28 _ Troubleshooting
Information
Type
Infor-
mation
Code
Causes
Corrective Actions
Description of Photo
Communication
AC
• The signals between the
sub and main PBAs are
not sensed.
• Incorrect wire Connections
between the Sub and Main
PBAs.
• Check the wire connections and
terminal contacts between the sub
and main PBAs.
• Check for disconnected wires.
• Check whether the sub PBA
is short-circuited because of
moisture.
• If the main PBA’s communication
circuit is faulty, replace it.
-
AC6
• The signals between the
main and Inverter PBAs
are not sensed.
• Incorrect wire Connections
between the main and
inverter PBAs.
• Check the wire connections and
terminal contacts between the
main and inverter PBAs.
• Check for disconnected wires.
• If the main or Inverter PBA’s
communication circuit is faulty,
replace it.
-
AC2
• The diagnosis of the I/O
Board communication
error.
• Check the wire connections and
terminal contacts between the sub
and main PBAs.
• Check for disconnected wires.
• Check whether the sub PBA
is short-circuited because of
moisture.
• If the main PBA’s communication
circuit is faulty, replace it.
-
Communication
AC3
• The diagnosis of the DR
communication error.
• Check the wire connections and
terminal contacts between the
main and inverter PBAs.
• Check for disconnected wires.
• If the main or Inverter PBA’s
communication circuit is faulty,
replace it.
-
AC4
• The diagnosis of the Wifi
communication error.
• Check the wire connections and
terminal contacts between the sub
and main PBAs.
• Check for disconnected wires.
• Check whether the sub PBA
is short-circuited because of
moisture.
• If the main PBA’s communication
circuit is faulty, replace it.
-
AC5
• The diagnosis of the LCD
communication error.
• Check the wire connections and
terminal contacts between the
main and inverter PBAs.
• Check for disconnected wires.
• If the main or Inverter PBA’s
communication circuit is faulty,
replace it.
-
Power
UC
(9C)
• Power condition fault.
• An error occurs when
under or over voltage is
supplied.
• Plug receptacle is used
• Main PBA fault.
(sometimes)
• Check the consumer’s power
conditions. : Make sure to check
the operating voltage.
• Connect a tester to the internal
power terminals during the Boil
or Dry operations and observe
the washing machine’s operation
carefully.
: Check the voltages. (An error
occurs when under or over voltage
is supplied.)
: Check whether a plug receptacle
is used. When the connecting wire
is 1m, a momentary low voltage
may drop up to 10 V.
• Main PBA fault. (sometimes)
-