ABB Robot Error 50085 – Internal Temperature Sensor Fault: Causes and Fix

Quick Fix for ABB Error 50085

If this error appears, try these immediate actions:

• Restart the ABB IRC5 Controller using FlexPendant
  
• Check for abnormal overheating inside the cabinet
  
• Inspect controller environment for high ambient temperature
  
• Verify no recent hardware changes or wiring issues
  

Quick resets may resolve temporary sensor faults.

ABB Robot Error 50085 – Internal Temperature Sensor Fault occurs when the ABB IRC5 Controller detects an abnormal signal or failure from its internal temperature monitoring system.

What Does ABB Error 50085 Mean?

Error 50085 indicates that the controller is unable to reliably read internal temperature data, which may prevent proper thermal protection.

This is critical because:

• The controller cannot detect overheating accurately
  
• Cooling system logic may not function correctly
  
• Risk of hardware damage increases
  

Affected areas include:

• Internal temperature sensors (NTC/PTC sensors)
  
• Main control board
  
• Drive modules
  
• Cooling system monitoring circuits
  

Common Causes of ABB Error 50085

Faulty Temperature Sensor

Sensors may fail due to aging, electrical damage, or manufacturing defects.
Common issues include:

  1. Inaccurate temperature readings
  2. Sensor failure over time
  3.Damaged sensor components

Replacing the defective sensors restores reliable temperature monitoring and prevents overheating.

Loose or Damaged Wiring

Broken or loose connections can interrupt temperature signal feedback.
Common issues include:

  1.Unstable or missing temperature signals
  2. Corroded or worn-out wiring
  3. Poor connections disrupting sensor data

Securing or replacing faulty wiring ensures accurate signal transmission for proper temperature regulation.

Controller Board Issues

Faults in the mainboard or I/O circuits can affect sensor readings.

Electrical Interference

Noise or unstable power can distort sensor signals.

Firmware or Software Glitch

Occasional system errors may trigger false alarms.

How to Troubleshoot ABB Error 50085

Step 1: Restart the Controller

• Perform a full restart via FlexPendant
  
• Check if the error clears
  

Step 2: Check for Overheating

• Inspect cabinet temperature
  
• Ensure fans and ventilation are functioning
  

Step 3: Inspect Wiring and Connections

• Check sensor wiring for loose or damaged connections
  
• Secure or replace faulty cables
  

Step 4: Inspect Controller Hardware

• Check control boards and modules for visible damage
  
• Look for burn marks or overheating signs
  

Step 5: Update or Reload Firmware

• Ensure controller software is up to date
  
• Reload system parameters if needed
  

Step 6: Replace Faulty Components

• Replace defective temperature sensors
  
• Replace controller boards if necessary
  

Step 7: Test System Stability

• Restart and monitor temperature readings
  
• Ensure stable operation during production
  

Related Components That May Be Affected

• Internal temperature sensors (NTC/PTC)
  
• Main control board (IRC5)
  
• Drive modules
  
• Cooling system (fans, filters)
  

When Should You Replace Components?

Replacement is recommended if:

• Sensor readings are unstable or missing
  
• Error persists after restart and wiring checks
  
• Controller shows signs of overheating or board damage
  
• Cooling system is functioning but error remains
  

💡 Need Replacement Parts or Repair Support? (High-Converting CTA)

Temperature sensor faults can lead to undetected overheating and major failures:

👉 Browse our ABB spare parts inventory for temperature sensors, control boards, cooling fans, and IRC5 modules.

Preventing Temperature Sensor Faults

• Maintain stable operating temperature
  
• Regularly inspect wiring and connections
  
• Keep cooling system clean and functional
  
• Avoid electrical noise and unstable power
  
• Perform periodic controller diagnostics
  

Related ABB Robot Error Codes

• ABB Error 50081 – Cooling Fan Failure
• ABB Error 50082 – Controller Overtemperature
• ABB Error 50083 – Cooling System Failure
• ABB Error 50084 – Cabinet Ventilation Blocked
• ABB Error 50056 – Drive System Error
• ABB Error 50035  – Controller Fieldbus Module Fault
  

Understanding these related faults can help identify underlying mechanical or electrical issues. For a complete list of ABB robot error codes and troubleshooting solutions, refer to our full ABB error code guide.

Recommended Parts for ABB Error 50085

• ABB Power Supply
• ABB PCB Boards
• Cooling Fan

Conclusion

ABB Robot Error 50085 – Internal Temperature Sensor Fault indicates a failure in the controller’s temperature monitoring system. This can compromise overheating protection and must be addressed promptly.

By checking wiring, verifying cooling performance, and replacing faulty sensors or boards, engineers can restore safe and stable robot operation.

Quick Guide: Troubleshooting ABB Error 50085 FAQ

1. What causes ABB Error 50085?

It is usually caused by faulty temperature sensors, wiring issues, controller board faults, or electrical interference.

2. How do I fix Error 50085?

Restart the controller, check cooling conditions, inspect wiring, and replace defective sensors or boards if needed.

3. Is this error dangerous?

Yes, because it disables reliable temperature monitoring and increases the risk of overheating.

4. Can firmware issues cause this error?

Yes, in rare cases software glitches can trigger false sensor alarms.