Appendix; 10.1 Fault Codes - Worcester ZWBR 7-28 HE plus Installation And Servicing Instructions

Appendix

10 Appendix

10.1 Fault Codes

More detailed fault finding procedures are described in the Service Booklet for the Engineer number 7 181 465 347.
Display
code Description
pump has run dry
A1
A7 Hot water NTC sensor defective.
A8 Break in communication
Keyed plug not detected.
b1
C1 Fan speed too low.
Jumper 8-9 not detected.
d3
CH flow NTC sensor defective
E2
E9 Safety temp. limiter in CH flow has tripped.
Flame not detected.
EA
Internal error.
F0
Flame detected even though appliance switched off.
F7
FA Flame detected after gas shut off.
Textdisplay not detected.
FC
Fd Reset button pressed by mistake.
P1, P2, P3, Please wait, initialisation in progress.
P1...
Table 18
46
Remedy
Check system pressure, add water and bleed system
as necessary
Check hot water NTC sensor and connecting lead for
circuit breaks/short circuits.
Check connecting lead to programmer
Insert keyed plug correctly, test and replace if neces-
sary.
Check fan lead and connector, and fan; replace as
necessary.
Connector not connected, link missing, underfloor
heating limiter tripped.
Check CH flow NTC sensor and connecting lead.
Check system pressure, check safety temp. limiters,
check pump operation, check fuse on pcb, bleed
appliance.
Is gas cock turned on? Check gas supply pressure,
power supply, igniter electrode and lead, ionisation
sensing electrode and lead, flue duct and CO2 level.
Check electrical connector contacts, programmer
interface module ignition leads and bus module are
not loose; replace pcb or bus module if necessary.
Check electrode assembly, dry pcb. Flue clear?
Check gas valve and wiring to gas valve. Clean con-
densation trap and check electrode assembly. Flue
clear?
Check connecting lead between Textdsiplay and
Heatronic , replace Textdisplay if necessary
Press reset button again
24 V fuse blown. Replace fuse.
6 720 610 597 GB (01.07)