62
Service Manual
Installation and Maintenance
9. Maintenance
9.1 Flashing LED of Indoor/Outdoor Unit and Primary Judgement
No.
Malfunction
Name
Dual-8
Code
Display
Display Method of
Outdoor Unit
(Indicator has 3 kinds
of display status and
they will be displayed
circularly every 5s.)
A/C status
Possible Causes
□OFF ■Illuminated
☆
Blink
D5
(D40)
D6
(D41)
D16
(D42)
D30
(D43)
1
High
pressure
protection of
system
E1
□
☆
☆
☆
During cooling and drying operation,
except indoor fan operates, all loads
stop operation.
During heating operation, the
complete unit stops.
1. Refrigerant was superabundant;
2. Poor heat exchange (including filth blockage of heat
exchanger and bad radiating environment );
3. Ambient temperature is too high.
2
High
discharge
temperature
protection of
compressor
E4
■
□
■
☆
During cooling and drying operation,
compressor and outdoor fan stop
while indoor fan operates. During
heating operation, all loads stop.
Please refer to the malfunction analysis (discharge
protection, overload).
3
Overcurrent
protection
E5
□
■
☆
□
During cooling and drying operation,
compressor and outdoor fan stop
while indoor fan operates. During
heating operation, all loads stop.
1. Supply voltage is unstable;
2. Supply voltage is too low and load is too high;
3. Evaporator is dirty.
4
Communi-
cation
Malfunction
E6
□
□
□
☆
During cooling operation,compressor
stops while indoor fan motor
operates. During heating operation,
the complete unit stops.
Refer to the corresponding malfunction analysis.
5
High
temperature
resistant
protection
E8
■
□
■
■
During cooling operation:
compressor will stop while indoor
fan will operate. During heating
operation, the complete unit stops.
Refer to the malfunction analysis (overload, high
temperature resistant).
6
PG motor
(indoor fan
motor) does
not operate
H6
Indoor fan, outdoor fan, compressor
and electric heat tube stop operation.
Horizontal louver stops at the current
position.
1. The feedback terminal of PG motor is not connected
tightly.
2. The control terminal of PG motor isnot connected
tightly.
3. Fan blade rotates unsmoothly.
4. Malfunctionof moto.r
5. Controller is damaged.
7
Malfunction
protection of
jumper cap
C5
Operation of remote controller or
control panel is available, but the unit
won't act.
1. There's not jumper cap on the controller.
2. Jumper cap is not inserted properly and tightly
3. Jumper cap is damaged.
4. Controller is damaged.
8
Indoor
ambient
temperature
sensor is
open/short
circuited
F1
During cooling and drying operation,
indoor unit operates while other loads
will stop; during heating operation,
the complete unit will stop operation.
1. The wiring terminal between indoor ambient
temperature sensor and controller 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.
9
Indoor
evaporator
temperature
sensor is
open/short
circuited
F2
The unit will stop operation as it
reaches the temperature point.
During cooling and drying operation,
except indoor fan operates, other
loads stop operation; During heating
operation, the complete unit stops
operation.
1. The wiring terminal between indoor evaporator
temperature sensor and controller 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.
10
Outdoor
ambient
temperature
sensor is
open/short
circuited
F3
□
□
☆
■
During cooling and drying
operating, compressor stops while
indoor fan operates; During heating
operation, the complete unit will stop
operation
Outdoor temperature sensor hasnt been connected
well or is damaged. Please check it by referring to the
resistance table for temperature sensor)
