Midea DLFSAB Series User manual

Specifications subject to change without notice.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS ....................................................... 1
INTRODUCTION............................................................................ 1
MODEL NUMBER NOMENCLATURE ....................................... 2
AUXILLIARY CONTACTS FOUND ON THE MAIN BOARD .. 3
ROTARY AND DIP SWITCHES ................................................... 6
WIRING ........................................................................................... 8
CONNECTION DIAGRAMS AND CONTROL METHODS........ 9
WIRING DIAGRAMS..................................................................... 10
REFRIGERANT LINES .................................................................. 12
TROUBLESHOOTING ................................................................... 13
DIAGNOSIS AND SOLUTION...................................................... 16
APPENDICES.................................................................................. 36
DISASSEMBLY INSTRUCTIONS ................................................ 38
SAFETY CONSIDERATIONS
Installing, starting up, and servicing air-conditioning equipment can
be hazardous due to unit pressures, electrical components, and
equipment location (roofs, elevated structures, etc.).
Only trained, qualified installers and service mechanics should install,
start-up, and service this equipment.
Untrained personnel can perform basic maintenance functions such as
coil cleaning. All other operations should be performed by trained
service personnel only.
When working on the equipment, observe the precautions in the
literature and on tags, stickers, and labels attached to the equipment.
Follow all safety codes. Wear safety glasses and work gloves. Keep a
quenching cloth and fire extinguisher nearby when brazing. Use care
in handling, rigging, and setting bulky equipment.
Read this manual thoroughly and follow all the warnings or cautions
included in the literature and attached to the unit. Consult local
building codes and the National Electrical Code (NEC) for special
requirements.
Recognize safety information. This is the safety-alert symbol .
When you see this symbol on the unit and in instructions or manuals,
be alert to the potential for personal injury. Understand these signal
words: DANGER, WARNING, and CAUTION.
These words are used with the safety-alert symbol. DANGER
identifies the most serious of hazards which will result in severe
personal injury or death. WARNING signifies hazards which could
result in personal injury or death. CAUTION is used to identify
unsafe practices which may result in minor personal injury or product
and property damage. NOTE is used to highlight suggestions which
will result in enhanced installation, reliability, or operation.
INTRODUCTION
This service manual provides the necessary information to service,
repair, and maintain the indoor units. This manual contains an
“APPENDICES” on page 36 with data required to troubleshoot issues.
Use the “TABLE OF CONTENTS” on page 1 to locate a desired topic.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or
death. Before installing, modifying, or servicing the unit, the
main electrical disconnect switch must be in the OFF position.
There may be more than 1 disconnect switch. Lock out and tag
switch with a suitable warning label.
WA R N I N G
EXPLOSION HAZARD
Failure to follow this warning could
result in death, serious personal
injury, and/or property damage.
Never use air or gases containing
oxygen for leak testing or operating
refrigerant compressors. Pressurized
mixtures of air or gases containing
oxygen can lead to an explosion.
WAR NI NG
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
Do not bury more than 36 in. (914 mm) of refrigerant pipe in the
ground. If any section of pipe is buried, there must be a 6 in. (152
mm) vertical rise to the valve connections on the outdoor units. If
more than the recommended length is buried, refrigerant may
migrate to the cooler buried section during the extended periods
of unit shutdown. This causes refrigerant slugging and could
possibly damage the compressor at start-up.
CAUTION
DLFSAB and DLFLAB
Service Manual
Air Handler Unit Ductless System - Sizes 18 to 60

