Check Vitotronic 200-H (Accessory) - Viessmann Vitodens 200-W Series Installation And Service Instructions Manual

Troubleshooting
Repair
(cont.)
Changing the rotational direction of the mixer motor (if required)
gS
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BU
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Fig. 53
Check flow temperature sensor
Pressure drop curve
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
Fig. 54 Sensor type: NTC 10 k
1. Disconnect plug (flow temperature sensor).
?

Check Vitotronic 200-H (accessory)

The Vitotronic 200-H is connected to the control unit
via the LON. To test the connection, carry out a sub-
scriber check at the boiler control unit (see page 43).
90
Ω
1. Remove the upper casing cover of the extension
kit.
Danger
An electric shock can be life-threatening.
Before opening the boiler, disconnect from
the mains voltage, e.g. at the fuse or the
mains isolator.
2. At plug , swap the cores at terminals "
gS
" ".
~
3. Refit the casing cover.
2. Check the sensor resistance and compare it with
the curve.
Replace the sensor in the case of severe deviation.
" and
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