Fault
code
on the
display
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
9C
X
X
Control mode
Temperature
sensor lead
broken; con-
nects to the
Vitosolic at
S2
Check the sensor
at the Vitosolic.
9F
X
X
Control mode
Solar control
unit fault;
displayed if a
fault without
fault code
occurs at the
solar control
unit
Check the solar
control unit (see
solar control unit
service instruc-
tions).
A2
X
Emergency
mode with in-
sufficient sys-
tem pressure,
triggered by
code "0d" (see
page 41)
System
pressure too
low
Top up with water
A4
X
Control mode
Max. system
pressure ex-
ceeded
Check system
pressure.
Check the func-
tion and sizing of
the diaphragm ex-
pansion vessel.
Vent the heating
system.
Code "0E" is set
to 1 to document
the fault. After the
fault has been re-
moved, reset
manually to 0.
A7
X
Control mode
as per deliv-
ered condition
Faulty pro-
gramming
unit.
Replace the pro-
gramming unit.
Fault codes
(cont.)
73
Troubleshooting
5692
761
GB
Содержание Vitodens 200-W WB2B Series
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