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2
MODEL NUMBER NOMENCLATURE
Table 1 — Unit Sizes
KBTUH V-PH-HZ ID MODEL NO.
18
208/230-1-60
DLFSABH18XB3
24 DLFSABH24XB3
30 DLFSABH30XB3
36 DLFSABH36XB3
36 DLFLABH36XA3
48 DLFLABH48XA3
60 DLFLABH60XA3
INDOOR UNIT
DLF
SL AH24 XA
K
DLF = INDOOR UNIT
S&L = MODEL
VOLTAGE
K = 208/230-1-60
INDOOR FAN COIL UNIT TYPE
A = AIR HANDLER
INDOOR FAN COIL TYPE
H = Heat Pump
MAXIMUM NUMBER OF FAN COIL UNITS
CONNECTED TO THE OUTDOOR UNIT
A=1:1
NOMINAL CAPACITY
18 - 1 1/2 TON
24 - 2 TONS
30 - 2 1/2 TONS
36 - 3 TONS
48 - 4 TONS
60 - 5 TONS
B
MAJOR SERIES A = VARIATION
X = NOT USED
21
22 10001
Week of Manufacture Sequential Serial Number
V
V = ALL MODELS
Year of Manufacture
Use of the AHRI Certified
TM Mark indicates a
manufacturer’s
participation in the
program For verification
of certification for individual
products, go to
www.ahridirectory.org.

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3
AUXILLIARY CONTACTS FOUND ON THE MAIN BOARD
Work Terminal Port CN23 - Normally Open Dry Contact (Output)
•The WORK terminal port is linked to the unit's indoor blower
• When the indoor blower is off, the contact is open
• When the indoor blower is running, the contact is closed
• There is no voltage from CN23, power is provided from the external control system and not from the unit.
• The contacts are rated at 250VAC and 10 AMP maximum
• If an active 24V signal output is required, G and C ports (thermostat connections) may be used instead.
Fig. 1 — Auxiliary Contacts
ALARM Terminal Port CN33 - Normally Open DRY CONTACT (OUTPUT):
• Allows the terminal port to connect to an external ALARM interface or annunciator
• There is no voltage from
CN33 , power is provided from the ALARM system and not from the unit.
• The contacts are rated at
250VAC and 10 AMP maximum
• When the unit experiences a problem, the contact closes, and the
ALARM is triggered.
Fig. 2 — Auxiliary Contacts

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4
WATER LEVEL Switch Terminal Port CN5 - SWITCH INPUT:
• To enable this switch, jumper J1 must be removed
• A field supplied float switch can be directly connected to
CN5
• CLOSED contacts = normal
• OPEN contacts = overflow
• When an overflow condition occurs, a signal is sent to the system to turn it off
•Alarm
EE appears.
Fig. 3 — Auxiliary Contacts
UV LED terminal port CN43 - OUTPUT 24VAC:
•The UV LED port is linked to the unit's fan
• When the fan is running, the relay is closed and there is an output of
24VAC through the contacts that can be used to power a compatible UV LED LIGHT
• May also be used to power a pilot relay with 24VAC coil to control other peripherals
Fig. 4 — Auxiliary Contacts

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5
Auxiliary Contacts found on the 24V interface Board:
Remote control (ON-OFF) terminal port CN2 and jumper JR1 - INPUT:
• Remove the jumper JR1 to enable the ON-OFF function
• When the remote switch is off (
OPEN ); the unit is OFF
• When remote switch is on ( CLOSE ); the unit is ON
• When the remote switch is close/open, the unit responds to the demand within 2 seconds
• When the remote switch is on, you can use the included remote controller or wired controller to operate the unit as normal.
• When the remote switch off, the unit will not respond to the command from the remote controller or wired controller and a CP code is displayed on the
board.
Fig. 5 — Auxiliary Contacts

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6
ROTARY AND DIP SWITCHES
Micro-Switch Setting:
Fig. 6 —Net Address
Micro-switch S1 and dial-switch S2 are for address setting when the user wants to control the unit with a central controller.
Range: 00-63
Fig. 7 — Unit Configuration
Fig. 8 — Unit Configuration Factory Settings
0
8
4
1
2
3
5
6
7
C
9
A
B
D
E
F
12
ON
0
8
4
1
2
3
5
6
7
C
9
A
B
D
E
F
12
ON
0
8
4
1
2
3
5
6
7
C
9
A
B
D
E
F
12
ON
0
8
4
1
2
3
5
6
7
C
9
A
B
D
E
F
12
ON
S1+S2
0~F 0~F 0~F 0~F
NETADDRESS
CODE
0~15 16~31 32~47 48~63
FACTORYS ETTING
FOR SETTING NETADDRESS
0
8
4
1
2
3
5
6
7
C
9
A
B
D
E
F
0~F ON~OFF
CODE
FACTORY
1 2 3
ON
4
SW1
12 3
ON
4
SW2
1 2 3
ON
4
SW3
S3
12 3
ON
4
SW4
12
ON
S4
24V THERMOSTATS SETTING
SETTI
ON~OFF ON~OFF ON~OFF ON~OFF

