Viessmann VITOLIGNO 300-P Service Instructions Manual page 89

Fault display
(cont.)
Displayed System characteris-
fault code tics
48 Mixer closes
50 No cylinder heating
58 No cylinder heating
60 No buffer cylinder
heating
62 Buffer cylinder heat-
ing acc. to buffer tem-
perature sensor, top
68 No buffer cylinder
heating
6A Buffer cylinder heat-
ing acc. to buffer tem-
perature sensor, top
92 Solar circuit pump
switched off; no cylin-
der heating through
the solar thermal sys-
tem.
Collector frost protec-
tion function starts, if
enabled and if
required
93 Solar circuit pump
switched off; no cylin-
der heating through
the solar thermal sys-
tem.
Collector frost protec-
tion function starts, if
enabled and if
required
Cause
Lead break, flow
temperature sen-
sor, heating cir-
cuit 2
Short circuit, cylin-
der temperature
sensor
Lead break, cylin-
der temperature
sensor
Short circuit, buffer
temperature sen-
sor, top
Short circuit, buffer
temperature sen-
sor, bottom
Lead break, buffer
temperature sen-
sor, top
Lead break, buffer
temperature sen-
sor, bottom
Short circuit, col-
lector temperature
sensor
External Vitosolic
solar control unit:
Connection to S1
Short circuit, tem-
perature sensor
External Vitosolic
solar control unit:
Connection to S3
Troubleshooting
Measures
Check flow temperature
sensor (see page 99)
Check the cylinder tem-
perature sensor (see
page 96)
Check the cylinder tem-
perature sensor (see
page 96)
Check buffer temperature
sensor (see page 96)
Check buffer temperature
sensor (see page 96)
Check buffer temperature
sensor (see page 96)
Check buffer temperature
sensor (see page 96)
Check collector tempera-
ture sensor (see
page 96)
Check temperature sen-
sor (see page 96)
89