Fault B0 (Detailed 141) — Burner blocked due to flue gas sensor short circuit

What does B0 mean?

The boiler's burner is blocked because a short circuit has been detected in the flue gas temperature sensor. This sensor monitors the temperature of exhaust gases, and a short circuit can lead to incorrect readings.

• Flue gas temperature sensor shorted out

Click steps to track your progress.

1. 1

   Check the flue gas temperature sensor for any visible damage or signs of a short circuit.

2. 2

   Verify that all wiring connections to the flue gas temperature sensor are tight and undamaged.

3. 3

   Press the reset button R on your boiler.

4. 4

   If the fault persists, contact a qualified service technician to inspect or replace the sensor.