Conditions

B2380





Circulation pump. Short to B+
Circulation pump. Open circuit/short to ground

Fault symptoms
The perceived cabin temperature is too low compared to the set temperature.

Conditions
The following conditions apply:
- A short to B+ is indicated when the output for the circulation pump is activated and the voltage on pin 23 exceeds 6 V.
- A short to ground is indicated when the output for the circulation pump is not activated and the voltage on pin 23 exceeds 6 V.
- Measured every 440 ms and 5 consecutive measurements are required to set a diagnostic trouble code.
- The diagnostic trouble code is deleted after the ignition has been turned on 20 times if the fault conditions have not been fulfilled.
- When the diagnostic trouble code has been set the output is switched off.