6 720 611 137 GB (03.02)
40
Appendix
9
Appendix
9.1
Fault Codes
More detailed fault finding procedures are described in the Service booklet for the Engineer number 7 181 465 346.
Display
code
Description
Remedy
A8
Break in communication
Check connecting lead to programmer
AC
Module not detected.
Check connecting lead between TA211E/
TR212E and Heatronic
b1
Keyed plug not detected.
Insert keyed 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 external 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 CO
2
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?
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 16
