Viessmann VITOTRONIC 300 Installation And Service Instructions Manual page 57

Vitotronic 300, GW5B & MW1B Installation and Service
Fault Codes
(continued)
Displayed System characteristics
fault code
60 Boiler with maximum
temperature, no output
reduction, mixing valve return
temperature control "Open".
68 Boiler with maximum
temperature, no output
reduction, mixing valve return
temperature control "Open".
70 Shunt pump constantly "ON".
With primary store system:
3-way mixing valve "Closed";
no DHW heating.
78 Shunt pump constantly "ON".
With primary store system:
3-way mixing valve "Closed";
no DHW heating.
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
9A No solar DHW heating.
Cause
Short circuit, temperature sensor
aJA
Lead break, temperature sensor
aJA
Short circuit, temperature sensor
aJB
Lead break, temperature sensor
aJB
Short circuit, temperature sensor
/, connection to solar control
module.
Short circuit, temperature sensor
aÖ, connection to solar control
module.
Short circuit, collector
temperature sensor, connection
of temperature sensor & at solar
control module or sensor at S1 of
the Vitosolic.
Short circuit, temperature sensor,
connection at S3 of the Vitosolic
Short circuit, DHW tank
temperature sensor, connection
of temperature sensor % at solar
control module or sensor at S2 of
the Vitosolic.
Lead break, temperature sensor
/, connection to solar control
module.
Lead break, temperature sensor
aÖ, connection to solar control
module.
Lead break, collector temperature
sensor, connection of temperature
sensor & at solar control module
or sensor at S1 of the Vitosolic.
Troubleshooting, Vitotronic 300-K
Measures
Check temperature sensor
(see page 110).
Check temperature sensor
(see page 110).
Without temperature sensor:
Set code "4A:0" in the
"General" group.
Check temperature sensor
(see page 110).
Check temperature sensor
(see page 110).
Without temperature sensor:
Set code "4b:0" in the
"General" group.
Check temperature sensor /
(see separate installation and
service instructions).
Check temperature sensor aÖ
(see separate installation and
service instructions).
Check sensor at the solar control
unit (see separate installation and
service instructions).
Check sensor at the solar control
unit (see separate installation and
service instructions).
Check sensor at the solar control
unit (see separate installation and
service instructions).
Check temperature sensor /
(see separate installation and
service instructions).
Set coding address "20" in the
"Solar" group.
Check temperature sensor aÖ (see
separate installation and service
instructions).
Set coding address "20" in the
"Solar" group.
Check sensor at the solar control
unit (see separate installation and
service instructions).
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