Operation
VITOBLOC 200 EM-530/660
version
SCR
Operating instructions
27
58
4
1
4
3
5
GB
5.8.5 Fault messages on the SCR controller
The display shows the fault message in plain text
Pos. Message text
Possible cause of fault
Measures to rectify the fault
1
CAN modules missing
●
Fault, CAN bus is missing at
least one subscriber.
●
CAN bus cable faulty.
•
Replace CAN bus cable.
2
SCR system warning
●
Internal warning on the SCR
controller.
●
Contact Viessmann Service
3
Fault
●
Internal fault of the SCR
controller. Faults can be
viewed under DM1 message.
•
Identify fault more accurately.
4
Tank level too low
●
Top up tank
•
Check top-up pump and
replace if necessary
•
Check anti-siphon valve and
replace if necessary.
•
Top up AdBlue
TM
supply tank
•
Check AdBlue
TM
lines for
blockages or leaks and
replace if necessary.
5
UDS nozzle air pressure too low
●
System has not yet adjusted
pressure.
●
Compressed air supply
insufficient (e.g. compressor
faulty or not switched on)
●
Supply line faulty.
●
Restart system
●
Ensuring a compressed air
supply
●
If necessary, contact
Viessmann Service
6
UDS nozzle air pressure too high
Nozzle is blocked.
●
UDS nozzle air pressure too
high
●
Nozzle is blocked.
●
Replace nozzle
7
UDS AdBlue
TM
temperature too
low
●
Temperature in intermediate
tank is too low.
●
Observe operating conditions
(see technical description and
installation instructions)
8
UDS AdBlue
TM
temperature too
high
●
Temperature in intermediate
tank is too high.
●
Observe operating conditions
(see technical description and
installation instructions)
9
UDS AdBlue
TM
pressure too low
●
AdBlue
TM
line has not been
filled.
10
UDS AdBlue
TM
pressure too high
●
AdBlue
TM
line or nozzle
blocked.
●
Check AdBlue
TM
lines and
nozzle and replace if
necessary.
