Fault Codes - Viessmann VITOTRONIC 300 Installation And Service Instructions Manual

Vitotronic 300, GW5B & MW1B Installation and Service

Fault Codes

Displayed fault System characteristics
code
0F Control mode.
30 The burner is started and stopped via a
temperature controller.
38 The burner is started and stopped via a
temperature controller.
60 Boiler with maximum temperature, no
output reduction, mixing valve return
temperature control "Open".
68 Boiler with maximum temperature, no
output reduction, mixing valve return
temperature control "Open".
70 Shunt pump constantly "ON".
78 Shunt pump constantly "ON".
A0 Boiler cools down.
A1 Boiler cools down.
A2 Boiler cools down.
A3 Boiler cools down.
AA Control mode.
AC Control mode.
Troubleshooting, Vitotronic 300, GW5B
Cause
Service "0F" is only
displayed in the fault
history.
Short circuit, boiler water
temperature sensor
Lead break, boiler water
temperature sensor
Short circuit, temperature
sensor aJA
Lead break, temperature
sensor aJA
Short circuit, temperature
sensor aJB
Lead break, temperature
sensor aJB
Fault, safety equipment
at "X7" of plug-in adaptor
2 for external safety
equipment
Fault, safety equipment
at "X3" of plug-in adaptor
2 for external safety
equipment
Fault, safety equipment
at "X2" of plug-in adaptor
2 for external safety
equipment
Fault, safety equipment
at "X1" of plug-in adaptor
2 for external safety
equipment
Therm-Control
configuration fault:
Plug aJA not plugged in.
Return temperature
control configuration
error:
Code "0C:1" in group 2
"Boiler" has been set, but
plug aJA is not plugged
in and/or code "4E:0" in
group 1 "General" is not
set.
Measures
Service the appliance.
Note: After the service, set
code "24:0" in group 2
"Boiler".
Check the boiler water
temperature sensor
(see page 110).
Check the boiler water
temperature sensor
(see page 110).
Check temperature sensor
(see page 110).
Check temperature sensor
(see page 110).
Without temperature sensor:
Set code "4A:0" in group 1
"General".
Check temperature sensor
(see page 110).
Check temperature sensor
(see page 110).
Without temperature sensor:
Set code "4B:0" in group 1
"General".
Check safety equipment, and
reset if required.
Check safety equipment, and
reset if required.
Check safety equipment, and
reset if required.
Check safety equipment, and
reset if required.
Insert plug aJA.
For Vitocrossal, code "0D:
0" in group 2 "Boiler" must be
selected.
Insert plug aJA and check
codes.
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