Viessmann VITOTRONIC 100 GC1B Installation And Service Instructions Manual page 87

Vitotronic 100, GC1B Installation and Service
Fault Display
(continued)
Fault Codes
Displayed System Characteristics
Fault Code
70 Shunt pump constantly "ON".
With primary store system:
Mixing valve primary circuit
"Close";
78 Shunt pump constantly "ON".
With primary store system:
Mixing valve primary circuit
"Close";
90 Control mode.
91 Control mode.
92 No solar DHW heating.
93 Control mode.
94 No solar DHW heating.
98 Control mode.
99 Control mode.
no DHW heating.
no DHW heating.
Cause
Short circuit, temperature
sensor aJB.
Lead break, temperature
sensor aJB.
Short circuit,
temperature sensor /,
Connection at the solar
control module.
Short circuit,
temperature sensor aÖ,
Connection at the solar
control module.
Short circuit, collector
temperature sensor,
Connection of
temperature sensor &
at solar control module.
Short circuit,
temperature sensor,
connection at S3 of the
Vitosolic.
Short circuit, DHW
tank temperature
sensor, connection of
temperature sensor %
at solar control module.
Lead break, temperature
sensor /, connection
to the solar control
module.
Lead break, temperature
sensor aÖ, connection
to the solar control
module.
Troubleshooting
Measures
Check temperature sensor (see page 116).
Check temperature sensor (see page 116).
Without temperature sensor:
Set code "4b:0" in group 1
"General".
Check temperature sensor /.
Solar control module
installation and service
instructions
Check temperature sensor aÖ.
Solar control module
installation and service
instructions
Check solar control unit sensor.
Solar control unit installation
and service instructions
Check solar control unit sensor.
Solar control unit installation
and service instructions
Check solar control unit sensor.
Solar control unit installation
and service instructions
Check temperature sensor /.
Solar control module
installation and service
instructions
Check temperature sensor aÖ.
Solar control module
installation and service
instructions
87