14
General process errors
Fault
code
*1
Display System charac-
teristics
Cause Measures
F AA F AA Fan pressure de-
velops during the
air pressure switch
idle state check
Wind influence on
fan
Check flue outlet
(chimney)
F AA F AA Air pressure
switch contact is
not in the idle
state
Air pressure
switch faulty
Replace air pres-
sure switch
F Ab F Ab Air pressure
switch shows no
air pressure, fan
not running
Air pressure
switch is faulty, in-
correctly connec-
ted or incorrectly
set
Replace air pres-
sure switch, con-
nect correctly or
adjust setting
F Ab F Ab Air pressure
switch switches off
during operation
Flue gas back
pressure, conden-
sate banked up
Remove flue gas
back pressure,
check for banked
up condensate, re-
set burner control
unit
F Ab F Ab Fan not running Fan faulty; cables
are faulty or bro-
ken
Check cables; re-
place fan if re-
quired
F Ad A Gas pressure
switch reports no
gas pressure
Gas shut-off valve
closed, gas pres-
sure switch faulty
Open gas shut-off
valve, check gas
flow pressure,
clean gas filter if re-
quired
F AE F AE Burner control unit
in fault state
Valve 1 leaking Replace the gas
train
F AF F AF Burner control unit
in fault state
Valve 2 leaking Replace the gas
train
F A0 and
F A1
F A0 and
F A1
Status duration
too long, fan ramp-
up
Internal fault; fan
cannot reach its
set value
Replace burner
control unit or fan
*1
All fault codes are saved to the fault memory and the last 10 can be called up.
Diagnosis
Diagnosis
(cont.)
5782 991 GB
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