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 E17: B5 Steam Generator Sensor Below -5°C (23°F)
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 CombiMaster unit, error E17 indicates the B5 steam generator sensor is reporting an abnormally low temperature (below -5°C). This typically points to a faulty sensor, damaged wiring, or a poor connection, critically affecting steam production. You must inspect the sensor and its connections, performing continuity and resistance checks to identify the root cause.
Technical Details
Repair Steps:
- Safety First: Immediately disconnect the CombiMaster unit from its electrical power supply to prevent any electrical hazards. Allow the unit to cool down completely before proceeding.
- Access the Steam Generator: Locate and carefully remove the necessary rear or side panels to gain access to the steam generator compartment. Refer to your CombiMaster’s service manual for exact panel removal instructions specific to your model.
- Locate the B5 Sensor: Identify the B5 temperature sensor, which is typically threaded or bolted into the wall of the steam generator tank. It’s usually a PT1000 or NTC type sensor.
- Inspect Wiring and Connections: Thoroughly examine the wiring harness connected to the B5 sensor. Look for any signs of physical damage, chafing, corrosion on terminals, or loose connections. Secure any loose wires or clean corroded contacts.
- Test Sensor Resistance: Disconnect the B5 sensor from the main PCB harness. Using a multimeter, measure the resistance across the sensor’s terminals. Compare this reading to the expected resistance values for a PT1000 or NTC sensor at ambient temperature (refer to the RATIONAL service manual for precise specifications). A reading significantly out of range (e.g., open circuit or short circuit) confirms a faulty sensor.
- Check for Environmental Factors: Inspect the steam generator and the sensor’s mounting point for excessive scale buildup or moisture ingress that could be affecting the sensor’s reading or electrical connection.
- Replace Faulty Components: If the sensor tests faulty, carefully remove the old B5 steam generator sensor and install a new, genuine RATIONAL replacement. If wiring damage is evident, repair or replace the affected section of the wiring harness.
- Reassemble and Test: Securely reassemble all panels, ensuring all connections are tight. Restore power to the CombiMaster and perform a test run to verify that the E17 error has cleared and steam generation functions correctly.
Common Questions:
Q: What does the B5 steam generator sensor do?
A: The B5 sensor is crucial for monitoring the temperature within the CombiMaster’s steam generator, providing essential data to the control board for precise steam production and temperature regulation during cooking cycles.
Q: Can I clear the E17 error without replacing the sensor?
A: While a power cycle might temporarily clear the E17 error, it will likely reappear if the B5 sensor itself is faulty or there’s a persistent wiring issue. A proper diagnosis and replacement of defective components are usually necessary for a permanent fix.
Q: What happens if I ignore the E17 error on my CombiMaster?
A: Ignoring the E17 error can lead to your CombiMaster unit failing to produce steam correctly, operating erratically, or completely shutting down to prevent damage, severely impacting your kitchen’s operations.
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.