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7
CONNECTORS (CONT.)
Table 2 — Unit Configuration Settings
DIAL CODE FEATURES ON OFF (DEFAULT)
S3 Electric heating turns on outdoor T4 temperature
0 (zero) means that the temperature protection is not turned on.
1 through F maps to -4°F through 46°F (-20°C through 8°C).
Each increment represents 3.6°F (2°C).
SW1-1 Whether 24V control selection YES NO
SW1-2 Cold wind protection option NO YES
SW1-3 Single cooling/heating and cooling options Cooling Heating and Cooling
SW1-4 Set machine.single internal machine Indoor unit KIT
SW2-1 The first group controls the electric heating to turn on the
temperature difference 1.8°F (1°C) 3.6°F (2°C)
SW2-2 Whether the electric heating is delayed YES NO
SW2-3 Electric auxiliary heating delay start time 30 minutes 15 minutes
SW2-4 Electric heating/compressor allow opening limit Compressor allowed to operate to low
limit set by S3
Electric heating allowed to operate
to high limit set by S3
SW3-1 Continuous running time when the 1.8°F (1°C) set temperature
is not reached E-square value (0.5 hour) 1.5 hours
SW3-2 Cooling and heating Y2 signal setting temperature adjustment
value A 1.8°F (1°C) 3.6°F (2°C)
SW3-3 Hysteresis of the second group of electric heating 3.6°F (2°C) 5.4°F (3°C)
SW3-4 Reserve //
S4-1 Default ON Short circuit W1 and W2 W1, W2 separate
S4-2 Default ON DH is off by default DH on
SW4-1 000 is the default
000/001/010/011/100/101/110/111, internal machines with different abilities, electric heating and PSC classification for use
SW4-2
SW4-3

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8
WIRING
Use the following steps to wire the indoor unit.
NOTE: Wiring in this section is for the base unit ONLY.
1. Prepare the cable for connection.
a. Using wire strippers, strip the insulation from both ends of the
signal cable to reveal about 1/2 in (12mm) of wire.
b. Strip the insulation from both ends of the wires.
c. Use a wire crimper to crimp the fork terminals to the ends of
the wires.
2. Open the indoor unit’s front panel. Use a screwdriver to remove the
cover of the electric control box on the indoor unit.
3. Thread the power cable and the signal cable through the wire outlet.
4. Connect the fork terminals to the terminals. Match the wire colors/
labels with the labels on the terminal block.
5. Firmly screw the fork terminals of each wire to its corresponding
terminal. Refer to the serial number and wiring diagram located on
the cover of the electric control box.
Fig. 9 — Control Box and Wiring Diagram
6. Clamp down the cable with the cable clamp. The cable must not be
loose or put strain on the fork terminals.
7. Reattach the electric box cover.
Fig. 10 — Ferrite Core (Magnetic Ring)
The main power is supplied to the outdoor unit. When disconnecting the
power of the outdoor unit, the indoor unit would lose power. A disconnect
switch is not required on the indoor unit side on the wiring between the
outdoor and indoor unit. A 3 pole disconnect (purchased separately) may
be used for extra protection between the indoor and outdoor Unit.
Fig. 11 — Wiring Connection of Indoor Unit
The Auxiliary Heater must have a separate branch electric circuit with a
field-supplied disconnect switch located within sight from, and readily
accessible from, the unit.
Fig. 12 — Wiring Connection of Electric Heater
(optional)
While connecting the wires, strictly follow the wiring diagram.
The refrigerant circuit can become very hot.
Keep the interconnection cable away from the copper tube.
CAUTION
L1 L2 S
Pass the belt through the hole
of the ferrite core
(Magnetic Ring
to secure it to the cable
Circuit Breaker
3 Pole Disconnect
(purchased separately)
(purchased separately)
(purchased separately)
Electrical heater unit power wires
Electrical
heater
unit
Circuit Breaker
(DO NOT connect to
the indoor unit
circuit breaker!)

