SERVICE MANUAL
R
−
410A Ductless Split System: DLF4(A/H), DLC4(A/H)
52
421 08 9204 00
UNIT 18K & 24K, 230 Volts (Cont.)
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
PFC protection
HC
flash 6
times
Cooling, Dehumidifying;
compressor stops and
indoor fan motor runs.
Heating all stop.
Refer to
troubleshooting
section of manual.
Compressor speed
reduction
H7
flash 7
times
Cooling, Dehumidifying;
compressor stops and
indoor fan motor runs.
Heating all stop.
Refer to
troubleshooting
section of manual.
Heating, high temp
H0
flash 10
times
Cooling, Dehumidifying;
compressor stops and
indoor fan motor runs.
Heating all stop.
Refer to
troubleshooting
section of manual.
Start
−
up failure
LC
flash 11
times
Cooling, Dehumidifying;
compressor stops and
indoor fan motor runs.
Heating all stop.
Refer to
troubleshooting
section of manual.
Compressor current
circuit malfunction
U1
flash 13
times
Replace outdoor
board AP1.
EEPROM malfunction
EE
flash 15
times
Cooling, Dehumidifying;
compressor stops and
indoor fan motor runs.
Heating all stop.
Replace outdoor
board AP1.
Capacitor charge
malfunction
PU
flash 17
times
Cooling, Dehumidifying;
compressor stops and
indoor fan motor runs.
Heating all stop.
Refer to capacitor
charging in this
service manual.
Module Sensor circuit
malfunction
P7
flash 18
times
Cooling, Dehumidifying;
compressor stops and
indoor fan motor runs.
Heating all stop.
Replace the outdoor
boar AP1.
Module over temp
protection
P8
flash 19
times
Cooling, Dehumidifying;
compressor stops and
indoor fan motor runs.
Heating all stop.
Check the IPM heat
sink or replace
outdoor board AP1.
Low DC bus voltage
U3
flash 20
times
Cooling, Dehumidifying;
compressor stops and
indoor fan motor runs.
Heating all stop.
Supply voltage is not
stable.
Low DC bus voltage
protection
PL
flash 21
times
Cooling, Dehumidifying;
compressor stops and
indoor fan motor runs.
Heating all stop.
1. Check supply
voltage, if voltage
lower than 150VAC,
restart the unit when
the power supply is
normal.
2. Check reactor L
connection.
IPM temp high
limit/decrease
compressor run speed
EU
Operation normal,
compressor speed
reduced
Check the IPM heat
sink or replace
outdoor board AP1.
Four
−
way valve
malfunction
U7
In heating mode, all stop
1. Supply voltage is
lower than 175VAC.
2. 4
−
way valve.
terminal loose/broken
3. 4
−
way valve
damaged.