F.13 - Warm start sensor/cylinder sensor short circuit

What does F.13 mean?

There is a short circuit in the warm start sensor or the cylinder sensor (NTC). This applies to boilers with integrated hot water generation or with an actoSTOR module (in combination with F.91).

• NTC sensor is defective.
• Short circuit in the cable harness.
• Cable is shorting to the casing.

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

   If you have integrated hot water generation, this points to a short circuit in the warm start sensor.

3. 3

   If you have an actoSTOR module, this indicates a short circuit in the cylinder sensor (in combination with F.91).

4. 4

   Contact customer service for diagnosis of the NTC sensor and cable harness.