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9. Troubleshooting
9.1 Precautions before Performing Inspection or Repair
Be cautious during installation and maintenance. Do operation following the regulations to avoid electric shock and casualty or even
death due to drop from high attitude.
* Static maintenance is the maintenance during de-energization of the air conditioner. For static maintenance, make sure that the unit
is de-energized and the plug is disconnected.
* Dynamic maintenance is the maintenance during energization of the unit. Before dynamic maintenance, check the electricity
and ensure that there is ground wire on the site. Check if there is electricity on the housing and connection copper pipe of the air
conditioner with voltage tester. After ensure insulation place and the safety, the maintenance can be performed.
Take sufficient care to avoid directly touching any of the circuit parts without first turning
At times such as when the circuit board is to be replaced, place the circuit board assembly in a vertical position.
Normally,diagnose troubles according to the trouble diagnosis procedure as described below.(Refer to the check points in
servicing written on the wiring diagrams attached to the indoor/outdoor units.)
9.2 Judgement by Flashing LED of Indoor/Outdoor Unit
Display Method of Indoor Unit
No.
Malfunction
Cód.
Name
Error
Indoor ambient
temperature
1
sensor is
F1
open/short-
circuited
Indoor
evaporator
temperature
2
F2
sensor is
open/short-
circuited
Blocked
3
protection of
H6
IDU fan motor
Malfunction
C5
4
protection of
jumper cap
Zero-crossing
inspection
circuit
6
U8
malfunction
of the IDU fan
motor
34
Indicator lamp (Only for
the unit with indictor;
during blinking, ON for
0.5S and OFF for 0.5S)
Operation
COOL
HEAT
Lamp
Lamp
Lamp
Blinks
once
every
3s
Blinks
twice
every
3s
Blinks
11 times
every 3s
Blinks 15
times
every 3s
Blinks 17
times
every 3s
A/C Status
The unit will stop operation
as it reaches the temperature
point. During cooling and
drying operation, except IDU
fan motor operates, other
loads stop operation; During
heating operation, the system
stops operation.
The unit will stop
operation as it reaches
the temperature point.
During cooling and drying
operation, except IDU fan
operates, other loads stop
operation; During heating
operation, the complete unit
stops operation.
IDU fan, ODU fan,
compressor and electric
heat tube stop operation.
Horizontal louver stops at the
current position.
Operation of remote
controller or control panel is
available, but the unit won't
act.
Operation of remote
controller or control panel is
available, but the unit won't
act.
f the power.
Possible Causes(For specific maintenance
method, please refer to the following procedure
of troubleshooting)
1. The wiring terminal between indoor ambient
temperature sensor and main board is loosened
or poorly contacted;
2. There's short circuit due to trip-over of the parts
on controller;
3.Indoor ambient temperature sensor is damaged
(Please check it by referring to the resistance
table for temperature sensor)
4. Main board is broken.
1. The wiring terminal between indoor evaporator
temperature sensor and main board is loosened
or poorly contacted;
2. There's short circuit due to the trip-over of the
parts on controller;
3.Indoor evaporator temperature sensor is
damaged (Please check it by referring to the
resistance table for temperature sensor)
4. Main board is broken.
1.The feedback terminal of PG motor is not
connected tightly.
2.The control terminal of PG motor is not
connected tightly.
3.Fan blade rotates unsmoothly.
4.Malfunction of motor
5.Main board is broken.
1.There's not jumper cap on the main board.
2.Jumper cap is not inserted properly and tightly.
3.Jumper cap is damaged.
4.Controller is damaged.
1.Quick de-energization and energization. Wrong
judgement by the controller because the electric-
discharging of capacitor is slow.
2.Zero-crossing inspection circuit of main board
for controller is abnormal.
Troubleshooting
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