Viessmann Vitocrossal 200 CM2C 115, Service Instructions Manual, Page: 44 / 64

44
Fault code dis-
played System characteristics Cause Measures
F F8 Flame tears off during opera-
tion. Burner gauze assembly
contaminated or faulty Clean the burner gauze assembly
with compressed air. Replace the
burner gauze assembly if it is dam-
aged.
F F8 Flame tears off during opera-
tion. Combustion characteris-
tics not ideal Adjust burner (see page 16).
F F8 Flame tears off during modu-
lation (burner output increa-
ses). Combustion characteris-
tics not ideal
Air pressure switch adjus-
ted incorrectly. Adjust burner (see page 16).
Adjust air pressure switch (see
page 50).
F F9 Fan not running; fan speed
not reached. Fan faulty; cables are faul-
ty or broken Check cables. Replace fan if re-
quired.
F F9 Status duration too long, fan
ramp-up Internal fault; fan cannot
reach its set value. Replace fan or burner control unit.
F F9 Fan speed deviation Fan faulty, cable "
a-Ö
A"
faulty or broken
Check cable. Replace cable
"
a-Ö
A" or fan if necessary.
F F9 No feedback from fan Fan faulty, external fan
power supply not connec-
ted or faulty, cable "
a-Ö A"
faulty or broken, fan
blocked (poss. by foreign
bodies)
Check cable" a-Ö A" and external
power supply. Replace cable or
fan. Remove foreign bodies.
F FA Fan runs without demand;
burner control unit in a fault
state. Fan does not reach idle
state, cable "
a-Ö
A" faulty,
fan faulty, burner control
unit faulty
Wind influence on fan; check flue
outlet and fan. Replace cable
"
a-Ö
A". Replace fan. Replace
burner control unit.
F 80 Burner control unit in a fault
state; system cooling down;
burner control unit locked out. Short circuit, boiler water
temperature sensor Check connecting cable and boiler
water temperature sensor 3A/3B
(dual sensor). Replace sensor if re-
quired.
F 81 Burner control unit in a fault
state Sensor drift, boiler water
temperature sensor Check connecting cable and boiler
water temperature sensor 3A/3B
(dual sensor). Replace sensor if re-
quired.
F 82 Burner control unit in a fault
state; system cooling down;
burner control unit locked out. Short circuit, flue gas tem-
perature sensor Check connecting cable and flue
gas temperature sensor 15A/15B
(dual sensor). Replace sensor if re-
quired.
F 83 Burner control unit in a fault
state Sensor drift, flue gas tem-
perature sensor Check connecting cable and flue
gas temperature sensor 15A/15B
(dual sensor). Replace sensor if re-
quired.
F 88 Burner control unit in a fault
state Lead break, boiler water
temperature sensor Check connecting cable and boiler
water temperature sensor 3A/3B
(dual sensor). Replace sensor if re-
quired.
F 89 Burner control unit in a fault
state Lead break, flue gas tem-
perature sensor Check connecting cable and flue
gas temperature sensor 15A/15B
(dual sensor). Replace sensor if re-
quired.
F E3 Burner control unit in a fault
state Safety equipment has re-
sponded. Check safety equipment on
STB/STB at plug
aBÖ of the
Vitotronic.
Troubleshooting
Fault codes
(cont.)
5831036
Diagnosis