Correction - Viessmann WB1A Series Installation And Service Instructions Manual

Correction

A
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Remove front cover panel
Check boiler temperature sensor
40
20
10
8
6
4
2
1
0.8
0.6
0.4
0.2
50 86 122 158 194 230
68 104 140 176 212 248
10 30 50
20 40
Boiler water temperature in ºF/ºC
1. Remove the screw at the top of the
boiler.
2. Press down the springs on the
underside of the boiler.
3. Remove the front cover panel.
4. Lift the front cover panel from the
wall mounting frame.
1. Disconnect cables from boiler
temperature sensor A.
2. Measure resistance of the boiler
temperature sensor and compare
with resistance/boiler water
temperature curve shown on the
left.
3. If the value measured differs
significantly, replace the sensor.
The boiler temperature sensor is
immersed in the heating water (risk
of scalding).
Drain the boiler before replacing the
sensor.
70 90 110
80 100 120
60
Troubleshooting
WARNING
65