Bosch GWI-N Series Training And Service Information page 56

8.1) Problems without error codes
Combustion noise too high
Gas supply type according
appliance gas type ?
Yes
Gas supply pressure (static /
dynamic) according IM ?
Yes
Check exhaustion system for
eventual recirculation of
combustion products (cross
contamination)
Problem solved ?
End
Without Front Cover
CO2 (G20) ≈ 5.5%
(+/-0.2%)
CO2 (G31) ≈ 6.6%
(+/-0.2%)
Temp gases máx ≈ 170ºC
Temp. gases min ≈ 45ºC
With Front Cover
Máx CO2 = CO2 without front
cover + 0.3 %
ATTENTION:
Adjustments of ΔP are done
without front cover
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No
Convert appliance according IM
(check existence of EF codes in
memory)
No
Assure gas supply pressure,
testing appliance at
maximum and minimum
Clearances for air admission
/ flue discharge according IM
/ Sealing between flue pipes
and appliance
No
Measure CO2 value (at flue
measurement point) in
maximum power with /
without front cover
Emissions according
specification ?
Yes
End
ATTENTION:
CO2 > nominal = flue
recirculation
CO2 increasing > 0.3%
difference from cover Off to
cover On = flue recirculation
6 720 814 719 SM FP_Australia 2017/04 EN
In case of need
contact gas supplier
Cross contamination
persist / Combustion
No
not ok
Adjust appliance by
confirming ΔP1 / ΔP2
according IM
Note: check air / gas
measurement
independently to be sure
reading is ≠ 0 and then
check ΔP