Viessmann Vitoligno 300-P Service Instructions For Contractors page 79

Fault display
(cont.)
Fault code System characteris-
on the dis- tics
play
48 Mixer closes
50 No cylinder heating
58 No cylinder heating
60 No buffer cylinder
heating
62 Buffer cylinder heat-
ing acc. to the buffer
temperature sensor,
top
68 No buffer cylinder
heating
6A Buffer cylinder heat-
ing acc. to the buffer
temperature sensor,
top
92 Solar circuit pump
switched OFF; no cyl-
inder heating through
the solar thermal sys-
tem.
Collector frost protec-
tion function starts, if
enabled and if
required
Cause
Break, flow tem-
perature sensor,
heating circuit 2
Short circuit, cylin-
der temperature
sensor
Break, cylinder
temperature sen-
sor
Break, buffer tem-
perature sensor
top
Short circuit, buffer
cylinder tempera-
ture sensor below
Break, buffer tem-
perature sensor,
top
Break, buffer cylin-
der temperature
sensor below
Collector tempera-
ture sensor shor-
ted out.
External Vitosolic
solar control unit:
Connection to S1
Troubleshooting
Measures
Check the flow tempera-
ture sensor (see
page 88)
Check the cylinder tem-
perature sensor (see
page 85)
Check the cylinder tem-
perature sensor (see
page 85)
Check buffer temperature
sensor (see page 85)
Check buffer temperature
sensor (see page 85)
Check buffer temperature
sensor (see page 85)
Check buffer temperature
sensor (see page 85)
Check collector tempera-
ture sensor (see
page 85)
79