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9
CONNECTION DIAGRAMS AND CONTROL METHODS
The air handler fan coil unit can be controlled mainly through the
following methods.
• SCENARIO #1 Wired controller (Included, optional accessory) -
KSACN1001AAA:
Non-polarity controller used to operate all functions. The wired
controller is equipped with an infrared receiver and can be used in
conjunction with the wireless controller.
For this scenario to be enabled SW1-1 must be set to the OFF positions
(Default)
• SCENARIO #1 Wireless controller (Included):
Hand-held wireless remote provides the same functionality as the
wired controller and can be used in conjunction with the wired
controller. Refer to the owner’s manual for the remote’s operational
instructions.
For this scenario to be enabled SW1-1 must be set to the OFF position
(Default).
• SCENARIO #2 Third party heat pump thermostat (Not Included):
Allows the control of the air handler via the built-in 24V interface.
For this scenario to be enabled SW1-1 must be set to the ON position.
Fig. 13 — Connection Methods for 18K-36K Residential Units
Fig. 14 — Connection Methods for 36K-60K Light Commercial Units

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10
WIRING DIAGRAMS
Fig. 15 — Wiring Diagram Sizes 18K/24K/30K/36K - Non Light-Commercial Models
Table 3 — Wiring Diagram Sizes 18K/24K/30K/36K - Non Light-Commercial Models
INDOOR UNIT
MAINBOARD
Y/G
Cn1 8
CN2 3
Alarm
CN3 3
work

6
Cn1 0
CN 5
WATER LEVEL
CN4 6
T1
ECM

Cn15
M
4(3) 3
Cn34
CN4 3
UVLE D
Output
BLU E
RED
RED
TRAN S
CN2 2
RED
CN 9
J1
CN2 9
T2
Cn1 2
3
HEATER
2
CN1 1
L1
L2
RE D
BLAC K
TO OUTDOOR UNIT
OR POWER
2
NL
L and N :230VAC
SWITCH
Output:5VDC
Output:24VAC
Output:5VDC
Output:5VDC
Output:220VAC
Output:12VDC
Output:24VAC
Output:15VDC
Output:220VAC
Output:24VAC
JR1
CN 5
CN 4
Cn 1
CN2
ON/OF F
Remot e
Contro l
CN6 CN9 CN1 0 CN1 1
CN7
2 WIR E WIR E
CONTROLLE R
CN1 4
4
48 5 POR T
CN3
E Y X
To CCM
Comm.Bu s
Output:24VAC Output:24VAC
Output:+15VDC
Output:+12VDC
Output:+15VDC Output:+12VDC
Output:+5VDC
Output:24VAC Output:24VAC Output:24VAC Output:24VAC
Y/ G
DRY CONTACT
DRY CONTACT
T2B
T2A
CN 6
CN 21
Output:5VDC
2
2
Output:12VDC
S1 S2
CN2 0
COMMUNICATION
TO OUTDOOR UNIT
W1
DH
R C
L
G Y1
Y/Y 2
B
W
W2
E/AU X
24V THERMOSTAT
CODE PART NAME
ECM Indoor ECM Motor
T1 Room Temperature
T2 Coil Temperature Sensor
T2A Indoor Coil Inlet Temperature Sensor
T2B Indoor Coil Outlet Temperature Sensor

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WIRING DIAGRAMS (CONT)
Fig. 16 — Wiring Diagram Sizes 36K - 60K Light Commercial Models
Table 4 — Wiring Diagram Sizes 36K - 60K Light Commercial Models
CODE PART NAME
ECM Indoor ECM Motor
CAP Indoor Fan Capacitor
FAN Indoor Fan Motor
T1 Room Temperature Sensor
T2 Coil Temperature Sensor
T2A Indoor Coil Inlet Temperature Sensor
T2B Indoor Coil Outlet Temperature Sensor
INDOOR UNIT
MAINBOARD
Y/G
Cn1 8
CN2 3
Alarm
CN3 3
work

