Bosch GWI-N Series Training And Service Information page 59

A1
Temperature inside room sealed box and detected by air flow NTC sensor is > 70ºC
Component Characteristic: NTC temperature sensor (220 kΩ type)
Warning Message
closed
Temperature inside
box is high
Refer to table with
values in Service
Manual
Power Reduction
Procedure
Start condition:
T air > 70ºC
Power lower in 5 % / 30 sec
Stop Condition:
T air < 70ºC
Note: when maximum power
reduction is 20 % or T air > 80ºC
E4 is displayed
See spare part list
Heat Cell includes heat
exchanger sealing with
burner / flue collector
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Appliance keeps operation and code is flashing until tap is
Check position of sensor (attached
at back cover of control unit)
NTC out of place and
touching hot surface ?
No
Measure the NTC electrical
resistance [R] (Ω)
[R] Ω = Current T air (ºC) ?
No
Replace wiring
Evidences of leakages
through sealing's or HE
overheat?
Yes
Correct problem by
inspecting and/or
replacing gaskets /
sealings in Heat Cell
6 720 814 719 SM FP_Australia 2017/04 EN
Yes
Correct position and fix
NTC in original position
Yes
Check origin of high
temperature inside box
No
End