CP_a020
Tesla
Brownout / Power Quality Event Detected
Wall Connector LEDs show error; app logs CP_a020; charger appears unresponsive after power events
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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
Frequent utility brownouts, Undersized service conductors, Loose main service connections, Voltage dips when large loads start
How to Fix / Troubleshooting
Safety: Repeated brownouts can damage appliances. Have an electrician evaluate your service if this is frequent.
- Observe timing: Note if CP_a020 occurs when large loads (AC compressor, well pump) start. Avoid starting these loads while initiating charging if possible.
- Check panel loading: Ensure the total load on the service does not exceed its rating, especially during peak times.
- Utility check: Contact your utility to report voltage fluctuations; they may test and correct supply issues.
- Surge/brownout protection: Consider installing whole‑home surge and voltage regulation equipment if brownouts are common.
- If only the Wall Connector is affected: Internal power quality sensing may be overly sensitive or faulty; replacement may be needed.
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Repair Difficulty
Medium
3/5
Required Part
Service entrance conductors and Tesla Wall Connector power quality sensing circuit
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