6
Cn1 0
CN 5
WATER LEVEL
CN4 6
T1
ECM

Cn15
M
4(3) 3
Cn34
CN4 3
UVLE D
Output
BLU E
RED
RED
TRAN S
CN2 2
RED
CN 9
J1
CN2 9
T2
Cn1 2
3
HEATER
2
CN1 1
NL
L and N :230VAC
SWITCH
Output:5VDC
Output:24VAC
Output:5VDC
Output:5VDC
Output:220VAC
Output:12VDC
Output:24VAC
Output:15VDC
Output:220VAC
Output:24VAC
JR1
CN 5
CN 4
Cn 1
CN2
ON/OFF
Remote
Control
CN6 CN9
W1
CN1 0
DH
CN1 1
CN7
2 WIR E WIRE
CONTROLLER
CN1 4
4
48 5 POR T
CN3
E Y X
To CCM
Comm.Bus
Output:24VAC Output:24VAC
Output:+15VDC
Output:+12VDC
Output:+15VDC Output:+12VDC
Output:+5VDC
Output:24VAC Output:24VAC Output:24VAC Output:24VAC
DRY CONTACT
DRY CONTACT
L1 （1）
L2 （2） S（3）
RE D
BLAC K
YELLO W
(WHITE )
TO OUTDOOR UNIT
3
S
S and N :0-24VDC
Y/ G
2
2
CN 6
Output:5VDC
CN2 1
Output:12VDC
T2 A T2 B
R C
L
G Y1
Y/Y 2
B
W
W2
E/AU X
24V THERMOSTAT

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12
REFRIGERANT LINES
General refrigerant line sizing
1. The outdoor units are shipped with a full charge of R410A refrigerant. All charges, line sizing, and capacities are based on runs of 25 ft. (7.6 m). For runs
over 25 ft. (7.6 m), consult the product data.
2. Minimum refrigerant line length between the indoor and outdoor units is 10 ft. (3 m).
3. Refrigerant lines should not be buried in the ground. If it is necessary to bury the lines, not more than 36 in. (914 mm) should be buried. Provide a
minimum 6 in. (152 mm) vertical rise to the service valves to prevent refrigerant migration.
4. Both lines must be insulated. Use a minimum of ½ in. (12.7 mm) thick insulation. Closed-cell insulation is recommended in all long-line applications.
5. Special consideration should be given to isolating interconnecting tubing from the building structure. Isolate the tubing so that vibration or noise is not
transmitted into the structure.
6. For piping runs greater than 25 ft. (7.6 m), add refrigerant up to the allowable length as specified in the product data.
Refrigerant Coil Specifications
Table 5 — Refrigerant Coil Specifications
UNIT SIZE 18 24 30/36/48 60
DUCTED INDOOR COIL
Number of rows 3 4 5
Tube pitch (a)x row pitch (b) in 0.83x0.53
mm 21x13.37
Fin Spacing FPI 20
mm 1.3 1.3 1.3 1.3
Fin type Louvered
Fin Material Gold hydrophilic aluminum
Tube outside dia. inch 0.276
mm 7
Nominal Tube Wall mm (inch) 0.00945 (0.24)
Tube Enhancement (Yes/ No) Yes
Tube Material Copper
Coil length x height x width inch 16.34x13.23x1.58x2 16.34x21.5x2.11x2 16.34x21.5x2.63x2
mm 415x336x40.11x2 415*546*53.48*2 415*546*66.85*2
Face area ft
2
3 4.88 4.88
Number of circuits 6 10 14
Metering Device inch No metering device in indoor unit - information provided in Outdoor Unit’s PSR
High Burst Pressure Psi (MPa) 550(3.79)
Low Burst Pressure Psi (MPa) 340(2.34)
Design (high/low) Burst Pressure Psi 550/340
Gas Pipe (size – connection type) In (mm) Ø1/2” (12.7) ø5/8” (15.9) ø5/8” (15.9) Ø7/8” (22)
Liquid Pipe (size – connection type) In (mm) Ø1/4” (6.35) ø3/8” (9.52) ø3/8” (9.52) ø3/8” (9.52)

