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37
Rectifying faults
Error Fd
4. Is appliance’s internal air/flue chan-
nel leaking or blocked?
B Open up heat exchanger and
inspect.
B Remove silencer, flue duct and air
flow limit.
B Open trap and inspect.
Air channels dirty/clogged, seals
defective or not correctly fitted?
yes: B Repair or replace components.
B Grease seal before fitting. Make sure it is fitted in
correct position.
Rumbling noises? ↓5.
no: ↓5.
5. B Measure CO
2
levels.
CO
2
levels in flue gas at min and
max output do not match figures
specified in installation instruc-
tions.
yes: B Adjust CO
2
level as per installation instructions.
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.
Excessive burner noise, rumbling noises
Check Action
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