H1
Bosch High Temperature Protection / Sensor Over-Range

Display shows H1 and cooker stops or refuses to start high-heat programs.

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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

Blocked ventilation, Excessive ambient temperature, Faulty NTC sensor reading too high, Control board misreading sensor

How to Fix / Troubleshooting

Safety first: Allow the cooker to cool and unplug it.

  • Improve ventilation: Move the cooker to an open area away from walls and cabinets. Ensure vents are not blocked.
  • Clean base and vents: Remove dust and grease from ventilation slots and the base using a soft brush or vacuum.
  • Avoid repeated high-heat cycles: Allow a few minutes of cooling between back-to-back frying or sauté cycles.
  • Advanced diagnosis: If H1 appears even when the cooker is cold, the NTC sensor or control board is likely faulty and should be tested and replaced as needed.
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Repair Difficulty

Medium 3/5

Required Part

NTC Temperature Sensor
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