SERVICE MANUAL
R
−
410A Ductless Split System: DLF4(A/H), DLC4(A/H)
50
421 08 9204 00
UNIT 18K & 24K, 230 Volts
Malfunction
Indoor Unit Display
Outdoor unit display
(LED’s have 3 modes)
OFF,
ON,
Flash
Operation Status
Malfunction
Error
Code
Display
Indicator Display
(LED Flash 0.5s
−
ON/0.5s
−
OFF
Running
LED
Cooling
LED
Heating_
LED
D40
/D5
D41
/D6
D42/
D16
D43/
D30
System High Pressure
protection
E1
flash 1
times
Cooling or Dehumidifying,
compressor and outdoor
fan motor stop, indoor fan
motor runs. Heating: all
stop.
1. System high press,
excess refrigerant.
2. Dirty outdoor heat
exchanger.
3. Outdoor ambient
temp is too high.
Anti
−
freezing protection
E2
flash 2
times
Cooling or Dehumidifying,
compressor and outdoor
fan motor stop, indoor fan
motor runs. Heating: all
stop.
1. Indoor unit return
blocked.
2. Low indoor fan
motor speed.
3. Evaporator is dirty.
Compressor discharge
high temp protection
E4
flash 4
times
Cooling or Dehumidifying,
compressor and outdoor
fan motor stop, indoor fan
motor runs. Heating: all
stop.
Refer to compressor
discharge protection
temp.
AC overload protection
E5
flash 5
times
Cooling or Dehumidifying,
compressor and outdoor
fan motor stop, indoor fan
motor runs. Heating: all
stop.
1. Power supply is
unstable, too much
variation.
2. Power supply
voltage is low.
Indoor/Outdoor
communication
malfunction
E6
flash 6
times
Cooling, compressor
stop, and indoor fan
motor runs, Heating:all
stop.
Communication line
failure. Main PCB
failure. Outside
interference, Wiring
error. Condensate
pump failure.
Anti
−
High temp
protection
E8
flash 8
times
Cooling, compressor
stop, and indoor fan
motor runs, Heating:all
stop.
Refer to
troubleshooting
section of manual.
Indoor unit fan motor no
feedback
H6
flash 11
times
System will stop
1. Indoor control
board AP1
malfunction.
2. Indoor motor M1
malfunction.
Jumper connection
malfunction protection
C5
flash 15
times
System will stop
Indoor control board
AP1 jumper not
inserted or broken
Indoor ambient
temperature sensor
malfunction
F1
flash 1
times
Cooling, Dehumidifying;
indoor fan motor runs, all
else stop. Heating all
stops
1. Room temp sensor
is not connected to
the control board AP1.
2. Room temp sensor
is damaged.
Indoor evaporator
sensor open circuit/short
circuit
F2
flash 2
times
Cooling, Dehumidifying;
indoor fan motor runs, all
else stop. Heating all
stops
1. Tube temp sensor
is not connected to
the control board AP1.
2. Tube temp sensor
is damaged.
Outdoor ambient sensor
open circuit/short circuit
F3
flash 3
times
Cooling, Dehumidifying;
compressor will stop, and
indoor fan motor runs.
Heating all stop.
Outdoor temp sensor
not connected or
damaged, check
sensor resistance
value
Outdoor condenser
sensor open circuit/short
circuit
F4
flash 4
times
Cooling, Dehumidifying;
compressor will stop, and
indoor fan motor runs.
Heating all stop.
Outdoor temp sensor
not connected or
damaged, check
sensor resistance
value.
Compressor discharge
temp sensor open
circuit/short circuit
F5
flash 5
times
Cooling, Dehumidifying
will run for 3 mins, then
compressor will stop, and
indoor fan motor will start,
Heating will run 3 mins
then stop.
1. Discharge temp
sensor not connected
or damaged, check
sensor resistance
values.
2. Sensor head not
located correctly.
