Mitsubishi Electric GUG-01SL-E User manual

Warning:
Repair work must be performed by the manufacturer, its service
agent or a similarly qualified person in order to avoid hazards.
DIRECT EXPANSION COIL UNIT FOR LOSSNAY
HANDBOOK
February 2019 No. U220-A
MODELS
GUG-01SL-E
GUG-02SL-E
GUG-03SL-E
Nameplate
Note: "Direct expansion coil unit" is abbreviated as "Dx-coil unit."

Contents
1. Safety precautions .................................................................... 3-4
2. Names and functions of components ........................................... 4
3. Specifications ............................................................................... 5
4. Outside dimensions...................................................................... 6
5. Electrical wiring diagram ............................................................. 7
6. Circuit board diagrams ............................................................. 8-9
7. Troubleshooting .................................................................... 10-34
8. Overhauling procedures
....................................................... 35-46
9. Parts catalog
........................................................................ 47-65
GUG-01SL-E................................................................... 48-53
GUG-02SL-E................................................................... 54-59
GUG-03SL-E................................................................... 60-65

─3 ─
Read the following precautions thoroughly before the maintenance, and then inspect and repair the product in a
safe manner.
The types and levels of danger that may arise if the product is handled incorrectly are described with the warning
symbols shown below.
Warning
Modification is prohibited
Do not modify the unit.
(Failure to heed this warning may result
in electric shock, fire and/or injury.)
Electric shock
If you must inspect the circuitry while the power is
on, do not touch the live parts.
(Failure to heed this warning may result
in electric shock.)
Check insulation
Upon completing repair work, always measure the
insulation resistance. Verify that it is at least 10 MΩ
(with a 500-V DC insulation resistance tester), and
then turn on the power.
(Inadequate insulation may result in
electric shock.)
Incorrect handling of the product may
result in serious injury or death.
Proper electric work
Use the electric wires designated for electric work,
and conduct electric work in accordance with your
local "Electric Installation Engineering Standard",
the "Indoor Wiring Regulations" and the installation
instructions.
(Improper connection or wiring installation
may result in electric shock and/or fire.)
Replace damaged and/or degraded parts
Be sure to replace the power cord and lead wires if
they are damaged and/or degraded.
(Failure to heed this warning may result
in electric shock and/or fire.)
Use proper parts and tools
For repair, be sure to use the parts listed in the
service parts catalog of the applicable model and
use the proper tools.
(Failure to heed this warning may result in
electric shock, fire and/or injury.)
Caution against
electric shock
Prohibited
Be sure to follow
this instruction.
Turn off the power supply
Be sure to shut off the power supply isolator before
disassembling the unit for repair.
(Failure to heed this warning may result
in electric shock.)
Be sure to follow
this instruction.
1. Safety precautions
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Use only the specified refrigerant (R410A) to
charge the refrigerant lines.
• Do not mix it with any other refrigerant and do not
allow air to remain in the lines.
( If air is mixed with the refrigerant, then it can cause
abnormal high pressure in the refrigerant line, and
may result in an explosion and other hazards. )
(
The use of any refrigerant other than that specified
for the system will cause mechanical failure or
system malfunction or unit breakdown. In the worst
case, this could seriously damage product safety.)
• Tighten all flare nuts as specified using
a torque wrench.
( If tightened too much, the flare nut can
break after an extended period. )
Toxic gas generation
• Be careful that the refrigerant (R410A) does not
leak in a flammable environment.
• Conduct welding operation in an open room.
• If the refrigerant gas leaks, open the windows while
servicing.
• Be sure to completely repair the leak. Close the
service valve if the repair work is temporarily sus-
pended.
( If the refrigerant gas comes into contact
with flames such as open fire, sparks
and a heater, it may generate toxic gas. )
Be sure to follow
this instruction.
Be sure to follow
this instruction.

