69
Fault code dis-
played
System characteristics
Cause
Measures
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 76).
58
No DHW heating
Lead break, cylinder tem-
perature sensor
Check sensors (see page 76).
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.
92
No solar DHW heating
Short circuit, collector
temperature sensor
Check temperature sensor
&
on
solar control module or sensor on
the Vitosolic.
93
Control mode
Short circuit, cylinder tem-
perature sensor
Check temperature sensor at ter-
minal S3 on the Vitosolic 100.
94
No solar DHW heating
Short circuit, cylinder tem-
perature sensor
Check temperature sensor
%
on
solar control module or sensor on
the Vitosolic.
98
Control mode
Lead break, temperature
sensor
/
Check sensor
/
on solar control
module.
99
Control mode
Lead break, temperature
sensor
aÖ
Check sensor
aÖ
on solar control
module.
9A
No solar DHW heating
Lead break, collector tem-
perature sensor
Check temperature sensor
&
on
solar control module or sensor on
the Vitosolic.
9B
Control mode
Lead break, cylinder tem-
perature sensor
Check temperature sensor at ter-
minal S3 on the Vitosolic 100.
9C
No solar DHW heating
Lead break, cylinder tem-
perature sensor
Check temperature sensor
%
on
solar control module or sensor on
the Vitosolic.
9E
Control mode
No or inadequate flow rate
in collector circuit, or tem-
perature limiter has re-
sponded.
Check solar circuit pump and solar
circuit. Acknowledge fault mes-
sage.
9F
Control mode
Solar control module or
Vitosolic fault
Replace solar control module or Vi-
tosolic.
A3
Burner blocked.
Flue gas temperature sen-
sor incorrectly positioned.
Fit flue gas temperature sensor
correctly. See page 77
A4
Control mode
Max. system pressure ex-
ceeded
Check system pressure: Max.
3 bar (0.3 MPa)
Check the function and sizing of
the diaphragm expansion vessel.
Vent the heating system.
A7
Control mode as per deliv-
ered condition
Programming unit faulty
Replace the programming unit.
B0
Burner blocked
Short circuit, flue gas tem-
perature sensor
Check flue gas temperature sen-
sor.
Troubleshooting
Fault codes
(cont.)
5839829
Diagnosis