Worcester CDi Combi N.G Service Booklet page 55

Ignition too harsh, ignition poor
Check
7. B Test gas supply pressure - OK?
Does pressure match figure
specified in installation
instructions?
8. Problem with flue?
B Check CO level in combustion air
2
in the flue (with outer casing
fitted).
Is CO level above 0.2%?
2
9. Flue gas CO levels measured at
2
min. and max. load do not match
specified levels?
B Measure the CO
10. Burner incorrectly fitted or
defective?
B Switch OFF the appliance.
B Turn off gas valve.
B Remove burner.
Cover fittings loose
or
seal defective or incorrectly fitted
or
burner defective?
Condensation in the air box
Check
1. Is diaphragm in air/gas manifold
fitted correctly (see installation
instructions)?
B Open air/gas manifold.
B Check diaphragm for correct
orientation, soiling and splitting.
8 716 115 748 (2009/09)
Supplied By www.heating spares.co Tel. 0161 620 6677
yes:
no:
yes:
no:
yes:
no:
or O level.
2 2
Action
go to 8
B De-commission appliance.
In case of natural gas:
B Notify gas utility.
There is flue gas in the combustion air.
B Check flue and repair or replace if necessary.
Ignition poor? go to 9
go to 9
B Adjust CO level as per installation instructions.
2
Ignition poor? go to 10
go to 10
B Replace burner and seal if necessary.
B Ensure seal is fitted in correct position.
B Open the gas valve.
B Switch ON the appliance.
B Check appliance for leaks.
Action
B Fit diaphragm as per installation instructions or
replace.
B Close air/gas manifold (see installation
instructions).
RECTIFYING FAULTS
55