─4 ─
Make sure that the product operates properly upon completion of repair. Clean the product and the surrounding
area, and then notify the customer of the completion of repair.
Notes for servicing
●Inspect the earth condition, and repair it if it is incomplete. Make sure that a power supply isolator or an over-
load protection device is installed, if it is not installed, recommend the customer to install one.
Caution Incorrect handling of the product may result in injury or
damage to properties including buildings and equipment.
Caution for injury
Do not work at a location where you do not have a
sure footing.
(Failure to heed this caution may result in
a fall.)
Wear gloves
Wear gloves when servicing.
(Failure to heed this caution may result in
injury to your hands from sharp metal or
other edges.)
Be sure to follow
this instruction.
Prohibited
Prevent water leakage
• Before removing any of the water-related parts,
completely drain the residual water from the piping.
• Upon completing repair work, be sure to check the
drainage of the unit and that no water leaks from
any of the piping connections.
(Water leakage may cause buildings to
soil, leading to secondary failure of other
parts.)
Be sure to follow
this instruction.
2. Names and functions of components
Heat exchanger
Drain pump
Control box
Supply air (SA) thermistor
(Only for GUG-02SL-E and GUG-03SL-E)
Note
The drain pump always runs in the cooling mode and continues to run for
six minutes after the unit stops.

─5 ─
3. Specifications
Model name Running current
(A)
Input power
(W)
Dimension (mm) Weight (kg)
Width Depth Height
GUG-01SL-E
Less than 0.1 A 2.5 W (Heating / Fan)
12.4 W (Cooling)
492 812 330 21
GUG-02SL-E 492 1034 394 26
GUG-03SL-E 461 1130 404 28
*The running current and the input power are based on 230 V/50 Hz.
Operation ranges
Lossnay unit Dx-coil unit Remote controller PZ-01RC
Outdoor air -15˚C to +40˚C (*1) - -
Return air (*2) +40˚C, 80%RH or less - -
Ambient condition
0˚C to +40˚C, 80%RH or less 0˚C to +40˚C, 80%RH or less 0˚C to +40˚C
(*1) -15˚C to -10˚C : Intermittent operation takes 60 min. for ON and 10 min. for OFF.
-15˚C or lower : Intermittent operation takes 55 min. for OFF and 5 min. for ON.
(*2) Air conditioned room air.
Guaranteed operation ranges [Outdoor air]
Operation mode Outdoor unit
PUHZ-ZRP35, PUHZ-ZRP50
PUHZ-ZRP71, PUHZ-ZRP100, PUHZ-ZRP125
Cooling (*3) -15˚C to +46˚C -15˚C to +46˚C
Heating -11˚C to +21˚C -20˚C to +21˚C
(*3) The optional air protection guide is required where the ambient temperature is lower than -5˚C.
Connectable Lossnay unit and outdoor unit for each function
[RA (Return Air) temperature control]
Dx-coil unit GUG-01SL-E GUG-02SL-E GUG-03SL-E
Connectable
Lossnay unit
LGH-50RVX-E LGH-65RVX-E LGH-80RVX-E LGH-100RVX-E LGH-150RVX-E
LGH-150RVXT-E
LGH-200RVX-E
LGH-200RVXT-E LGH-250RVXT-E
Connectable
outdoor unit
PUHZ-ZRP35 PUHZ-ZRP35 PUHZ-ZRP50 PUHZ-ZRP71 PUHZ-ZRP100 PUHZ-ZRP100 PUHZ-ZRP125
[SA (Supply Air) temperature control]
Dx-coil unit GUG-02SL-E GUG-03SL-E
Connectable
Lossnay unit
LGH-80RVX-E LGH-100RVX-E LGH-150RVX-E
LGH-150RVXT-E
LGH-200RVX-E
LGH-200RVXT-E LGH-250RVXT-E
Connectable
outdoor unit
PUHZ-ZRP50 PUHZ-ZRP50 PUHZ-ZRP71 PUHZ-ZRP71 PUHZ-ZRP71
Note: GUG-01SL-E cannot be used for the SA temperature control function.

