CP-B3
ChargePoint
Internal CAN / Serial Bus Communication Failure
The charger reports an internal communication error between the logic board and the power board; charging is disabled.
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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
Loose ribbon cable between boards, an oxidized board-to-board connector, a faulty power board microcontroller, or a faulty main logic board.
How to Fix / Troubleshooting
Safety: Internal servicing should be done only by qualified personnel with power disconnected.
- Step 1 – De-energize:
- Turn off the breaker and verify power is off.
- Step 2 – Inspect internal connectors:
- Open the housing and locate the main control board and any separate power board.
- Check ribbon cables and multi-pin connectors for secure seating.
- Disconnect and reconnect connectors to wipe contacts.
- Step 3 – Visual inspection:
- Look for corrosion, bent pins, or physical damage on connectors.
- Step 4 – Power up and test:
- Reassemble, restore power, and see if the error clears.
- Step 5 – Board replacement:
- If the fault persists, either the main control board or the power board is defective.
- Follow ChargePoint diagnostics to determine which board to replace.
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Repair Difficulty
Hard
4/5
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