Troubleshooting Diagnosis; Faults Displayed On The Display And Programming Unit (Fault Codes) - Viessmann Vitocrossal 300 Service Instructions Manual

Troubleshooting
Diagnosis

Faults displayed on the display and programming unit (fault codes)

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