─6 ─
4. Outside dimensions
GUG-01SL-E, GUG-02SL-E
63
E
30
492
P
G
M
B
C
ijQ
ijR
F
HJ
551
A
D
115 186
55
L K
52
N
47
Air inlet from
Lossnay
Ceiling suspension fixture
Gas pipeijT
Liquid pipeijS
Maintenance cover for drain pump, inlet air
thermistor and water detecting sensor
Heat exchanger
Control box
150 to 200
Drain pump
Drain pipe (O.Dij32)
Inspection
opening
450 x 450 or
more
SA
(supply air)
(4-13 X 20 oval)
Power supply
cable opening
Maintenance cover for SA thermistor
(GUG-02SL-E only)
An inspection opening is required for installation
and regular maintenance (check) of the drain
pump. When SA temp. control is selected,
another inspection opening may be required in
front of the unit for SA thermistor replacement
only when an error occurred on the SA
thermistor.
Ceiling suspension fixture
Model A B C D E F G H J K L M N P Q R S T
GUG-01SL-E 811 812 330 147 593 520 146 200 41 77 100 166 44 85 208 192 6.35 12.7
GUG-02SL-E
1033 1034 394 170 600 750 132 250 59 56 165 207 86 84 258 242 9.52 15.88
Unit (mm)
GUG-03SL-E
63
217
518
1130
49
14 250
290
250 47
461
750329
750
1156
30
459
97
404
14
52
115
340
55
78
Air inlet from
Lossnay
Gas pipe ij15.88
Liquid pipe ij9.52
Maintenance covert for SA thermistor
Maintenance cover for drain pump, inlet air
thermistor and water detecting sensor
Heat exchanger
150 to 200
Control box
Drain pump
Drain pipe (O.D ij32)
Inspection
opening
450 x 450
or more
SA
(supply air)
(4-13 X 20 oval)
Power supply cable opening
An inspection opening is required for installation
and regular maintenance (check) of the drain
pump. When SA temp. control is selected,
another inspection opening may be required in
front of the unit for SA thermistor replacement
only when an error occurred on the SA
thermistor.
Ceiling suspension fixture
Ceiling suspension fixture
Unit (mm)

─7 ─
5. Electrical wiring diagram
GUG-01SL-E, GUG-02SL-E, GUG-03SL-E
SA thermistor
(For GUG-02-E and GUG-03SL-E)
Dedicated remote controller PZ-01RC
(Accessory)
To Lossnay
(CN20)
(RED)
(RED)
CN20:RED
CN23:BROWN
CN29:BLACK
CN22:BLUE
Others: WHITE
(RED)
(YELLOW)
(WHITE)
(WHITE)
(WHITE)
(GREEN)
To outdoor unit
CN105
LED1
S1 L
N
E
S2
S3
TB6
CN9
CN10
CN120
CN3
CN2CN4
CN6
CN5
CN1
SW11
TM104
LED12
LED11
SW1 SW6
TAB1
CN20
CN23 CN21 CN29
CN22 CN82
TH11
TH2
TH5
SW2
SW3
SW4
LED5
LED4
LED3
LED2
LED6
LED7
TH9
Printed circuit
board B
(PCB B)
(GU-01-E)
Printed circuit
board A
(PCB A)
(IF013)
TRANS
DRAIN
PUMP
WATER
SENSOR
* PZ-61DR-E cannot be connected.
Fuse 3.15 A 250 V
Fuse
5 A 250 V
Definition of symbols
Printed circuit board A Printed circuit board B
TB6 : Terminal for power supply from the outdoor unit TM104 : Terminal for remote controller PZ-01RC
TAB1 : Connector (Ground) SW11 : Switch (Function selection)
SW1 to SW4 : Switch (Function selection) LED11 : Inspection indicator lamp
SW6 : Switch (Function selection) LED12 : Power supply indicator lamp
LED1 : Power supply indicator lamp CN1 : Connector (Power supply)
LED2 to 5 : Operation status CN2 : Connector (Transformer primary)
LED6 and 7 : Reading/Writing data from/to SD card CN3 : Connector (Drain pump)
CN105 : Connector (Communication to PCB B) CN4 : Connector (Transformer secondary)
CN20 : Connector (TH1, software use) CN5 : Connector (Communication to PCB A)
CN21 : Connector (TH2, liquid pipe temp.) CN6 : Connector (Output to PCB A)
CN22 : Connector (Remote controller) CN9 : Connector (TH9, supply air temp.)
CN23 : Connector (TH11, inlet air temp.) CN10 : Connector (Water sensor)
CN29 : Connector (TH5, gas pipe temp.) CN120 : Connector (Communication to Lossnay)
CN82 : Connector (Forced comp. OFF) : Terminal block
: Terminal block : Connector on PCB
: Connector on PCB
Notes:
1. TB6, TM104 and CN120 shown in dotted lines are field work.
2. Make sure to connect the earth wire.
3. Cut off the power supply (all to the Dx-coil unit, Lossnay unit and outdoor unit) more than five minutes prior to access the electrical parts.
4. The product shall be installed in accordance with national wiring regulations.

