Viessmann Vitodens 200, Service Instructions Manual

Page: 30 / 116

30
Troubleshooting
Diagnosis using the control unit
(cont.)
Fault message
Display System characteristics
Control
unit for
Control unit for weather-
compensated mode with
p y
Burner
fault,
d
constant
temp.
mode
standard
programming
unit
Comfortrol
programming
unit
red
AĂăĂ4 U :A:ă4 FAULT: A4 OFF Pump runs at maximum
speed
or
pump inoperative
AĂăĂ5
U :A:ă5 FAULT: A5 OFF ćć
ćć ćć FAULT: B1 OFF Constant heating
bĂăĂ2
U :b:ă2 FAULT: B2 OFF Boiler cools down
bĂăĂ3
U :b:ă3 FAULT: B3 OFF No adjustment possible
via service level
bĂăĂ6 U :b:ă6 FAULT: B6
BURNER
CONTROL
UNIT FAULTY
OFF Boiler cools down
U ĂCĂC U :C:ăC FAULT: CC
(204
*1
)
ON Burner control unit fault
1ĂăĂC
cĂ:Ă_8 FAULT: C8 OFF
The boiler does not start
ăĂăĂC cĂ:Ă_0 FAULT: C0
*1
Call up display of fault codes from the fault memory.
5692Ă485
G
B