Viessmann VITODENS 100-W Installation And Service Instructions Manual page 58

Troubleshooting
Repairs
(cont.)
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
Replacing the flow limiter (gas condensing combi boiler)
A
B
C
Serial no.
(Type plate)
7499425
7499427
7499429
58
3. Replace the sensor in the case of
severe deviation.
1. Drain the boiler from the DHW side.
2. Pivot the control unit downwards.
3. Undo screws A.
4. Remove cap B.
5. Remove faulty flow limiter C.
6. Select new flow limiter C in accord-
ance with the boiler serial no. (see
type plate) and the following table.
7. Insert new flow limiter C.
8. Fit new cap B provided.
Flow rate
l/min
Colour
10
12
14 Brown
Black
Red