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Diagnosis and fault messages
Checking the temperature sensors
Viessmann NTC 10 k
(blue marking)
Ω
20
10
8
6
4
2
1
0.8
0.6
0.4
10
30
50
Temperature in °C
Fig. 16
Checking the fuses
1. Turn off the power supply.
2. Open the pump module (see chapter "Wall mount-
ing").
40
70
90
110
1. Pull out corresponding plug.
2. Check the sensor resistance. Compare with the
curve.
3. If there is considerable deviation, check the instal-
lation. Replace sensor if required.
3. Check the fuse. Replace if necessary (see "con-
nection and wiring diagram").
Danger
Incorrect or improperly fitted fuses can lead
to an increased risk of fire.
■
Insert fuses without using any force. Posi-
tion fuses correctly.
■
Only use structurally identical types with
the specified response characteristics.
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