A floor scrubber charger "not charging" usually indicates a combination of six faults. Follow the three steps of "look → test → replace" to quickly pinpoint the problem:

I. Overview of the Six Faults

| Fault | Symptom | Quick Diagnosis |

| 1. No mains power | Indicator light off | Change socket → Light on → OK

| 2. Blown fuse | Indicator light off, multimeter no 300V | Multimeter input → No power → Replace fuse

| 3. Broken output wire | Light on but no output | Multimeter output → 0V → Replace wire

| 4. Reverse battery connection/short circuit | Light flashing or 0V | Replace with same model battery → Normal → Battery faulty

| 5. Bulging capacitor | Light on but low output | Multimeter ESR > 0.1Ω → Replace capacitor

| 6. MOSFET short circuit | Light on but short circuit | Multimeter diode mode → Short circuit → Replace MOSFET |

Two or Three-Step Troubleshooting Method

1. Check

- Indicator Light: Not lit → Skip to step 2; Light but flashing → Steps 4/5/6;

- Appearance: Bulging, burning, broken wire → Replace directly.

2. Test

- Use a multimeter to test the input → No power → Replace the fuse;

- Test the output → 0V → Replace the wire or battery;

- Test the capacitor ESR → >0.1Ω → Replace the capacitor.

3. Replace

- Replace the fuse → output wire → battery → capacitor → MOSFET. Repeat the test after each replacement until it is normal.

III. Prevention Tips

“Check the indicator light → Test the voltage → Replace the component”

“Fuse → Output wire → Battery → Capacitor → MOSFET” Replace in order, and you can fix 90% of faults without disassembling the machine!

Follow the above steps, locate the problem in 10 minutes, repair it in 30 minutes, and bring your floor scrubber charger back to full power!