Bosch GWI-N Series Training And Service Information page 60

A4
Fault in the air flow NTC sensor
Component Characteristic: NTC temperature sensor (220 kΩ)
Lock Out Error
The Air NTC sensor is
interrupted or in short
circuit
Refer to table with
values in Service
Manual
See spare part list
See spare part list
Page 60 from 76
Burner shutdown
Assure NTC cable harness is connected
in control unit
Unplug the NTC connection and measure
the NTC electrical resistance [R] (Ω)
[R] > 1300 kΩ or < 8.2 kΩ
Yes
NTC values out of
range
Change wiring
Plug connection wire
and turn ON unit
Problem solved?
No
Change wiring
Problem solved?
No
Replace control unit
6 720 814 719 SM FP_Australia 2017/04 EN
No
[R] = ∞ Ω
Yes
NTC interrupted
Yes
End
Yes
No