Viessmann VITOTRONIC 200 Installation And Service Instructions Manual page 52

Troubleshooting
Fault Codes
(continued)
Fault codes
Displayed fault code
d3
d5
d6
d7
d8
dA
db
dC
dd
dE
dF
52
System characteristics
Control mode.
Boiler ramps up to 140°F
(60°C).
Control mode.
Control mode.
Control mode.
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.
Vitotronic 200, HO1B and 300-K, MW2C Installation/Service
Cause
Communication error EA1
extension
The boiler does not "log in"
at the cascade control unit.
Input DE1 at EA1 extension
reports a fault
Input DE2 at EA1 extension
reports a fault
Input DE3 at EA1 extension
reports a fault
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)
Note: If participant faults occur, "Participant fault ..." is
displayed.
Measures
Check connections
(see page 106).
Without extension EA1:
Set code "5b:0" in the
"General" group.
Check communication via
participant check, leads/cables
to the Vitotronic 200 and
codes.
Remove fault at appliance
concerned.
Remove fault at appliance
concerned.
Remove fault at appliance
concerned.
Check the room temperature
sensor (see page 105).
Check the room temperature
sensor (see page 105).
Check the room temperature
sensor (see page 105).
Check room temperature sensor
(see page 105) and adjustment
of the remote control (see
separate installation and service
instructions).
Check room temperature sensor
(see page 105) and adjustment
of the remote control (see
separate installation and service
instructions).
Check room temperature sensor
(see page 105) and adjustment
of the remote control (see
separate installation and service
instructions).