Apparently, CI2 BCUs can be trained. See the note below.

After a BCU update or replacement the steps below should be completed.

This might help a boiler that has intermittent faults.

We recommend running both burners in actuator test three times in low, for 3 to 5-minutes. (less than 6-minutes) and two times in high, also for between 3 to 5-minutes.

Cause a regular shutdown before the fault appears (Remove the demand for heat by lowering the setpoint value below the water temperature)

Repeat up to 5 times until the burner can run for more than 10 minutes without an F.889 fault.

Replacement BCU and HMU units must be configured prior to installation in Vitocrossal 200 CI2

Applies to: Vitocrossal 200, CI2 Series (all models)

Issue:

If a replacement Burner Control Unit (BCU) or Heat Management Unit (HMU) is not configured before it's installed in a Vitocrossal 200 CI2 boiler, then the boiler will display an error and it will not be able to operate.

This is by design – these parts need to be configured for a specific boiler before they are installed.

Currently, the configuration process for BCU and HMU units for Vitocrossal 200 CI2 can only be performed using Viessmann's proprietary software "Service Assistant", which is not publicly available.

The ViGuide mobile app is not capable of configuring BCU or HMU units for Vitocrossal 200 CI2 at this time.

For this reason, these BCU and HMU parts should not be stocked outside of Viessmann.

If a "blank" BCU or HMU is sent to a customer, it will not work in their Vitocrossal 200 CI2 boiler.

Resolution:

Before a replacement BCU or HMU unit is installed in a Vitocrossal 200 CI2 boiler, it must be configured using Viessmann's "Service Assistant" software.