F.446 — Burner in fault state due to temperature sensor deviation

What does F.446 mean?

The burner is in a fault state due to a deviation in the boiler supply temperature sensor or an issue with the high limit safety cutout. This is a safety measure.

• Deviation in boiler supply temperature sensor
• High limit safety cut-out issue
• Faulty plug-in connection or lead to sensor

Click steps to track your progress.

1. 1

   Check the boiler supply temperature sensor and the high limit safety cut-out for any visible damage.

2. 2

   Examine the plug-in connection and lead to the sensor for loose contacts or damage.

3. 3

   Reset the boiler by briefly turning off and on its power supply.