Vacuum shows E12 and will not charge fully, stops charging at a low percentage

Safety first: Use only the original Candy charger. Do not attempt to open the battery pack.

• 1. Full charge cycle: Connect the vacuum to the charger and leave it for the full recommended time (often 3–5 hours), even if the LEDs appear to stop increasing. Some BMS systems perform balancing at the end of charge.
• 2. Check charger output: Verify the charger voltage with a multimeter if you are competent. Replace the charger if the output is significantly below the rated value.
• 3. Runtime test: After charging, run the vacuum continuously on a fixed power level and time how long it operates. Compare to the specification. If runtime is much shorter, the battery capacity has degraded.
• 4. Replace battery pack: Persistent E12 and short runtime indicate the battery pack needs replacement. Purchase a genuine Candy replacement pack with the same voltage and capacity rating.
• 5. Main PCB check: If a new battery shows the same behavior, the charging circuit on the main PCB may be faulty and requires professional service.