Chevrolet
Supply Voltage Sag / Electrical Interference
Charger display or LEDs flicker or reset when large appliances in the home turn on.
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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
Shared feeder with large loads (HVAC, ovens), Loose neutral or line connection in panel, Undersized service for combined loads, Sensitive charger power supply
How to Fix / Troubleshooting
Safety first: Panel work should be done by a licensed electrician.
- Step 1 – Observe pattern: Note which appliances cause the flicker or reset when they start.
- Step 2 – Check connections: Have an electrician inspect and tighten all main lugs, neutrals, and the charger breaker connections.
- Step 3 – Load balancing: Avoid running multiple high-power appliances while fast charging, or reduce the charger’s maximum current.
- Step 4 – Service upgrade: If the home’s main service is undersized for combined loads, consider upgrading the service capacity.
- Step 5 – Surge/line conditioner: In some cases, adding whole-home surge protection and ensuring proper grounding can improve stability.
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Repair Difficulty
Medium
3/5
Required Part
Main Electrical Service and Branch Circuit
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