E28
Polestar
Low-Voltage Auxiliary Power Supply Fault
Charger shows E28; display may indicate ‘Internal Power Supply Error’; LEDs may be dim or flicker.
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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
Failed internal SMPS (switch‑mode power supply), Short on low‑voltage rail, Loose connector between SMPS and control board, Surge damage
How to Fix / Troubleshooting
Safety first: Turn off power and wait for capacitors to discharge before touching internal boards.
- Visual inspection: Look for bulging capacitors, burn marks, or a burnt smell near the low‑voltage power supply section.
- Check connectors: Ensure the low‑voltage harness from the SMPS to the main control board is firmly seated.
- Minimal testing: If you have the skills and tools, measure the low‑voltage outputs (e.g., 5 V, 12 V) with the unit powered, following all safety precautions.
- Replace module/board: If the auxiliary supply is unstable or missing, replace the Polestar power supply module or the entire main control board assembly.
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Repair Difficulty
Professional Required
5/5
Required Part
Polestar Low-Voltage Power Supply Module
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