F72 Fault — Flow/return temperature difference too great (Delta-T high)

What does F72 mean?

The temperature difference between the flow and return NTC sensors is too high, indicating a problem with one or both sensors.

• Flow and/or return temperature sensor defective

Click steps to track your progress.

1. 1

   Check the resistance of both the flow and return thermistors (requires specialist tools).

2. 2

   Check the continuity of the wiring harness for both sensors (requires specialist tools).

3. 3

   If resistance and continuity are fine, a technician should inspect the sensors and system for other issues.