Viessmann VITOTRONIC 300 Installation And Service Instructions Manual page 58

Troubleshooting, Vitotronic 300-K
Fault Codes
(continued)
Displayed System characteristics
fault code
9B Control mode.
9C No solar DHW heating.
9E Control mode.
9F Control mode.
AB Control mode, DHW
tank may be cold.
B1 Control mode.
B5 Control mode.
B6 Constant mode.
BA Mixing valve "Closed".
BC Control mode without
remote control.
BD Control mode without
remote control.
BE Control mode without
remote control.
BF Control mode.
No communication via
LON.
58
Cause
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 for which there is no fault
code in the Vitotronic.
Primary store system configuration
error:
Code "55:3" has been selected in the
"DHW" group, but plug aJB is not
plugged in and/or codes "4C:1" and
"4E:2" in the "General" group have
not been set.
Communication fault, programming
unit
Internal fault
Invalid hardware recognized
Communication fault, PCB, extension
for heating circuits 2 and 3 with
mixing valve
Communication fault, remote control
Vitotrol system circuit A1 (heating
circuit 1)
Communication fault, remote control
Vitotrol, heating circuit with mixing
valve M2 (heating circuit 2)
Communication fault, remote control
Vitotrol with mixing valve M3 (heating
circuit 3)
Incorrect LON communication module
Vitotronic 300, GW5B & MW1B Installation and Service
Measures
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 codes.
Check connections and replace the
programming unit if required.
Check PCB is plugged in correctly.
Check coding address
"92" in the "General" group; "92:187"
must be set.
Note: Code "8A:176" must be selected
so that coding address "92" is
displayed.
Check that the PCB and ribbon cable are
plugged in, and replace PCB if required.
Check connections, lead (see separate
installation and service instructions) and
coding address "A0" in the "Heating
circuit..." group.
Check connections, lead (see separate
installation and service instructions) and
coding address "A0" in the "Heating
circuit..." group.
Check connections, lead (see separate
installation and service instructions) and
coding address "A0" in the "Heating
circuit..." group.
Replace LON communication module.