F.91 - sensor/actuator fault on actoSTOR module

What does F.91 mean?

A sensor or actuator component within the actoSTOR module has developed a fault, affecting its operation.

• General sensor or actuator fault within the actoSTOR module.

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

   This indicates a general fault with a sensor or actuator within the actoSTOR module.

3. 3

   Contact customer service. A qualified technician will need to diagnose the actoSTOR module for specific component failures.