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5693 982 - 04
Vitotronic 300, GW2B Installation and Service
Fault Display
(continued)
Troubleshooting
Displayed
fault code
System characteristics Cause
Measures
9C
No solar DHW
heating.
Lead break, DHW tank temperature sensor,
temperature sensor connection
%
at solar
control module.
Check sensor at the solar control
unit (see separate installation and
service instructions).
9E
Control mode.
No flow rate in solar circuit or flow rate too
low, or temperature limiter has responded.
Check solar circuit.
Acknowledge fault message
(see separate installation and
service instructions).
9F
Control mode.
Solar control module faulty.
Displayed if a fault occurs at these appliances
for which there is no fault code in the
Vitotronic.
Check solar control unit
(see separate installation and
service instructions).
A0
Boiler cools down.
Fault, safety equipment at “X7”
of plug-in adaptor 2 for external safety
equipment.
Check safety equipment,
and reset if required.
A1
Boiler cools down.
Fault, safety equipment at “X3”
of plug-in adaptor 2 for external safety
equipment.
Check safety equipment,
and reset if required.
A2
Boiler cools down.
Fault, safety equipment at “X2”
of plug-in adaptor 2 for external safety
equipment.
Check safety equipment,
and reset if required.
A3
Boiler cools down.
Fault, safety equipment at “X1”
of plug-in adaptor 2 for external safety
equipment
Check safety equipment,
and reset if required.
AA
Control mode.
Therm-Control configuration fault:
Plug
aJ
A not plugged in.
Insert plug
aJ
A.
For Vitocrossal, code “0d:
0” must be selected.
Ab
Control operation;
DHW tank may be
cold.
Primary store system configuration error:
Code “55:3” has been selected,
but plug
aJ
B is not plugged in
and/or Codes “4C:1” and “4E:2”
have not been set.
Insert plug
aJ
B and check codes.
AC
Control mode.
Return temperature control configuration
error:
Code “0C:1” in group 2 “Boiler” has been
selected, but plug
aJ
is not plugged in and/or
code “4E:1” has not been set.
Insert plug
aJ
A and check codes.
