Loose Or Broken Contact On Heat Store Ntc Sensor; Text Display Fails To Respond, No Display Or Display Incorrect - Worcester ZSBR 7-28 ICS1 Service Booklet

Ignition too harsh, ignition poor
Check
B Test gas supply pressure
7.
8. Problem with flue?
B Check CO
level in combustion
2
air.
> 0,2 % CO
2
9. Flue gas CO levels measured at
2
min. and max. load do not match
specified levels.
B Measure CO
2
10. Burner not correctly fitted or defec-
tive?
B Remove burner.
Cover fixings not tight
or
seal defective or not correctly fitted
or
burner defective.
1) See installation instructions

Loose or broken contact on heat store NTC sensor

Check
Heat store NTC sensor lead is not fit-
ted as described in the installation
instructions (i.e. the cable does not
pass through the cable grip in the
switchbox).

Text display fails to respond, no display or display incorrect

Check
Ignition lead is not fitted as specified
in installation instructions (i.e. the
lead should be routed through the
clip on the underside of the air box).
7 181 465 347 (01.07)
1)
- OK?. yes:
no:
yes:
?
no:
yes:
no:
levels.
Action
↓8.
B Decommission appliance.
B Notify gas company.
B Check flue and repair or replace if necessary.
Ignition poor? ↓8.
↓9.
B Adjust CO
levels.
2
↓9.
B Replace burner and seal if necessary
B Ensure seal is fitted in correct position.
Action
B Record condition of appliance as found in custo-
mer service record.
B Route cable as specified in installation instruc-
tions.
Action
B Route cable as specified in installation instruc-
tions.
Rectifying faults
39