─8 ─
Transmission cable
to PCB B: CN105
1Not used
2GND
35 VDC
4Pulse signal
5Pulse signal
Power supply cable connection terminal: TB6
SW4
SW3
SW2
SW1
Function selection
switch
Power supplied: Lit
Power NOT supplied: Unlit
SW6
Lot number and
software version
indication
Inlet air thermistor:
CN23
S1, S2, S3
Connection to Outdoor unit
Earth
connection
Upper Lower
N, L
Power supply to
CN1 on PCB B
[Note] The following connectors and terminals are not used.
(CN2P, CN2A, CNX1 to CNX8, CN100, CN101, CN28, CN53, CN108 (SD card slot), and TB63)
Power supply
indicator
(LED1 Orange)
LED5
LED4
LED3
LED2
Fuse
3.15 A/250 V
Earth connection
Input cable to
PCB B: CN20
Normal…2 to 3 VDC
Error…4 to 5 VDC or
0 to 1 VDC
Input cable to PCB B: CN22
(Remote controller transmission line)
11 to 13 VDC
Input cable to PCB B: CN82
While compressor can be ON …12 to 14 VDC
While compressor is forced to stop…0 to 1 VDC
LED6
LED7
Liquid pipe thermistor:
CN21
Gas pipe thermistor:
CN29
CNS2 13:
Short
6. Circuit board diagrams
Circuit board diagram and check points
(1)Printed circuit board A (PCB A): IF013

─9 ─
(2)Printed circuit board B (PCB B): GU-01-E
Function selection
and model selection
switch
Power supplied: Lit
Power NOT supplied: Unlit
Available for GUG-02SL-E
and GUG-03SL-E
PCB Lot number indication
12 VDC
(Insulated)
Power of PCB B
SW11
SA temperature
thermistor: CN9
Drain pump outlet:
CN3
220-240 V/50 Hz
220 V/60 Hz
Transmission cable
to Lossnay: CN120
1Not used
2GND
35 VDC
4Pulse signal
5Pulse signal
Water sensor: CN10
14 4 to 5 VDC
Remote controller
(PZ-01RC)
connection terminal
(from PCB A):
TM104
11 to 13 VDC
Transmission cable
to PCB A: CN5
1Not used
2GND
35 VDC
4Pulse signal
5Pulse signal
GND for PCB B
(Insulated)
5 VDC (Insulated)
Transformer primary
(input): CN2
220-240 V/50 Hz
220 V/60 Hz
Transformer
secondary
(output): CN4
12 to 17 VAC
Indication of the
microcomputer
software version
Power supply
indicator
( LED12 Red)
Error indicator
( LED11 Green)
Output cable to PCB A: CN6
12: CN20 on PCB A
Normal…2 to 3 VDC
Error…4 to 5 VDC or 0 to 1 VDC
34: CN82 on PCB A
Signal output to force compressor to be OFF
While compressor can be ON …12 to 14 VDC
While compressor is forced to stop…0 to 1 VDC
56: CN22 on PCB A (Remote controller transmission line)
11 to 13 VDC
Normal : Unlit
Error or starting up: Blinking
Fuse
5 A/250 V
(PCB A Power supply
output: TB6 N, L)
PCB B Power supply
input: CN1
220-240 V/50 Hz
220 V/60 Hz