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13
TROUBLESHOOTING
Test the voltage between P and N on back of the outdoor unit main PCB with a multimeter. If the voltage is lower than 36V, the capacitors are fully
discharged.
Error Display (Indoor Unit)
When the indoor unit encounters a recognized error, an error code appears (see Table 6).
Table 6 — Error Display (Indoor Unit)
For other errors: The display board may display a code or a code undefined by the service manual. Ensure the code is not a temperature reading.
Table 7 — Error Display on Two Way Communication Wired Controller
The other error codes displayed on the wire controller are the same from those on the unit.
DISPLAY ERROR INFORMATION SOLUTION
EH00 Indoor unit EEPROM parameter error Page 16
EL01 Indoor / outdoor unit communication error Page 17
EL16 Communication malfunction between adapter board and outdoor main board Page 32
EH03 The indoor fan speed is operating outside of the normal range (for some models) Page 22
EH60 Indoor room temperature sensor T1 is in open circuit or has short circuited Page 22
EH61 Evaporator coil temperature sensor T2 is in open circuit or has short circuited Page 22
EH62 Evaporator coil temperature sensor T2B is in open circuit or has short circuited Page 22
EH65 Evaporator coil temperature sensor T2A is in open circuit or has short circuited Page 22
ELOC Refrigerant Leakage Detection (for some models) Page 23
EH06 Communication error between indoor two chips --
EH0E Water-level alarm malfunction Page 24
EC07 The outdoor fan speed is operating outside of the normal range (for some models) Page 20
EC51 Outdoor unit EEPROM parameter error --
EC52 Condenser coil temperature sensor T3 is in open circuit or has short circuited Page 22
EC53 Outdoor room temperature sensor T4 is in open circuit or has short circuited Page 22
EC54 Compressor discharge temperature sensor TP is in open circuit or has short circuited Page 22
EC56 Evaporator coil outlet temperature sensor T2B is in open circuit or has short circuited (for free match indoor units) --
PC00 IPM malfunction or IGBT over-strong current protection Page 25
PC01 Over voltage or over low voltage protection Page 26
PC02 Top temperature protection of compressor or High temperature protection of IPM module Page 27
PC03 Low pressure protection (for some models) Page 28
PC04 Inverter compressor drive error Page 29
EC0d Outdoor unit malfunction Page 30
PC0L Low ambient temperature protection Page 30
FL09 Mismatch between the new and old platforms Page 32
DISPLAY MALFUNCTION OR PROTECTION SOLUTION
EH63 Communication error between wire controller and indoor unit ---
Turn off all power supplies or disconnect all wires to avoid electric
shock. While checking indoor/outdoor PCB, please equip oneself with
anti-static gloves or wrist strap to avoid damage to the board.
WA R N I N G
Electricity remains in capacitors even when the power supply is off.
Ensure the capacitors are fully discharged before troubleshooting.
WA R N I N G

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14
Quick Maintenance by Error Code
Review the following tables for common faulty parts associated with each error code.
Table 8 — Quick Maintenance by Error Code
Table 9 — Quick Maintenance by Error Code
PART REQUIRING REPLACEMENT ERROR CODE
EH 00 EL 01 EH 03 EH 60 EH 61 EH 62 EH 65 EL 0C EH 0E EC 53
Indoor PCB

x
Outdoor PCB
xxxxxxxx

Indoor fan motor
xxxxxxxxx
T1 sensor
xxxxxxxxx
T2 Sensor
xxxxxxxxx
T2B Sensor
xxxxxxxxx
T2A Sensor
xxxxxxxxx
T3 Sensor
xxxxxxxxxx
T4 Sensor
xxxxxxxxx

