F.446 — Burner in a fault state (Deviation, boiler supply temperature sensor/high limit safety cutout)

What does F.446 mean?

The burner is in an error state due to a deviation detected in the boiler's supply temperature sensor or the high limit safety cutout. This could mean a sensor is providing incorrect readings.

• Supply temperature sensor faulty
• High limit safety cutout faulty
• Plug-in connection or lead to sensor faulty

Click steps to track your progress.

1. 1

   Reset the appliance.

2. 2

   If the fault recurs, contact a qualified technician to check the supply temperature sensor/high limit safety cut-out.

3. 3

   Ensure all plug-in connections and leads to the sensor are secure.