Viessmann Vitodens 200, Service Instructions Manual

Page: 36 / 116

36
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
U Ă1Ă4 U :1:ă4 FAULT: 14
(021
*1
)
ON Burner control unit fault
U Ă0ĂC U :0:ăC FAULT: 0C
(012
*1
)
ON Burner control unit fault
U Ă0Ăd U :0:ăd FAULT: 0D
(013
*1
)
ON Burner control unit fault
U Ă2Ă5 U :2:ă5 FAULT: 25 OFF Boiler runs with a high
boiler water temperature
U Ă2Ă6 U :2:ă6 FAULT: 26 OFF Boiler runs with constant
modulation
U Ă3Ă5 U :3:ă5 FAULT: 35 OFF Boiler does not start
1ĂăĂ5 5Ă:Ă_1 FAULT: 51 OFF
No DHW heating
ăĂăĂ5 5Ă:Ă_9 FAULT: 59
*1
Call up display of fault codes from the fault memory.
5692Ă485
G
B