Ac Configuration Fault, Return Temperature Control - Viessmann VITOTRONIC 300 Installation And Service Instructions Manual

Fault messages
(cont.)
Cause
Configuration fault, cylinder loading system: Parameter
"00:3" in the "DHW" group is set, but plug
plugged in and/or parameter "53:1" in the "General"
group and "55:2" in the "General" group are not set.

AC Configuration fault, return temperature control

Control mode
Cause
Configuration fault, return temperature control: Parame-
ter "0C:1" in the "Boiler" group is set, but plug
not plugged in and/or parameter "55:1" in the "Gener-
al" group is not set.
AD Configuration fault, butterfly valve
Control mode
Cause
Configuration fault, butterfly valve: Parameter "0C:2",
"0C:3" or "0C:4" in the "Boiler" group is set and pa-
rameter "55:1" in the "General" group is set.
B0 Short circuit, flue gas temperature sensor
Control mode
Cause
Short circuit, flue gas temperature sensor
B1 Communication fault, programming unit
Control mode
Cause
Communication fault, programming unit
B5 EEPROM error
Control mode
Cause
Internal fault
B6 Invalid application
Continuous operation
Measure
Insert plug
is not
aJB
Measure
Insert plug
is
aJA
Measure
With butterfly valve:
■
Set parameter "55:0" in the "General" group.
Without butterfly valve:
■
Set parameter "0C:1" in the "Boiler" group.
Measure
Check the flue gas temperature sensor: See chapter
"Checking temperature sensors"
Measure
Check connections; replace programming unit if neces-
sary.
Measure
Replace the low voltage PCB.
and check parameters.
aJB
and check parameters.
aJA
Troubleshooting
125