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5790 733 - 07
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Boiler System Fault Codes
(continued)
Troubleshooting
Displayed
fault code
System characteristics
Cause
Measures
83
If a fault occurs 3 x in 15 min.,
fault is displayed. Burner control
unit goes into a fault state.
Sensor drift, flue gas temperature
sensor (A or B), burner control unit
Check connection cable and
sensors (A and B), replace
sensors if required.
88
Burner control unit in a fault state Lead break, boiler water
temperature sensor, burner
control unit
Check connection cable and
dual sensor; replace sensor if
required.
89
Burner control unit in a fault state Lead break, flue gas temperature
sensor (A or B), burner control
unit
Check connection cable and
sensors (A and B), replace sensor
if required.
90
Control mode
Short circuit, temperature sensor
/
connection at solar control
module, type SM1.
Check temperature sensor
/
(see separate installation and
service instructions).
91
Control mode
Short circuit, temperature sensor
aÖ
, connection at solar control
module, type SM1.
Check temperature sensor
aÖ
(see separate installation and
service instructions).
92
No solar DHW heating.
Short circuit, collector
temperature sensor, connection
of temperature sensor
&
at solar
control module, type SM1 or
sensor at S1 of the Vitosolic.
Check sensor at the solar control
unit (see separate installation and
service instructions).
93
Control mode.
Short circuit, temperature sensor,
connection at S3 of the Vitosolic.
Check sensor at the solar control
unit (see separate installation and
service instructions).
94
No solar DHW heating.
Short circuit, DHW tank
temperature sensor, connection
of temperature sensor
%
at solar
control module, type SM1 or
sensor at S2 of the Vitosolic.
Check sensor at the solar control
unit (see separate installation and
service instructions).
98
Control mode
Lead break, temperature sensor
/
, connection at solar control
module, type SM1.
Check temperature sensor
/
(see separate installation and
service instructions).
Check coding address “20” in
the “Solar” group.
99
Control mode
Lead break, temperature sensor
aÖ
, connection at solar control
module, type SM1.
Check temperature sensor
aÖ
(see separate installation and
service instructions).
Check coding address “20” in
the “Solar” group.
9a
No solar DHW heating.
Lead break, collector temperature
sensor, connection of
temperature sensor & at solar
control module, type SM1 or
sensor at S1 of the Vitosolic.
Check sensor at the solar control
unit (see separate installation and
service instructions).
