Checking The Fuses - Viessmann Vitotronic 200 Installation And Service Instructions For Contractors

Troubleshooting
Checking temperature sensors
Viessmann NTC 20 k (orange ID label)
Ω
40
20
10
1
0.1
0 20 40
Temperature in °C
Fig. 44
1. Pull out plug
aG .
2. Check the sensor resistance and compare it to the
curve.

Checking the fuses

1. Switch OFF the power supply.
2. Open the control unit.
3. Check the fuses. Replace if necessary (see con-
nection and wiring diagram).
Danger
Using the wrong fuses or inserting them
incorrectly can lead to an increased risk of
fire.
■ Do not use force to insert the fuses. Posi-
tion the fuses correctly.
Only use structurally identical types with
■
the stated response characteristics.
108
(cont.)
60 80 100 120 140 160 180
3. In the case of severe deviation, check sensor
installation and replace the sensor if required.
200