Technical data

7 181 465 346 GB (03.02)
Failure identification procedure
43
7.
B Press buttons and simulta-
neously.
B Select service-function 5.9.
0 is displayed.
B Set to 1 for high start-up speed.
Flue gas levels incorrect, CO level too high
Check Action
1. Does the gas supply type match the
specifications on the appliance iden-
tification plate?
yes: ↓2.
no: B Convert appliance to correct gas type.
↓2.
2. B Test gas supply pressure - OK? yes: ↓3.
no: B Decommission appliance.
B Notify gas company.
3. Problem with flue?
B Check CO
2
level in combustion
air.
Is CO
2
level above 0,2 % ?
yes: B Check flue and repair or replace if necessary.
no: ↓4.
4. Flue gas CO
2
levels measured at
min. and max. load do not match
specified levels?
B Measure CO
2
levels.
yes: B Adjust CO
2
levels.
no: ↓5.
5. Gas volumetric flow too high when
CO
2
level correctly set.
yes: B Reduce gas volumetric flow rate by means of
adjusting screw on gas valve and/or gas flow
restrictor.
B Check CO
2
adjustment.
no: ↓6.
6. B Turn off gas cock.
B Power OFF the appliance.
B Change the gas valve.
B Open the gas cock.
B Turn ON the appliance.
B Check appliance for leaks.
Excessive burner noise, rumbling noises
Check Action