Rational iCombi Pro - Error 35.x: UltraVent System Fault

🛑 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 35.x indicates a fault within the UltraVent condensation hood system, ranging from electrical issues like missing voltage or motor protection defects, to sensor malfunctions for filter detection, or simply a dirty/missing filter. This requires a thorough inspection of the UltraVent's electrical supply, filter, fan motor, and sensor components. Addressing these issues promptly is vital for proper operation and kitchen air quality.

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Technical Details

Repair Steps:

  1. Verify UltraVent Power Supply:
    Access the UltraVent’s electrical compartment (ensure main power to the iCombi Pro is disconnected). Check incoming voltage to the UltraVent control board using a multimeter. Look for any loose connections, burnt wiring, or blown fuses on the UltraVent’s internal PCB. If voltage is missing, trace back to the main iCombi Pro connection or facility power source. Replace any defective components such as fuses or damaged wiring.
  2. Inspect UltraVent Filter and Detection:
    Remove and thoroughly inspect the UltraVent filter cassette. Ensure it is clean, free from heavy grease build-up, and correctly inserted. Often, accumulated dirt (35.5/35.6) or improper insertion (35.7) can cause differential pressure sensor errors or faulty filter detection (35.2). Clean or replace the filter as necessary. Verify the filter detection switch (if applicable) or sensor for proper function and connection.
  3. Check UltraVent Fan Motor and Protection:
    With the power disconnected, physically inspect the UltraVent fan motor for any obstructions, signs of overheating, or damage. Check the motor windings for continuity and insulation. The error code 35.4 refers to a defective thermocouple for motor protection, meaning the motor’s internal thermal protection sensor is faulty or the motor itself is overheating. Test the motor’s thermocouple; if it’s open or shorted, the motor assembly likely needs replacement.
  4. Examine UltraVent Thermocouple and Differential Pressure Sensor:
    Error 35.3 indicates a thermocouple control fault within the UltraVent. Locate and inspect the UltraVent’s exhaust thermocouple. Test its resistance values to ensure they are within specifications. For error 35.7 (no differential pressure measured), inspect the differential pressure sensor and its associated tubing. Ensure the tubing is clear, not kinked, and properly connected to the fan housing. A faulty sensor or blocked tubing will prevent accurate airflow measurement.
  5. Inspect Wiring and Control Board:
    Carefully check all wiring harnesses connecting the UltraVent components (motor, sensors, filter detection) to the UltraVent control board, and from the UltraVent to the iCombi Pro’s main control board. Look for continuity, signs of fraying, rodent damage, or loose connectors. If all components test good, the UltraVent control board itself might be faulty and require replacement.
  6. Perform System Reset and Test:
    After addressing any identified issues, reassemble the UltraVent and restore power to the iCombi Pro. Access the service menu (if available) to reset the error code. Initiate a cooking cycle or the UltraVent’s test function (if available in service mode) to confirm proper operation and ensure the error does not reappear.

Common Questions:

Q: What is the primary function of the RATIONAL iCombi Pro UltraVent?

A: The RATIONAL iCombi Pro UltraVent is a condensation hood designed to effectively bind and discharge steam generated during the cooking process. It minimizes moisture and grease in the kitchen environment, eliminating the need for complex, external ventilation systems and ensuring a more comfortable and safer workspace.

Q: How often should I check or replace the UltraVent filter?

A: The frequency of checking or replacing the UltraVent filter depends on your unit’s usage and the type of food being cooked. Error codes 35.5 and 35.6 provide advance warning and immediate replacement prompts. Generally, it’s recommended to visually inspect the filter regularly and replace it as soon as a warning appears or signs of heavy dirt/grease accumulation are evident.

Q: Can I operate my iCombi Pro if the UltraVent has an error 35.x?

A: While the iCombi Pro might technically still function in some capacity with an UltraVent error 35.x, it is strongly not recommended. The UltraVent is crucial for maintaining proper kitchen air quality, preventing excessive steam build-up, and protecting internal components. Continuous operation with a faulty UltraVent could lead to an unpleasant work environment, potential safety hazards, or even damage to the combi oven itself.

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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