Reactor
xxxxxxxxx
Compressor
xxxxxxxxxx
Additional refrigerant
xxxxxxxxx
Water-level switch
xxxxxxxxx
Water pump
xxxxxxxxx
PART REQUIRING REPLACEMENT EC 54 EC 51 EC 5C EC 52 EC07/71/72/73 PC 00 PC 01 PC 02 PC 04 PC 03
Indoor PCB
xxxx x xxxxx
Outdoor PCB
  
Outdoor fan motor
xxxx  x  x
T3 Sensor
xxx  x xxxxx
TP Sensor
 xxx x xxxxx
Pressure sensor
xx  x x xxxxx
Reactor
xxxx x x  xxx
Compressor
xxxx x  xx  x
IPM module board
xxxx x  x
Low pressure protector
xxxx x xxxx 
Additional refrigerant
xxxx x xxxx 

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15
Quick Maintenance by Error Code (Cont.)
Table 10 — Quick Maintenance by Error Code
Table 11 — Quick Maintenance by Error Code
NOTE: For certain models, the outdoor PCB can not be removed separately. In this case, the outdoor electric control box
should be replaced as a whole.
PART REQUIRING REPLACEMENT EL 16 EH 0BPC 06 PC 08/44/ 49 PC 0A PC 0F
Indoor PCB x  xxxx
Outdoor PCB
 x 
Outdoor fan motor x x x  x
T3Sensor xxxx
 x
TP Sensor x x
 xxx
Pressuresensor xxxxxx
Reactor xxx
 x 
Compressor xxxxxx
IPM module board x x x
 xx
Data adapter board
 xxxx
High pressure valve assembly x x
 xxx
High pressure protector x x x x x x
Low pressure protector x x x x x x
Additional refrigerant x x
 x  x
PART REQUIRING REPLACEMENT PC 41 PC 43 PC 10/11/12 PC 30 PC 31 PC 40
Indoor PCB x x x x x x
Outdoor PCB

Outdoor fan motor x x x  xx
T3Sensor xxxxxx
TPSensor xxxxxx
Pressure sensor x x x x x x
Reactor x x
 xxx
Compressor x
 xxxx
IPM module board x x
 xx 
Data adapter board x x x x x x
High pressure valve assembly x x x x x x
High pressure protector x x x
 xx
Low pressure protector x x x x
 x
Additional refrigerant x x x x
 x
Electric control box x x x x x


DLFSAB and DLFLAB: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
16
DIAGNOSIS AND SOLUTION
EH00 - EEPROM Parameter Error Diagnosis and Solution
Description: Indoor or outdoor PCB main chip does not receive feedback from the EEPROM chip.
Recommended parts to prepare:
• Indoor PCB
• Outdoor PCB
Troubleshooting and Repair:
NOTE: The priority is EH00 followed by EC51.
Shut oīthe power and turn it on 2
minutes later.
Is it sƟůů
displaying the
error code? The unit is operaƟng normally.No
Replace the indoor main PCB (EH 00)/
outdoor main PCB (EC 51)
Yes

DLFSAB and DLFLAB: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
17
DIAGNOSIS AND SOLUTION (CONT.)
EL01 - Indoor and Outdoor Unit Communication Error Diagnosis and Solution
Description: Indoor unit can not communicate with the outdoor unit.
Recommended parts to prepare:
• Signal wires
• Magnet ring
• Indoor PCB
• Outdoor PCB
Troubleshooting and Repair:
XYE Communication:
Power o, then restart the unit
2 minutes later.
Use a shield cable grounding.
No
Yes
.
Correct the connection .
No
Yes
Yes
Replace the signal wire.
Yes
Pull out and re-insert.No
Replace the outdoor main PCB.
Check whether the signal wire is
shield cable or whether the
shield cable is ground.
Check whether the wire has the correct
polarity; P to P, Q to Q, or E to E.
Check whether the signal wire is broken.
Check whether the signal wires
are inserted on the PCB rmly.
Check whether there is any interference.
Are there too many lamps, power transformers?
Is the signal wire too long?
Yes
No
No
Replace the indoor main PCB.
Is the error resolved?
Yes
No
Remove the interference or
add a magnet ring on the power wire.

