32
Faults displayed on the display and programming unit (fault codes)
Message codes
Message code
System characteristics
Cause
Measures
A
Burner does not start
Gas supply pressure too
low; gas pressure switch
switches off
Check gas flow pressure; check
gas pressure switch.
A
Burner does not start.
Lack of gas
Notify your gas supply utility.
c00
Burner does not start.
New parameter memory stick
Data transfer from new
parameter memory stick
via password
Enter password (hexadecimal
number between 0 and 255 or 00
and FF). See installation instruc-
tions for burner components.
F
Burner is in a fault state
See fault code
See fault code, steps to take
F1 (flashing)
Burner does not start
Parameter memory stick
not plugged in correctly or
faulty
Check parameter memory stick or
replace. See installation instruc-
tions for burner components.
F2 (flashing)
Burner does not start
Connected display is inva-
lid
Use current display
9
On hold program
Lack of gas at the VPS
gas pressure switch or
safety chain not closed.
Select fault in the fault
memory. The burner auto-
matically starts up again in
accordance with the time
program.
Burner starts automatical-
ly after 2 min, after 5 min
and then after 1 h.
Reset by holding down the reset
button until "9" flashes.
General process errors
Fault code
*1
Shown on
display
System characteristics
Cause of fault
Measure
F AA
F AA
Fan pressure is produced
during the air pressure
switch idle state check.
Wind influence on fan
Check the flue draught
(chimney).
F AA
F AA
Air pressure switch con-
tact is not in the idle state
Air pressure switch faulty Replace air pressure
switch.
F Ab
F Ab
Air pressure switch not
reporting any air pres-
sure. Fan not running.
Air pressure switch faul-
ty, incorrectly connected
or incorrectly set
Replace air pressure
switch, connect or set cor-
rectly.
F Ab
F Ab
Air pressure switch
switches off during opera-
tion
Flue gas back pressure,
condensate backed up
Remove flue gas back
pressure, check for con-
densate backed up, and
reset the burner control
unit.
F Ab
F Ab
Fan not running.
Fan faulty; cables are
faulty or broken
Check cables and replace
the fan if required.
F Ad
A
Gas pressure switch re-
ports no gas pressure.
Gas shut-off valve
closed, gas pressure
switch faulty
Open the gas shut-off
valve and check the gas
flow pressure; clean the
gas filter if required.
*1
All fault codes are saved to the fault memory and the last 10 can be called up.
Troubleshooting
Diagnosis
5783 337 GB
Diagnosis