F.71 — Flow NTC reports constant value (stuck)

What does F.71 mean?

The boiler's flow NTC (Negative Temperature Coefficient) sensor is reporting a constant temperature value, meaning it is "stuck" and not registering changes. This indicates a defective sensor.

• Flow NTC is defective.

Click steps to track your progress.

1. 1

   Reset the boiler by pressing the reset button.

2. 2

   Power off the boiler, wait a moment, then power it back on.

3. 3

   If the error persists, contact a qualified service technician to inspect or replace the flow NTC sensor.