Flue Gas Levelss Incorrect, Co Levels Too High - Worcester ZWBR 7-30 R 30 HE PLUS COMBI Service Booklet

Rectifying faults
Error Fd
Flue gas levels incorrect, CO level too high
Check
1. Does the gas supply type match the
specifications on the appliance iden-
tification plate?
B Test gas supply pressure - OK?
2.
Does pressure match figure speci-
fied in installation instructions?
3. Problem with flue?
B Check CO
level in combustion
2
air.
Is CO level above 0,2 % ?
2
4. Flue gas CO levels measured at
2
min. and max. load do not match
specified levels?
B Measure CO
levels.
2
5. Gas volumetric flow too high when
CO level correctly set.
2
6.
38
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Action
↓2.
yes:
B Convert appliance to correct gas type.
no:
Flue gas levels incorrect? 2.
↓3.
yes:
B Decommission appliance.
no:
Bei Erdgas:
B Notify gas company.
b
B Check flue and repair or replace if necessary.
yes:
Flue gas levels incorrect? 4.
↓4.
no:
B Adjust CO
yes:
Flue gas levels incorrect? 5.
↓5.
no:
B Reduce gas volumetric flow rate by means of
yes:
adjusting screw on gas valve and/or gas flow
restrictor.
B Check CO
Flue gas levels incorrect? 6.
↓6.
no:
B Power OFF the appliance.
B Turn off gas cock.
B Change the gas valve.
B Open the gas cock.
B Turn ON the appliance.
B Check appliance for leaks.
level as per installation instructions.
2
adjustment.
2
7 181 465 347 (05.01)