F13 - Cylinder sensor short circuit

What does F13 mean?

The Vaillant Ecotec Plus Boilers indicate a short circuit with the cylinder sensor. This can happen in combination products with a warm start sensor or with an actoSTOR module, pointing to an electrical fault with the sensor's circuit.

• Defective NTC sensor.
• Short circuit in the cable harness.
• Damaged cable or sensor casing.

Click steps to track your progress.

1. 1

   Verify the NTC sensor is connected properly and securely to the boiler.

2. 2

   Examine the cable harness for any visible damage, wear, or short circuits.

3. 3

   If you have the necessary tools, check the resistance of the NTC sensor and the harness continuity.

4. 4

   If the fault code remains, seek assistance from a professional heating engineer.