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ErrorLib — Industrial Fault Code Library

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26040

Heat sink temperature too high, KPP/KSP (axis)

Kuka · KR C4 Controller

What does 26040 mean?

This fault indicates an overtemperature condition on the heat sink of a KPP or KSP drive unit for an axis. Prolonged high temperatures can degrade component lifespan and lead to drive shutdown.

Common Causes

  • High ambient temperature around the cabinet
  • Excessive load in the robot program causing high heat generation
  • Dirt or obstruction in the cooling circuit of the drive
  • Blocked ventilation slits or insufficient clearance at the installation site

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check cabinet fan for proper operation and air flow.

  2. 2

    Measure ambient temperature around the KPP/KSP cabinet.

  3. 3

    Inspect cooling circuit for dirt or obstructions and clean as necessary.

  4. 4

    Verify installation site for adequate ventilation slits and clearance.

  5. 5

    Reinitialize the drive bus by cycling Power Off / Power On.

  6. 6

    Check the KSP module for any other anomalies.

Browse all codes in this manual (21)
Verified technical data. Last updated: April 2026

Related Faults

26031Internal error, KPP/KSP (axis)26032IxT overload error, KPP/KSP (axis)26033Ground fault, KPP/KSP (axis)
Source: Kuka KR C4 Controller
Open Manual (Page 158)Search more codes in this manual