E105
Bosch
Input Overvoltage / Undervoltage Protection
Bosch EV charger shows E105 and refuses to charge; may occur after a power outage or surge.
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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
Supply voltage outside 208–240 V range, Loose neutral or hot connection in panel, Utility brownout or surge, Faulty input voltage sensing circuit on main PCB
How to Fix / Troubleshooting
Safety first: Do not attempt to measure live voltage unless you are a qualified electrician with proper tools.
- Check other 240 V appliances: If other 240 V loads (dryer, range) are behaving abnormally, there may be a supply issue. Contact your utility or electrician.
- Power-cycle after outage: Turn the charger’s breaker OFF for 2 minutes, then ON. Temporary voltage anomalies can latch an error.
- Have voltage checked: Ask a licensed electrician to measure the line-to-line voltage at the charger disconnect or breaker. It should be within the Bosch-specified range (typically 208–240 VAC). Correct any panel or wiring issues.
- Surge protection: If E105 appeared after a storm or surge, consider installing a whole-home surge protector and have the charger’s internal MOV/surge components inspected.
- Board replacement: If supply voltage is normal but E105 persists, the input voltage sensing circuit on the main control board may be damaged and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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