement: If multiple batteries show the same F4 behavior, the main control PCB may have a faulty gauge circuit and should be replaced.
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Repair Difficulty
Medium
3/5
Required Part
Jimmy Lithium Battery Pack
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