─10 ─
7. Troubleshooting
Work precautions
• Before starting the service, the power supply isolator must be turned off. Pay sufficient attention to avoid
electric shock or injury.
• When removing or touching the cables, circuit boards or other parts, make sure to turn off the power supply
isolator.
• Even after the power supply isolator is turned off, the capacitor on the circuit board retains high voltage for a
while. Therefore, before servicing, wait for at least five minutes, and then use a tester to check that the volt-
age has dropped.
• Terminals of a large electrolytic capacitor in the power circuit section continues to generate low-voltage for
approximately one hour after the power shutdown. Therefore, handle the circuit board very carefully when
replacing it.
• Once the power supply is turned off, be sure to wait for at least five minutes before turning the power back
on again.
• When servicing, be sure to reproduce the malfunction two or three times before starting repairs.
• When servicing, always take care to keep proper footing.
• When removing the circuit board, always hold it at both ends and remove carefully so as not to apply force
to the surface mounted parts.
• When removing the circuit board, be careful of the metal edges on the board.
• When removing or inserting the connectors for the circuit board, hold the entire housing section. Never pull
on the lead wires.
• If it is thought that there is a circuit board malfunction, check for disconnected wires in the print pattern,
burnt parts or discoloration.
• If the circuit board is replaced, make sure that the switch settings on the new board are the same as the old
board.
• Make sure to connect the power supply wires correctly.
The part names in the texts are standardized with the part names in the parts catalog. (There are some
exceptions.)

─11 ─
Applicable Device Applicable Model Remote controller
Dx-coil unit GUG-01SL-E GUG-02SL-E GUG-03SL-E PZ-01RC
Connectable
Lossnay unit
LGH-50RVX-E
LGH-65RVX-E
LGH-80RVX-E
LGH-100RVX-E
LGH-150RVX-E, LGH-200RVX-E
LGH-150RVXT-E, LGH-200RVXT-E
LGH-250RVXT-E
PZ-61DR-E
No. Preliminary check item Details
1 Product information • Model name of the product
• Serial number of the product, manufacturing lot number of the circuit board
• Microcomputer software version marked on the circuit board
2 Fault status • Fault status (For example, the Dx-coil unit does not perform temperature
control.)
• Error code display on the remote controller
• Function setting of the remote controller (operation mode setting, fan speed
setting, etc.)
3Frequency of fault occur-
rence
• Frequency of fault occurrence (frequency of date and time of occurrence,
regularity of occurrence, etc.)
• Operating time up to fault occurrence
• Date of start of use, date of fault occurrence
4 Timing of fault occurrence • Remote controller operation performed before fault occurrence
• Operating status, etc.
5 System settings • Function selection switch settings of the product
• Model name and address setting of the remote controllers (PZ-01RC, PZ-
61DR-E, or system controllers).
• Function settings on PZ-61DR-E when PZ-61DR-E is used
6 System drawings • System Configuration
• Wiring
• Record of the function setting statuses
The system fails to start up.
The system fails to operate properly.
• An error code is displayed on the remote
controller.
• LEDs on the circuit boards blink.
7-2 Initial check items
7-4 The system fails to operate properly.
7-3 Error code and LED display
7-1 Service flowchart
After checking the check items below, follow the troubleshooting for servicing.
See the Lossnay service handbook for individual failures of the Lossnay units, and the outdoor unit service
handbook for failures of the outdoor units.

