Error Code
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Rational CM – Error E24: CombiMaster Error – Software Update Required
On your CombiMaster unit, error code E24 indicates that a software update…
Rational CM - Error E15: PCB Temperature Above 85°C (185°F), Change Air Filter
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 E15 indicates that the main PCB's temperature has exceeded 85°C (185°F), primarily due to insufficient cooling. This often points to a clogged air filter or obstructed cooling fins. Promptly address this by inspecting and cleaning the air filter and ensuring adequate airflow to prevent component damage and maintain machine reliability.
Technical Details
Repair Steps:
- Safety First: Disconnect the RATIONAL CombiMaster from the main power supply before performing any inspections or maintenance. This is crucial for electrical safety.
- Inspect Air Filter: Locate the air filter, typically on the side or rear of the unit. Remove it and thoroughly inspect its condition. If it’s clogged with dust, grease, or debris, clean it thoroughly with warm, soapy water and allow it to dry completely, or replace it with a genuine RATIONAL replacement air filter.
- Clean Cooling Fins and Fan: With the unit still powered off, access the area around the main PCB, which is usually behind the control panel. Use compressed air or a soft, non-static brush to carefully remove any accumulated dust or debris from the PCB’s cooling fins and the cooling fan blades. Ensure there are no physical obstructions blocking airflow.
- Verify Cooling Fan Operation: Reconnect power momentarily (with extreme caution and only if safe to observe) or observe during startup. Confirm that the PCB cooling fan is spinning freely and effectively moving air. If the fan is not operating, or makes unusual noises, it may indicate a motor fault and require replacement.
- Check Ambient Conditions: Ensure the installation environment provides adequate clearance for proper ventilation around the CombiMaster unit, as specified in the installation manual. Verify that the ambient kitchen temperature is within the manufacturer’s specified operating range, as high ambient temperatures can contribute to PCB overheating.
- Monitor Temperature: After cleaning, replacement, and reassembly, power on the unit and monitor if the E15 error reoccurs during operation. If the error persists, there might be a more significant underlying issue with the PCB’s temperature sensor or the PCB itself.
- Professional Service: If the issue is not resolved after performing these steps, or if you suspect a component failure (e.g., faulty fan motor, sensor, or PCB), contact a certified RestoFixer technician. Persistent high PCB temperatures can lead to irreversible damage and system failure.
Common Questions:
Q: What does RATIONAL CombiMaster error E15 indicate?
A: Error E15 signifies that the main PCB (Printed Circuit Board) temperature has risen above 85°C (185°F), indicating a critical overheating condition, usually due to restricted airflow to the electronic components.
Q: How often should I clean or replace the air filter on my CombiMaster?
A: The air filter should be inspected regularly, at least monthly in high-volume commercial kitchens, and cleaned or replaced as necessary. Annual replacement is generally recommended to ensure optimal cooling performance and prevent thermal issues.
Q: Is it safe to continue using the CombiMaster with an E15 error?
A: No, it is strongly advised to cease operation immediately. Continued use with an overheated PCB can lead to permanent damage to sensitive electronic components, resulting in costly repairs or complete system failure and potential safety hazards.
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.