Operating instructions

52
Message
System characteristics Cause Measures
4C Flow sensor cooling
Break, flow temperature
sensor, cooling circuit
Check resistance (Ni 500)
at plug-in connection F14;
replace sensor if
required.
50 DHW sensor top
DHW heating is blocked. Short circuit, top cylinder
temperature sensor
Check resistance (Pt 500)
at plug-in connection F6
and terminals X6.2/X6.1;
replace sensor if
required.
54 DHW solar
No heating of the DHW
cylinder/primary store by
the solar thermal system;
solar circuit pump
remains OFF.
Cylinder temperature
sensor F6 shorted out
See Vitosolic service
instructions.
58 DHW sensor top
DHW heating is blocked. Break, cylinder tempera-
ture sensor F6
Check resistance (Pt 500)
at plug-in connection F6
and terminals X6.2/X6.1;
replace sensor if
required.
5C DHW solar
No heating of the DHW
cylinder/primary store by
the solar thermal system;
solar circuit pump
remains OFF.
Lead break, cylinder
temperature sensor
See Vitosolic service
instructions.
60 Buffer cylinder sensor
Buffer cylinder is heated
once every hour. Heating
stops according to set
value of the return tem-
perature sensor.
Short circuit, buffer cylin-
der temperature sensor
Check resistance (Pt 500)
at plug-in connection F4
and terminals X5.6/X5.7;
replace sensor if
required.
Troubleshooting
Messages
(cont.)
5441 603 GB