Replacing The Hbmu Heat Management Unit; Replacing The Power Cable; Replacing The Hmi Connecting Cable - Viessmann Vitodens 050-W Installation And Service Instructions Manual

Troubleshooting
Repairs
(cont.)
Fault during commissioning (fault message 416)
During commissioning, the control unit checks for cor-
rect placement of the flue gas temperature sensor. If
fault message 416 is displayed:
1. Check whether the flue gas temperature sensor is
correctly installed (bayonet fitting). See previous
diagram.
2. If required, correct the position of the flue gas tem-
perature sensor.
3. Check the flue gas temperature sensor resistance.
See previous chapter. Replace faulty flue gas tem-
perature sensor if required.

Replacing the HBMU heat management unit

Note
If replacing the HBMU heat management unit,
"ViGuide" must be used.

Replacing the power cable

When replacing the power cable, only use the power
cable available as an individual part from Viessmann.

Replacing the HMI connecting cable

!
Please note
Incorrect routing of the cable can lead to heat
damage and impairment of the EMC properties.
For positioning and securing of the cable (fixing
point of the cable tie) see connecting cable
installation instructions.
78
4. Turn off the ON/OFF switch.
5. Turn the ON/OFF switch back on.
Restart the commissioning assistant.
6. Check for leaks on the flue gas side.
Note
If fault message 416 continues to be displayed
although the flue gas temperature sensor is correctly
positioned: Initial commissioning may result in burner
faults e.g. caused by air in the gas line. Eliminate the
fault and reset the appliance.
See spare part installation instructions and inter-
net address: www.viguide.info