Bosch
Electrical Overload / Short Circuit
Bosch water heater trips the circuit breaker when it starts
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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
Shorted heating element (electric models), Shorted combustion fan or pump motor, Incorrect breaker size or wiring, Internal control board short
How to Fix / Troubleshooting
Safety first: Do not repeatedly reset a breaker that trips immediately. Turn OFF the breaker and leave it off until the fault is found.
- Verify breaker size: Confirm that the breaker and wiring gauge match Bosch installation requirements for your model.
- Inspect for visible damage: With power off, remove the cover and look for burned components, melted insulation, or signs of arcing.
- Isolate components (pro level): A technician can disconnect loads (elements, fan, pump) one at a time to identify the shorted component.
- Replace faulty part: Replace any shorted heating element, motor, or control board as identified by testing.
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Repair Difficulty
Professional Required
5/5
Required Part
Heating Element Assembly
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