DLFSAB and DLFLAB: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
18
DIAGNOSIS AND SOLUTION (CONT.)
(S) Current Loop Communication:
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be
replaced as a whole.
Does the error code
disappear?
Power off , then restart the unit af ter 2
minutes.
Measure the DC voltage between N/L2
and S (Black pin to S , Red pin to N/L2).
The value is fixed and close
to 0
The value is alt ernative
from negative to positive
The value is alw ays posit ive
Check t he w irin g con nection
bet ween in door and o ut door
unit, are t hey goo d?
Check t he w irin g con nection
from outdoor terminal to
outdoor PCB and wiring
bet ween PCBs if t here is
mo re t han 1 PCB
Check t he w irin g con nection
from indoor terminal to indoor
PCB, are t hey goo d?
Check if t he pow er LED is
on?
Yes
Yes
Unplug all the high voltage
components connected t o main
PCB such as 4 way valve, heater,
AC f an on e by one t o check th eir
resist ance. Is ther e any comp onent
short circuit?
Unplug electronic expansion valve.
Check if power LED ison?
No
No
Check t he AC volt age of L, N
output t o IPM board, is it same
as pow er inpu t?
Check t he DC 5V, 12V
from IPM board t o main
PCB, are t hey normal?
Unplug all the high voltage
components connected t o main
PCB such as 4 way valve, heater,
AC f an on e by one t o check th eir
resist ance. Is ther e any comp onent
short circuit?
Yes
No
Unplug electronic expansion valve.
Check if t he DC 5V, 12V to m ain
PC B ar e O K
Replace short-circuited
component and main
PCB
Replace coil of elect ronic
expansion valve
Replace o ut door PCB
Replace short-circuited
component and outdoor
PCB
Yes
Yes
Yes
Yes
Replace main PCB
No
Yes
No
Replace IPM board
No
Repalce indoor PCB
So l ve d
Correct the connection or
change w ires
No
No
Yes
For units with main PCB and IPM board
both
For units with only one
PCB
No

DLFSAB and DLFLAB: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
19
REMARKS:
• Use a multimeter to test the DC voltage between the 2 port (or S or L2 Terminal) and the 3 port (or N or S Terminal) of the outdoor unit.
• The red pin of the multimeter connects with the 2 port (or S or L2 port) while the black pin is for the 3 port (or N or S Terminal).
• When the unit is normal running, the voltage is moving alternately as positive values and negative values.
• If the outdoor unit malfunctions, the voltage remains a positive value.
• If the indoor unit malfunctions, the voltage does not change.
• Use a multimeter to test the reactor resistance which does not connect with the capacitor.
• The normal value should be around zero ohm. Otherwise, the reactor has malfunctioned.
NOTE: The figures and values are for reference only, actual condition and specific value may vary.
S and N
or
L2 and S
or
2 and 3

DLFSAB and DLFLAB: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
20
DIAGNOSIS AND SOLUTION (CONT.)
EH03 / EC07 - Fan Speed Is Operating Outside of Normal Range / EC 71 Over Current Failure of
Outdoor DC Fan Motor / EC73 Zero-speed failure of outdoor DC fan motor Diagnosis and Solution
Description: When the indoor / outdoor fan speed operates at too low or too high a speed for a certain time, the unit ceases
operation and the LED displays the failure.
Recommended parts to prepare:
• Connection wires
• Fan assembly
•Fanmotor
•PCB
Troubleshooting and Repair:
NOTE: For certain models, the outdoor PCB cannot be removed separately. In this case, the outdoor electric control box should
be replaced as a whole.
YES
Power o. Restart the unit after 2 minutes.
Is it within normal parameters?
Replace the fan motor.
Does a problem remain? The unit is operating normally.NO
Shut o the power supply.
Rotate the fan by hand.
YES
Does it turn easily? Inspect the unit for an obstruction and remove.NO
Check the fan motor wiring.
YES
Is it improperly wired? Ensure the proper connections.
Measure the voltage for
the fan motor from the PCB.
YES
Replace the main PCB.NO