─12 ─
7-2 Initial check items
Check the following details if the system fails to operate properly after installation is completed.
(1) Power supply
No. Check Item Corrective action
1Is the main power supply of the outdoor unit and
Lossnay unit on?
Turn the main power supply on.
2 Is the current capacity of the power supply isolator
appropriate?
Use an appropriate power supply isolator.
3 Is the designated cable used for the power supply
cable?
Use the designated cable.
4 Are the cables correctly wired between the outdoor
unit and Dx-coil unit?
Carry out wiring correctly.
5 Is the specified power supply supplied to the power
supply terminal of the outdoor unit and Lossnay
unit?
Supply the designated power supply.
6 Is the power supply cable incorrectly wired, is there
a faulty connection or are screws loose?
Connect the cable securely and correctly, and
tighten the screws firmly.
7 Is there a faulty connection on the power supply
terminals (TB6: L and N) on PCB A?
Connect the lead wires securely.
8 Is there a faulty connection on the power supply
terminal (CN1) on PCB B?
Connect the lead wires securely.
9
Is there a faulty connection on the transformer termi-
nals (CN2 and CN4) on PCB B?
Connect the lead wires securely.
10 Are the following power supply indicator LEDs on the
circuit boards lit?
LED1 on PCB A (Dx-coil unit)
LED12 on PCB B (Dx-coil unit)
LED4 on the control circuit board (Lossnay unit)
Check the above items.
Cable diameter 0.75 mm2
Max. extension 45 m
Terminal block TB6 [S1] [S2] [S3] on PCB A of the Dx-coil unit
Table 1
Wiring specifications between the Dx-coil unit and outdoor unit

─13 ─
No. Check Item Corrective action
1 Are the designated cables used for the remote control-
ler transmission cable? (See Table 2.)
Use the designated transmission cables.
2 Is the Lossnay connecting cable securely connected? Connect the cable securely.
3 Are the remote controller transmission cables wired us-
ing other than 2-core cables?
Use the designated transmission cables.
4 Are multiple transmission cables wired in the same
cable duct?
Wire the transmission cable away from one
another.
5 Is the power supply cable wired at least 5 cm away
from transmission cables?
Wire the power supply cable at least 5 cm away
from the transmission cables.
6 Are the transmission cables connected to the desig-
nated terminal block? (See Table 2.)
Connect the transmission cables to the desig-
nated terminal blocks.
7 Are the transmission cables incorrectly wired, is there a
faulty connection or are screws loose?
Connect the cable securely and correctly, and
tighten the screws firmly.
8 Is the wiring length of the transmission cable within the
regulations? (See Table 2.)
Wire the cables within the regulations.
Remote controller PZ-01RC PZ-61DR-E
Type Sheathed cable Sheathed cable
Number of cores 2-core cable 2-core cable
Cable diameter 0.3 mm2(AWG22) 0.3 mm2(AWG22)
Total extension 200 m 200 m
Terminal block TM104 on PCB B of the Dx-coil unit TM4 12 on the control circuit
board of the Lossnay unit
(2) Transmission cables (Remote controller transmission cable, Lossnay connecting cable)
Table 2
Remote controller transmission cable specifications
(3) Function setting
No. Check Item Corrective action
1 Is the function selection switch (SW7-1:
Setting whether or not the Dx-coil unit is
connected) on the control circuit board set
correctly?
Check the function selection switch (SW7-1) on the control
circuit board of the Lossnay unit, or the function setting
(No. 71) of Lossnay remote controller (PZ-61DR-E).
2 Are the function selection switches on the
circuit boards set correctly to suit the re-
quired application?
Set the following function selection switches (DIP switches)
on the circuit boards correctly.
<Dx-coil unit>
SW1, SW2, SW3, SW4, SW6 on PCB A
SW11 on PCB B
<Lossnay unit>
SW2, SW5, SW6, SW7 on the control circuit board
3 Has a switch or a function been set although
it is not allowed to be set?
See the technical manual or installation instructions, or (6)
on page 14 to check if the setting is prohibited.
(4) System restrictions
Refer to the technical manual.

