116
Draining the boiler on the heating water side
1.
Close the shut-off valves on the heat-
ing water side.
2.
Route hose at drain valve
A
into a
suitable container or drain outlet.
3.
Open drain valve
A
and drain the
boiler as much as required.
Checking the outside temperature sensor (weather-compensa-
ted control unit)
X3
100
10
-20 -10 0 10 20 30
Temperature in °C
6
8
20
40
60
80
200
Resistance in kΩ
1.
Pull plug "X3" from the control unit.
Troubleshooting
Repairs
(cont.)
5457 552 GB
Summary of Contents for FS2B
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