Viessmann VITOTRONIC300 Installation And Service Instructions Manual page 73

Vitotronic 300, GW2B Installation and Service
Fault Display
(continued)
Displayed System characteristics Cause
fault code
9C No solar DHW
heating.
9E Control mode.
9F Control mode.
A0 Boiler cools down.
A1 Boiler cools down.
A2 Boiler cools down.
A3 Boiler cools down.
AA Control mode.
Ab Control operation;
DHW tank may be
cold.
AC Control mode.
Lead break, DHW tank temperature sensor,
temperature sensor connection % at solar
control module.
No flow rate in solar circuit or flow rate too
low, or temperature limiter has responded.
Solar control module faulty.
Displayed if a fault occurs at these appliances
for which there is no fault code in the
Vitotronic.
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.
Primary store system configuration error:
Code "55:3" has been selected,
but plug aJB is not plugged in
and/or Codes "4C:1" and "4E:2"
have not been set.
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.
Troubleshooting
Measures
Check sensor at the solar control
unit (see separate installation and
service instructions).
Check solar circuit.
Acknowledge fault message
(see separate installation and
service instructions).
Check solar control unit
(see separate installation and
service instructions).
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" must be selected.
Insert plug aJB and check codes.
Insert plug aJA and check codes.
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