Viessmann B1HF Installation And Service Instructions Manual page 87

Repairs
(cont.)
Flue gas temperature sensor
■
Flow temperature sensor
■
Cylinder temperature sensor
■
Outlet temperature sensor
■
Temperature sensor, low loss header
■
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70
Temperature in °C
Sensor type: NTC 10 k
Ω
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.
Check temperature sensors at EM-S1 extension (ADIO electronics module) or at SDIO/SM1A electronics
module
Check temperature sensors: Installation and
service instructions of relevant accessory.
90 110
Outside temperature sensor
■
200
100
80
60
40
20
10
8
6
-20 -10 0 10 20
Temperature in °C
Sensor type: NTC 10 k
Ω
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.
Troubleshooting
30
87