6 720 611 447 GB (03.11)
46
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 Remedy
A1 pump has run dry Check system pressure, add water and bleed
system as necessary
A7 Hot water NTC sensor defective. Check hot water NTC sensor and connecting
lead for circuit breaks/short circuits.
A8 Break in communication Check connecting lead to TR2
b1 Code plug not detected. Insert code plug correctly, test and replace if
necessary.
C1 Fan speed too low. Check fan lead and connector, and fan; replace
as necessary.
d3 Jumper 8-9 not detected. Connector not connected, link missing, under-
floor heating limiter tripped.
E2 CH flow NTC sensor defective Check CH flow NTC sensor and connecting
lead.
E9 Safety temp. limiter in CH flow has tripped. Check system pressure, check safety temp. lim-
iters, check pump operation, check fuse on pcb,
bleed appliance.
EA Flame not detected. Is gas cock turned on? Check gas supply pres-
sure, power supply, igniter electrode and lead,
ionisation sensing electrode and lead, flue duct
and CO2 level.
F0 Internal error. Check electrical connector contacts, program-
mer interface module ignition leads are not
loose; replace pcb if necessary.
F7 Flame detected even though appliance
switched off.
Check electrode assembly, dry pcb. Flue clear?
FA Flame detected after gas shut off. Check gas valve and wiring to gas valve. Clean
condensation trap and check electrode assem-
bly. Flue clear?
FC Text display not detected. Check connecting lead between Text display
and Heatronic, replace Text display if necessary
Fd Reset button pressed by mistake. Press reset button again
P1, P2,
P3, P1...
Please wait, initialisation in progress. 24 V fuse blown. Replace fuse.
Table 18
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