Fault Codes - Viessmann Vitocrossal 300 Service Instructions For Contractors

Troubleshooting

Fault codes

Displayed System characteris-
fault code tics
10 Controls as if outside
temperature was
0 °C
18 Controls as if outside
temperature was
0 °C
30 Burner blocked
38 Burner blocked
40 Mixer closes
44 Mixer closes
48 Mixer closes
4C Mixer closes
50 No DHW heating
58 No DHW heating
90 Control mode
91 Control mode
96
Cause
Short circuit, out-
side temperature
sensor
Lead break, out-
side temperature
sensor
Short circuit, boiler
water temperature
sensor
Lead break, boiler
water temperature
sensor
Short circuit, flow
temperature sen-
sor, heating circuit
2 (with mixer)
Short circuit, flow
temperature sen-
sor, heating circuit
3 (with mixer)
Lead break, flow
temperature sen-
sor, heating circuit
2 (with mixer)
Lead break, flow
temperature sen-
sor, heating circuit
3 (with mixer)
Short circuit, cylin-
der temperature
sensor
Lead break, cylin-
der temperature
sensor
Short circuit, tem-
perature sensor /
Short circuit, tem-
perature sensor
aÖ
Measures
Check outside tempera-
ture sensor (see
page 105)
Check outside tempera-
ture sensor (see
page 105)
Check boiler water tem-
perature sensor (see
page 106)
Check boiler water tem-
perature sensor (see
page 106)
Check flow temperature
sensor
Check flow temperature
sensor
Check flow temperature
sensor
Check flow temperature
sensor
Check sensors (see
page 106)
Check sensors (see
page 106)
Check sensor / on solar
control module
Check sensor aÖ on solar
control module