7 181 465 347 (01.07)
Rectifying faults
19
A 7
flashing.
Hot water NTC sensor defective
Check
Action
1.
B
Activate menu option
Show service parameters
.
B
Select
.2 Hot water temp.sensor
.
Is a temperature between
0.
and
5.
displayed?
yes:
B
Is the connector for hot water NTC sensor corro-
ded
1)
, damaged or dirty? Replace affected com-
ponents.
↓
2.
1)
For notes, refer to Appendix.
no:
↓
3.
2.
B
Disconnect connector for hot
water NTC sensor.
B
Short-circuit the 2-pin connector
on the end of the 20-pin connector
lead assembly.
Display changes to temperature
between
100.
and
95.
?
yes:
B
Power OFF the appliance.
B
Change hot water NTC sensor.
B
Plug the connection wire.
B
Turn ON the appliance.
A7?
↓
3.
no:
B
Change the 20-pin connector lead assembly.
↓
3.
3.
Temperature between
95
. and
100.
is
displayed.
B
Unplug the connector.
After max. 60 sec.:
Does the displayed code change
to a value between
0.
and
5.
?
yes:
B
Power OFF the appliance.
B
Change hot water NTC sensor.
B
Plug the connection wire.
B
Turn ON the appliance.
A7?
↓
4.
no:
↓
4.
4.
B
Unplug the 20-pin connector lead
assembly from the Heatronic.
After max. 60 sec.:
Does the displayed code change
to a value between
0.
and
5.
?
yes:
B
Change the 20-pin connector lead assembly.
no:
B
Power OFF the appliance.
B
Disconnect the boiler electrical connection.
B
Change PCB control board.
B
Reconnect the boiler electrical connection.
B
Turn ON the appliance.
Summary of Contents for ICC2 combi ZWBR 11-37 ICC2
Page 51: ...6 720 610 602 GB 03 02 Appendix 51 ...
Page 102: ...7 181 465 347 01 07 50 Appendix ...
Page 103: ...7 181 465 347 01 07 Appendix 51 ...
Page 104: ...Appendix ...