─14 ─
LED1
(Power for microcomputer)
Indicates whether control power is supplied to PCB A. Make sure that
this LED is always lit.
LED2
(Power for remote controller PZ-01RC)
Indicates whether power is supplied to the remote controller.
LED3
(Communication between PCB A and
outdoor unit)
Indicates state of communication between PCB A and outdoor unit.
Make sure that this LED is always blinking.
(5) LED Indications on PCB A of the Dx-coil unit
For description of each LED (LED1, 2, 3) provided on PCB A, refer to the following table.
If the lighting status of the above LEDs is improper, see (1) and (2).
(6) Setting of the DIP switches (function selection switches) on the circuit boards
The setting of the following DIP switches shall be as shown below (factory setting) and must not be changed.
Change of the setting inhibits the system from operating properly. When replacing the circuit boards, make
sure that the switch settings on the new board are the same as the old board. (All the switches on the service
circuit boards are set to OFF.)
Circuit board Switch No. Setting
PCB A of the Dx-coil unit SW1-2, SW1-3, SW1-6 Must be ON
SW1-1, SW1-4, SW1-5, SW1-8
SW2-6 to SW2-8
SW3-1 to SW3-3, and SW3-6 to SW3-8
SW4-1 to SW4-8
SW6-1, SW6-2
Must be OFF
PCB B of the Dx-coil unit SW11-4 to SW11-8 Must be OFF
Control circuit board of the Lossnay unit SW7-3 to SW7-10 Must be OFF

─15 ─
7-3 Error code and LED display
An error code displayed on the remote controller (PZ-01RC or PZ-61DR-E) or the M-NET system controllers,
and blinking or illumination of LED11 (green) on PCB B of the Dx-coil unit show the type of an error.
This system is comprised of each control circuit of the Dx-coil unit (PCB A and PCB B), Lossnay unit, and
outdoor unit. If an error occurs, an error code is displayed on the connected remote controller. However, error
codes to be displayed differ depending on error locations and the connected remote controllers.
• Dx-coil unit remote controller (PZ-01RC) uses two-digit codes to indicate errors detected on PCB A of the Dx-
coil unit or in the outdoor unit. Whatever error detected on PCB B of the Dx-coil unit or in the Lossnay unit is
displayed by the error code "P1."
• Lossnay remote controller (PZ-61DR-E) or M-NET system controllers use four-digit codes to indicate errors
detected on PCB B of the Dx-coil unit or in the Lossnay unit. Whatever error detected on PCB A of the Dx-
coil unit or in the outdoor unit is displayed by the error code "0206."
When Lossnay remote controller (PZ-61DR-E) or M-NET system controllers are not connected, error details
can be checked by LED11 (green) on PCB B of the Dx-coil unit.
No. Remote controller Error code Cause Corrective action
1 Error display on
PZ-01RC
Other than
"P1"
An error is detected on PCB
A of the Dx-coil unit or in the
Outdoor unit.
See (1).
"P1" An error is detected on PCB
B of the Dx-coil unit or in the
Lossnay unit.
When Lossnay remote controller (PZ-61DR-E)
or M-NET system controllers are used, check
an error code displayed on them. →See (3).
If none of them are used, check LED11 on
PCB B of the Dx-coil unit. →See (2).
2 Error display on
PZ-61DR-E and
M-NET system
controllers
"0206" An error is detected on PCB
A of the Dx-coil unit or in the
Outdoor unit.
Check an error code displayed on Dx-coil unit
remote controller (PZ-01RC).
If the error code "P1" is displayed, check cable
connection or power supply referring to the er-
ror code "0206" troubleshooting. →See (3).
Other than
"0206"
An error is detected on PCB
B of the Dx-coil unit or in the
Lossnay unit.
See (3).
No. 1. Error code displayed on Dx-coil unit remote controller (PZ-01RC)
Lossnay remote controller
PZ-61DR-E
Dx-coil unit remote controller
PZ-01RC
LossnayDx-coil unit
Mr. Slim
Outdoor unit
PCB A PCB B
M-NET
An error is detected
on PCB A of the
Dx-coil unit or in the
Outdoor unit.
Ļ
Displays the error
code "0206".
An error is detected on
PCB B of the Dx-coil
unit or in the Lossnay
unit.
Ļ
Displays an error code
other than "0206".
No. 2. Error code displayed on Lossnay remote controller (PZ-61DR-E) or the M-NET system controllers
Dx-coil unit remote controller
PZ-01RC
LossnayDx-coil unit
Mr. Slim
Outdoor unit
M-NET
PCB A PCB B
An error is detected
on PCB A of the
Dx-coil unit or in the
Outdoor unit.
Ļ
Displays an error code
other than "P1"
An error is detected
on PCB B of the
Dx-coil unit or in the
Lossnay unit.
Ļ
Displays the error
code "P1"
Note: Dx-coil unit remote controller (PZ-01RC) displays an error code as well as the case of No. 1.

