Worcester ZWBR 7-30 R 30 HE PLUS COMBI Service Booklet page 37

Excessive burner noise, rumbling noises
Check
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?
B Measure CO
5. levels.
2
CO levels in flue gas at min and
2
max output do not match figures
specified in installation instruc-
tions.
7 181 465 347 (05.01)
Supplied By www.heating spares.co Tel. 0161 620 6677
Action
B Repair or replace components.
yes:
B Grease seal before fitting. Make sure it is fitted in
correct position.
Rumbling noises? ↓5.
↓5.
no:
B Adjust CO
yes:
B Power OFF the appliance.
no:
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.
Rectifying faults
level as per installation instructions.
2
Error Fd
37