Error Code
high
Rational iCombi Pro – Error Code 7: Self-test Failed
On your iCombi Pro unit, Code 7 indicates a critical internal self-test…
Rational iCombi Pro - Error 12: CDS Sensor Fault
Caution / Monitor Closely
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 12 indicates a fault with the CDS (Conductivity Detection System) sensor. This sensor is crucial for monitoring water quality, detecting limescale, and ensuring optimal performance of cleaning and descaling cycles. You will need to inspect the sensor and its connections, and likely replace the component to restore full functionality.
Technical Details
Repair Steps:
- Safety First: Disconnect Power. Before performing any checks or repairs, ensure the RATIONAL iCombi Pro unit is completely disconnected from the main power supply to prevent electrical hazards.
- Locate the CDS Sensor. The CDS sensor is typically located in the water inlet system, within the steam generator’s water circuit, or integrated into a manifold responsible for water management. Refer to your unit’s technical documentation or wiring diagrams for its precise location.
- Inspect Electrical Connections. Carefully check the wiring harness connected to the CDS sensor. Look for any signs of loose connections, corrosion, pinched wires, or damage to the connector itself. Secure any loose connections or repair damaged wiring.
- Examine the Sensor Probe. The CDS sensor probe extends into the water flow. Inspect it for signs of excessive limescale buildup, physical damage, cracks, or foreign debris that might be fouling the sensor’s ability to accurately read water conductivity. Clean off any light scale with a mild descaling solution, but avoid abrasive materials.
- Test Sensor Functionality (Advanced). If you have the appropriate diagnostic tools (e.g., multimeter with conductivity measurement capabilities, or a RATIONAL service tool), you can attempt to test the sensor’s output or resistance values. Compare these readings against the manufacturer’s specifications. A sensor that gives an open circuit, short circuit, or erratic readings is likely faulty.
- Replace the CDS Sensor. If the connections are sound and the sensor probe shows signs of damage, heavy scaling, or tests as faulty, the most common solution is to replace the CDS sensor. Ensure you use an original RATIONAL spare part to maintain compatibility and reliability.
- Clear Error Code and Test. After replacing the sensor and reassembling the unit, restore power. Navigate to the error log or diagnostic menu on the iCombi Pro’s SmartPanel and clear the error code. Initiate a test cycle or a cleaning program to confirm the fault has been resolved and the sensor is functioning correctly.
Common Questions:
Q: What is a CDS sensor in my RATIONAL iCombi Pro?
A: The CDS (Conductivity Detection System) sensor is a critical component that continuously monitors the conductivity of the water supply. It plays a vital role in detecting limescale buildup, managing water quality for cooking processes, and ensuring the automatic cleaning and descaling systems function effectively.
Q: Can I continue using my iCombi Pro if error code 12 appears?
A: While the oven may still operate, continued use with a faulty CDS sensor is not recommended. It compromises the unit’s ability to monitor water quality and manage descaling, which can lead to rapid limescale buildup in the steam generator and heating elements, potentially causing more severe and costly damage over time.
Q: How can I prevent CDS sensor faults in the future?
A: Regular preventive maintenance is key. Ensure your water filtration and softening systems are properly maintained and replaced as scheduled. Periodically inspect the sensor during routine service checks for limescale buildup and clean it gently if necessary. Using RATIONAL’s recommended cleaning and descaling products also helps maintain water system health.
When to call a technician
Consider calling a certified technician if:
- The error keeps coming back after you've tried the steps above.
- You're not comfortable doing the checks or repairs yourself.
- You notice unusual noise, smell, or behaviour.
- Equipment is under warranty and you want official service.
- You need the unit back in service quickly with minimal downtime.