Viessmann VITOTRONIC 200 Installation And Service Instructions Manual page 50

Troubleshooting
Fault Codes
(continued)
Fault codes
Displayed fault code
94
98
99
9A
9b
9C
9E
9F
Ab
b1
50
System characteristics
No solar DHW heating.
Control mode.
Control mode.
No solar DHW heating.
Control mode.
No solar DHW heating.
Control mode.
Control mode.
Control operation, DHW
tank may be cold.
Control mode.
Vitotronic 200, HO1B and 300-K, MW2C Installation/Service
Cause
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,
temperature sensor & at solar
control module or sensor at S1
of the Vitosolic.
Lead break, temperature
sensor, connection at S3 of the
Vitosolic.
Lead break, DHW tank
temperature sensor, connection
of temperature sensor % at
solar control module or sensor
at S2 of the Vitosolic.
No flow rate in solar circuit
or flow rate too low, or
temperature limiter has
responded.
Solar control module
or Vitosolic faulty.
Displayed if a fault occurs at
these devices that has no fault
code in the Vitotronic.
Tank loading system
configuration fault:
Code "55:3" has been set in
the "DHW" group, but plug
aJB is not plugged in and/or
Codes "4c:1" and "4e:2" in the
"General " group is not set.
Communication error,
programming unit
Measures
Check sensor at the solar
control unit (see separate
installation and service
instructions).
Check temperature sensor /
(see separate installation and
service instructions).
Check coding address "20"
in "Solar" group.
Check temperature sensor aÖ
(see separate installation and
service instructions).
Check coding address "20"
in "Solar" group.
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 solar circuit.
Acknowledge fault message
(see separate installation and
service instructions).
Check solar control unit (see
separate installation and service
instructions).
Insert plug aJB and check
coding.
Check connections and replace
the programming unit if
required.