-
44
-
Outdoor fan motor error
[Defective fan motor, connector
poor connection, defective PCB]
Is connector connection good?
YES
NO
NO
Is the output of the outdoor unit’s
printed circuit board normal?
Normal
NO
YES
YES
Correct connector connection
Is DC fan motor resistance value good?
Defective outdoor PCB
Replace outdoor fan motor
* Disconnect the fan motor
connector, then investigate
the DC fan motor and out-
door unit circuit board sepa-
rately.
Rotor lock
[Compressor defect, outdoor
unit circuit defect]
NO
YES
¡
Check compressor wiring visually.
¡
Check insulation resistance. (1 M
Ω
or over)
¡
Check coil wire resistance. (Few
Ω
)
Is output voltage applied to all 3
phases of power transistor?
Inspect compressor.
Defective outdoor PCB
If check results are normal,
compressor is locked.
1
Humidity sensor operation
Failure mode
Control input circuit reading
Air conditioning system operation
1
Disconnected wire
2
Disconnected wire
Humidity reading is 0%
Anti-condensation control is not done.
12
Disconnected wire
1
and
2
are short
Humidity reading is 100%
Anti-condensation control keep doing.
circuited
Disconnected
wire
Short
Circuit
Remark: Do not perform a continuity check of the humidity sensor with a tester. If DC current is applied, it
could damage the sensor.
Humidity sensor
element
Connector
(CnF)
Humidity sensor assembly
(8)
Phenomenon observed after shortcircuit, wire breakage on sensor
(a)
Indoor unit
Phenomenon
Sensor
Shortcircuit
Disconnected wire
Cooling
Release of continuous compressor operation command
Heating
Continuous compressor operation command is not released.
Cooling
System can be operated normally.
Heating
High pressure control mode (Inverter stop command)
Humidity Sensor
Cooling
1
in the table below.
Heating
Normal system operation is possible.
Operation
mode
Room temperature
sensor
Continuous compressor operation command is not released.
Release of continuous compressor operation command
Continuous compressor operation command is not released.
(Anti-frosting)
Hot keep (Indoor fan stop)
1
in the table below.
Heat exchanger
sensor
