F.473 - Heat Management Unit (HMU) communication error

What does F.473 mean?

There is a communication error between the BCU burner control unit and the HMU heat management unit. This usually points to a problem with the connecting cable between these two components.

• HMU heat management unit communication error
• Faulty connecting cable between BCU burner control unit and HMU heat management unit

Click steps to track your progress.

1. 1

   Check the connecting cable between the BCU burner control unit and HMU heat management unit for secure connections and damage.

2. 2

   Reset the boiler by turning it off and on again.

3. 3

   If the issue persists, contact a qualified service technician.