Viessmann Vitocrossal 100 CI1, Service Instructions For Contractors

Page: 71 / 140

71
Fault code dis-
played System characteristics Cause Measures
FE Burner blocked or in a fault
state Coding card or main PCB
faulty, or incorrect coding
card Press reset button R . If fault per-
sists, check the coding card and
replace coding card or control unit
if necessary.
FF Burner blocked or in a fault
state Internal fault or reset but-
ton
R blocked.
Restart the appliance. Replace the
control unit if the appliance will not
restart.
10 Regulates as if the outside
temperature were 0 °C. Short circuit, outside tem-
perature sensor Check outside temperature sensor
(see page 77).
18 Regulates as if the outside
temperature were 0 °C. Lead break, outside tem-
perature sensor Check outside temperature sensor
(see page 77).
19 Regulates as if the outside
temperature were 0 °C. Communication interrup-
tion, wireless outside tem-
perature sensor Check wireless connection (place
wireless outside temperature sen-
sor close to the wireless base sta-
tion). Forget outside temperature
sensor, then pair again.
Wireless base station instal-
lation and service instruc-
tions
Replace wireless outside tempera-
ture sensor.
20 Regulates without flow tem-
perature sensor (low loss
header) Short circuit, system flow
temperature sensor Check the low loss header sensor
28 Regulates without flow tem-
perature sensor (low loss
header) Lead break, system flow
temperature sensor Check the low loss header sensor.
If no low loss header sensor is
connected, set code 52:0.
30 Burner blocked Short circuit, boiler water
temperature sensor Check boiler water temperature
sensor (see page 78)
38 Burner blocked Lead break, boiler water
temperature sensor Check boiler water temperature
sensor (see page 78)
40 Mixer is being closed. Short circuit, flow temper-
ature sensor, heating cir-
cuit 2 (with mixer) Check flow temperature sensor.
44 Mixer is being closed. Short circuit, flow temper-
ature sensor, heating cir-
cuit 3 (with mixer) Check flow temperature sensor.
48 Mixer is being closed. Lead break, flow tempera-
ture sensor, heating circuit
2 (with mixer) Check flow temperature sensor.
4C Mixer is being closed. Lead break, flow tempera-
ture sensor, heating circuit
3 (with mixer) Check flow temperature sensor.
50 No DHW heating Short circuit, cylinder tem-
perature sensor Check sensors (see page 78).
58 No DHW heating Lead break, cylinder tem-
perature sensor Check sensors (see page 78).
90 Control mode Short circuit, temperature
sensor
/
Check sensor
/
on solar control
module.
91 Control mode Short circuit, temperature
sensor
aÖ
Check sensor aÖ on solar control
module.
Troubleshooting
Fault codes
(cont.)
5792 925 GB
Diagnosis