Viessmann VITOTRONIC 200 Installation And Service Instructions Manual page 74

Troubleshooting
Fault Display Vitotronic 300-K
Fault codes
Displayed fault code
DA
DB
DC
DD
DE
DF
01 to 97
98 and 99
74
(continued)
System characteristics
Control mode without room
influence.
Control mode without room
influence.
Control mode without room
influence.
Control mode without room
influence.
Control mode without room
influence.
Control mode without room
influence.
Control mode
Control mode
Vitotronic 200 and 300-K Installation and Service
Cause
Short circuit, room
temperature sensor, heating
circuit without mixing valve
A1 (heating circuit 1)
Short circuit, room
temperature sensor, heating
circuit with mixing valve M2
(heating circuit 2)
Short circuit, room
temperature sensor, heating
circuit with mixing valve M3
(heating circuit 3)
Lead break, room temperature
sensor, heating circuit without
mixing valve A1
(heating circuit 1)
Lead break, room temperature
sensor, heating circuit with
mixing valve M2 (heating
circuit 2)
Lead break, room temperature
sensor, heating circuit with
mixing valve M3 (heating
circuit 3)
A fault has occurred at a
participant, e.g. 12
(Vitotronic 200-H)
or
no connection to the
participant
Fault message active at
Vitocom 200/300
or
fault at Vitocom 200/300
or Vitogate 200
or
no connection to Vitocom
200/300/Vitogate 200
LON participants fault messages
Requirement: The control unit must be programmed
as fault manager (code "79:1").
Measures
Check the room temperature
sensor (see page 87).
Check the room temperature
sensor (see page 87).
Check the room temperature
sensor (see page 87).
Check room temperature sensor
(see page 87) and adjustment
of the remote control (see
separate installation and service
instructions).
Check room temperature sensor
(see page 87) and adjustment
of the remote control (see
separate installation and service
instructions).
Check room temperature sensor
(see page 87) and adjustment
of the remote control (see
separate installation and service
instructions).
Download fault code to
participant
Installation and Service
Instructions of the
appropriate control unit
Check coding
Check connecting LON cable
Updating the LON participant
list
Carrying out a participant check
Check the external connections
at Vitocom / Vitogate 200
Installation and
Service Instructions
Vitocom
Check coding
Check connecting LON cable
Updating the LON participant
list
Carrying out a participant check