Bosch Intermittent Power Loss / Thermal Cutback

Bosch EV charger intermittently stops charging mid-session without any error code; LEDs may briefly flash.

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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 line terminals inside charger, Overheating contactor, Marginal breaker or wiring, Overtemperature sensor triggering without display code

How to Fix / Troubleshooting

Safety first: Turn OFF the breaker before any physical inspection. Intermittent connections can arc and overheat.

  • Check for pattern: Note if charging stops after a consistent time or when ambient temperature is high. This suggests thermal issues.
  • Feel for heat: After a charging session, carefully feel the front of the charger and the breaker (without opening anything). Excessive warmth at the breaker or charger may indicate loose connections.
  • Electrician inspection: Have a licensed electrician open the wiring compartment, tighten all line and ground terminals to Bosch-specified torque, and inspect for discoloration or melted insulation.
  • Service internal components: If wiring is sound, a technician should inspect the internal contactor and temperature sensors and replace any overheated parts.
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Repair Difficulty

Hard 4/5

Required Part

Main Power Contactor / Line Terminal Block
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