Faults That Are Not Displayed; Excessive Burner Noise, Rumbling Noises; Appliance Faults - Worcester ZSBR 7-28 ICS1 Service Booklet

Rectifying faults
4.5

Faults that are not displayed

4.5.1

Appliance faults

Boiler indicates P1, P2, P3 at start-up and then restarts with P1..
Check
1. Fuse T 1.6 A (312) defective.
2. The PCB control board is damaged.

Excessive burner noise, rumbling noises

Check
1. Does the gas supply type match the
specifications on the appliance iden-
tification plate?
B Test gas supply pressure - OK?
2.
3. Problem with flue?
B Check CO
level in combustion
2
air.
> 0,2 % CO
2
4. B Remove silencer, flue pipe and
mixer unit.
Is internal flue pipe/silencer dirty or
clogged or are seals defective or
incorrectly fitted?
5. Flue gas CO levels measured at
2
min. and max. load do not match
1)
specified levels
B Measure CO
1) See installation instructions
36
1)
?
?
.
levels.
2
Action
B Turn ON the appliance.
yes:
B Change the fuse.
B Power OFF the appliance.
Start sequence not completed? ↓2.
↓2.
no:
B Change PCB control board.
Action
↓2.
yes:
B Convert appliance to correct gas type
no:
↓3.
yes:
B Decommission appliance.
no:
B Notify gas company.
B Check flue and repair or replace if necessary.
yes:
↓4.
no:
yes: B Repair or replace components.
B Grease seal before fitting,
B Make sure it is fitted in correct position.
↓5.
no:
B Adjust CO
yes:
B Power OFF the appliance.
no:
B Change the gas valve.
B Turn ON the appliance.
levels.
2
7 181 465 347 (01.07)
1)
.