C1
Klarstein Temperature Sensor Calibration Error

C1 or calibration error appears; cooker may not regulate temperature correctly.

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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

Replacement sensor not matched to original spec, Firmware lost calibration data, Main PCB EEPROM fault

How to Fix / Troubleshooting

Safety: Unplug the cooker before any internal work.

Step 1 – Confirm correct parts:

  • If a sensor was recently replaced, verify it is the correct Klarstein part number for your model.

Step 2 – Reset attempt:

  • Perform a full power reset (unplug 20 minutes) and test again.

Step 3 – Service calibration:

  • Many calibration procedures require service software or hidden key combinations not documented for end users.
  • Contact Klarstein support or an authorized service center to recalibrate or replace the main control PCB.
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Repair Difficulty

Professional Required 5/5

Required Part

Main Control PCB
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