Heatsink overtemperature (C0122)

What does OH4 mean?

The heatsink temperature has exceeded the threshold set in C0122. Causes include ambient temperatures above +40°C or +50°C, a dirty heatsink, an incorrect mounting position, or the value specified under C0122 being set too low.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Clean the heatsink if it is very dirty to improve heat dissipation.

2. 4

   Change the mounting position if it is hindering airflow.

3. 5

   Enter a higher value under C0122 if the threshold is set too low.

4. 6

   Switch off monitoring by setting C0582 = 3.