F.84 - Implausible flow/return temperature sensor difference

What does F.84 mean?

The flow and return temperature sensors are reporting values that are implausible when compared to each other, indicating potential incorrect installation.

• Flow and return temperature sensors have been inverted (switched).
• Flow and return temperature sensors have not been correctly installed.

Click steps to track your progress.

1. 1

   Press the reset button on the boiler display up to three times to try and clear the fault.

2. 2

   Contact customer service. This fault indicates that the flow and return temperature sensors are reporting implausible values, possibly due to incorrect installation or being inverted.

3. 3

   A qualified technician will need to verify the correct installation and function of these sensors.