Error Code
low
Rational CM – Error E24: CombiMaster Error – Software Update Required
On your CombiMaster unit, error code E24 indicates that a software update…
Rational CM - Error E6: B5 Steam Generator Sensor Defective
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 CombiMaster unit, error code E6 indicates a defective B5 steam generator sensor. This sensor is crucial for monitoring steam production temperature and can lead to incorrect steaming or operational issues. Inspect and replace the sensor if it's confirmed faulty to restore proper steam generation.
Technical Details
Repair Steps:
- Safety First: Always disconnect the RATIONAL CombiMaster from its main power supply and water connection before attempting any service or inspection.
- Locate the B5 Sensor: The B5 sensor is typically a temperature sensor (often an NTC thermistor) located on the steam generator (boiler) of your RATIONAL CombiMaster. Access usually requires removing the rear or side panels.
- Visual Inspection: Carefully inspect the sensor and its wiring for any visible signs of damage, such as corrosion, burnt insulation, melted plastic, or loose connections at the terminal block or on the main control PCB.
- Test Sensor Resistance: Using a multimeter, measure the resistance across the sensor’s terminals. Compare the measured resistance to the specified values in the RATIONAL service manual for your specific CombiMaster model at ambient temperature. A significant deviation indicates a faulty sensor.
- Check Wiring Continuity: Test the continuity of the wiring harness connecting the B5 sensor to the main control PCB. Look for open circuits or short circuits, which could mimic a sensor fault.
- Replace Defective Sensor: If the sensor is confirmed faulty (either by visual damage, incorrect resistance readings, or wiring issues), replace it with a genuine RATIONAL replacement part. Ensure proper sealing if it’s a probe-type sensor.
- Reassemble and Test: Securely reattach all panels, restore power and water, and test the CombiMaster’s operation, particularly steam generation functions, to ensure the E6 error is resolved.
Common Questions:
Q: What is the primary function of the B5 steam generator sensor in a RATIONAL CombiMaster?
A: The B5 sensor monitors the temperature within the steam generator, ensuring it reaches and maintains the correct temperature for efficient steam production. This is critical for cooking modes requiring steam.
Q: Can a RATIONAL CombiMaster operate with a defective B5 steam generator sensor?
A: While the unit might attempt to operate, a defective B5 sensor will prevent accurate steam generation and temperature control, likely resulting in poor cooking results, extended heating times, or the unit stopping operation with the E6 error.
Q: Is replacing the B5 steam generator sensor a complex task for a technician?
A: For experienced commercial kitchen technicians, replacing the B5 sensor is generally a straightforward task, primarily involving panel removal, electrical disconnection, and reinstallation. Calibration is typically not required for this type of NTC sensor.
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.