144
6.
Check the connections on the heat-
ing water and DHW side for contam-
ination and scaling; if required,
replace the plate heat exchanger.
7.
Install in reverse order using new
gaskets.
Checking the flue gas temperature sensor
The flue gas temperature sensor locks
out the boiler when the permissible flue
gas temperature is exceeded. Reset the
interlock after the flue system has cooled
down by pressing reset button
R
.
10
1
10 30 50 70 90 110
Temperature in °C
0.4
0.6
0.8
2
4
6
8
20
Resistance in k
Ω
Sensor type: NTC 10 kΩ
1.
Pull leads from flue gas temperature
sensor
A
.
2.
Check the sensor resistance and
compare it with the curve.
3.
Replace the sensor in the case of
severe deviation.
Fault "A3" during commissioning
During commissioning, the control unit
checks whether the flue gas temperature
sensor is correctly positioned.
If the flue gas temperature sensor is not
positioned correctly, commissioning is
cancelled and fault message A3 is dis-
played.
1.
Check whether the flue gas temper-
ature sensor is correctly inserted.
See previous diagram.
Troubleshooting
Repair
(cont.)
5773 216 GB
Summary of Contents for Vitodens 222-F B2TA series
Page 12: ...12 2 5 1 4 2x 3 Installing the boiler Removing the front panels 5773 216 GB...
Page 13: ...13 1 2 SW17 Installing the boiler Siting and levelling the boiler 5773 216 GB Installation...
Page 31: ...31 4 1 5 2 2x 3 Installing the boiler Fitting the front panels 5773 216 GB Installation...
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