Rational iCombi Pro - Error 120: Level Electrode Without Signal While Carechemie Is In The Steam Generator

🛑 Critical / Stop Operation
Warning: The information provided here is for educational purposes only. Working with commercial kitchen equipment involves high voltage, gas, and high temperatures. We strongly recommend contacting a certified service technician for any repairs. We are not responsible for any damage or injuries resulting from DIY repair attempts. This information is provided 'as is' without any guarantees of completeness or accuracy.

TLDR

On your iCombi Pro unit, error code 120 indicates that the level electrode within the steam generator is not providing a signal, particularly when Carechemie is present. This issue prevents accurate water level control, making steam generation unsafe or impossible, and will halt oven operation. Immediately cease use, power cycle the unit, and if the error persists, inspect the electrode and its connections for faults or scale buildup.

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Technical Details

Repair Steps:

  1. Safety First: Before any inspection or repair, always disconnect the RATIONAL iCombi Pro unit from its main power supply. Allow the steam generator to cool down completely to prevent burns.
  2. Power Cycle and Reset: Reconnect the unit after a few minutes to perform a hard reset. If the error code reappears immediately, proceed to further inspection.
  3. Access the Steam Generator: Carefully remove the necessary panels to gain access to the steam generator. Consult your iCombi Pro service manual for specific panel removal instructions.
  4. Inspect the Level Electrode: Locate the level electrode, which is typically a probe extending into the steam generator. Visually inspect it for any signs of damage, corrosion, or heavy scale buildup, especially noting the specific context of “Carechemie”. Carechemie residues can sometimes interfere with electrode conductivity if not properly rinsed.
  5. Clean the Level Electrode: If scale or residue is present, carefully clean the electrode using a non-abrasive brush or descaling solution. Ensure all Carechemie residues are thoroughly flushed out with clean water if they are suspected of causing interference.
  6. Check Wiring and Connections: Trace the wiring from the level electrode back to the control board. Look for any loose connections, crimped wires, or signs of heat damage. Ensure all connectors are securely seated.
  7. Test Continuity (Advanced): If you have a multimeter, you can test the continuity of the electrode wiring and potentially the electrode itself (refer to Rational’s technical documentation for specific resistance values if available).
  8. Inspect Water Quality and Supply: Ensure the unit has an adequate and consistent water supply, and that any external water filters or softeners are functioning correctly, as poor water quality can lead to rapid scaling of electrodes.
  9. Replace the Level Electrode: If the electrode is physically damaged, heavily scaled beyond cleaning, or if testing confirms an internal fault, it will need to be replaced with a genuine RATIONAL iCombi Pro Level Electrode part.
  10. Professional Assistance: If after performing these steps the error code 120 persists, it may indicate a fault with the main control board or a more complex issue. Contact a certified RATIONAL service technician for diagnosis and repair.

Common Questions:

Q: Why is error code 120 considered a high severity issue on my iCombi Pro?

A: This error is critical because the level electrode is essential for monitoring and controlling the water level in the steam generator. Without an accurate signal, the unit cannot safely or effectively produce steam, potentially leading to overheating, damage to heating elements, or complete operational shutdown of steam-based cooking functions.

Q: Can I clear the 120 error code myself or do I need a technician?

A: You can perform initial troubleshooting steps yourself, such as a power cycle and inspecting/cleaning the level electrode for scale or Carechemie residues, and checking its wiring. However, if the error persists after these checks, or if you’re uncomfortable working with electrical components, it is strongly recommended to contact a certified RATIONAL service technician.

Q: What are the common causes for a level electrode to fail or lose signal in an iCombi Pro?

A: Common causes include significant scale buildup on the electrode, which insulates it and prevents accurate readings; physical damage to the electrode or its ceramic insulator; corrosion of the electrical connections; or, as indicated by the error description, residual Carechemie interfering with conductivity. Less commonly, a faulty control board could also be the cause.

When to call a technician

For this error, we recommend calling a certified technician. Do not continue operation or attempt repair yourself.

  • Equipment shows a critical or stop-operation fault.
  • You smell gas, burning, or see smoke or sparks.
  • Error returns after following the steps above.
  • You are not trained to work on this equipment.
  • Warranty or safety could be affected by DIY repair.

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Other iCombi Pro Error Codes

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