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Troubleshooting
Repairs
(cont.)
Check collector temperature sensor
100
10
1
0.1
0
20
25
40
Temperature in °C
Fig. 54
Sensor type: NTC 20 k
1. Disconnect plug TS2
ule. Measure the resistance.
2. Compare the sensor resistance to the curve.
Fault during commissioning (fault F.416)
During commissioning, the control unit checks for cor-
rect placement of the flue gas temperature sensor. If
fault message F.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.
Information on replacing the HMU heat management unit and BCU burner control unit
If the burner control unit (BCU) is being replaced, com-
missioning is carried out with the "Service assistant"
software tool.
Replacing the power cable
When replacing the power cable, only use the power
cable available as a spare 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.
102
60
80
100
Ω
from the electronics mod-
&
120
140
3. In the event of severe deviation (> 10 %), replace
the sensor.
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 F.416 continues to be displayed
although the flue gas temperature sensor has been
correctly positioned: Initial commissioning may result in
burner faults e.g. caused by air in the gas line. Elimi-
nate the fault and unlock the device.
Spare part installation instructions and
"www.service-assistent.info"
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