─16 ─
Error code Symptom Cause Corrective action
P1 Errors detected
on PCB B of the
Dx-coil unit
Some error has occurred on PCB
B of the Dx-coil unit. (LED11 on
PCB B blinks.)
See (2).
Errors detected
in the Lossnay
unit
Some error has occurred in the
Lossnay unit.
(LED11 on PCB B blinks nine
times.)
See the Lossnay service handbook.
Faulty connection
of CN20 on PCB
A of the Dx-coil
unit
Faulty connection of connector
CN20 on PCB A of the Dx-coil unit
Check the connector connection of CN20
on PCB A.
A break or short in a lead wire for
connector CN20
Check the lead wires for connector CN20.
PCB B of the
Dx-coil unit is not
functioning.
Power is not supplied to PCB B of
the Dx-coil unit.
(LED12 on PCB B is unlit.)
• Check the connection of power terminal
TB6 (L and N) on PCB A.
• Check the connection of power supply
connector CN1 on PCB B.
• Check the connection of transformer con-
nectors CN2 and CN4 on PCB B.
Failure of the transformer for PCB
B of the Dx-coil unit.
(LED12 on PCB B is unlit.)
Measure the coil resistance of the trans-
former with a tester. If the breaking of the
coil is detected, replace the transformer.
Failure of PCB B of the Dx-coil
unit.
If no error is detected after checking the
above items, replace PCB B (GU-01-E).
Malfunction of
PCB A of the Dx-
coil unit
Failure of PCB A of the Dx-coil
unit.
When the lighting status of the LEDs on
PCB B is normal, and no error is detected
on CN20 connection and lead wires, re-
place PCB A (IF013).
(1) Error codes displayed on Dx-coil unit remote controller (PZ-01RC)
If an error code is displayed on Dx-coil unit remote controller (PZ-01RC), follow the flowchart below.
"P1" displayed on PZ-01RC? Refer to (1).
Refer to (3).
PZ-61DR-E is connected?
0206, 2600, 2601, 5109,
or 0900 displayed on PZ-61DR-E?
Refer to the service handbook
of the Lossnay unit for details.
No
Refer to (2).
No
No
Yes
Yes
Yes

─17 ─
Error code Symptom Cause Corrective action
P2 Liquid pipe ther-
mistor (TH2)
failure
Faulty connection of thermistor
connector CN21 on PCB A of the
Dx-coil unit
Check the connector connection of CN21
on PCB A.
A break or short in a lead wire for
thermistor (TH2)
Check the lead wires for thermistor (TH2).
Failure of thermistor (TH2) Measure the resistance of the thermistor
with a tester. If it differs significantly from
the following values, replace the thermistor
(TH2, TH5).
<Reference resistance values>
0°C: 15.0 kΩ, 10°C: 9.6 kΩ
20°C: 6.3 kΩ, 30°C: 4.3 kΩ
Refrigerant circuit defect or the
like is causing the rise or fall of a
sensed temperature of the ther-
mistor to 90°C or higher, or -40°C
or lower respectively.
Check the refrigerant circuit.
(For details, see the outdoor unit service
handbook.)
Failure of PCB A of the Dx-coil
unit.
If no error is detected after checking the
above items, replace PCB A (IF013).
P6 Freezing protec-
tion
Overheating
protection
No air is blown from the Lossnay
unit to the Dx-coil unit.
(Air volume is low).
Check that air is properly blown from the
Lossnay unit to the Dx-coil unit.
The air filter or Lossnay core of the
Lossnay unit is clogged.
Clean the air filter or Lossnay core.
The supply fan of the Lossnay unit
is not operating.
Check that the Lossnay unit is operating
properly. (For details, see the Lossnay
service handbook.)
Connector CN82 on PCB A of the
Dx-coil unit is disconnected.
Check the connector connection of CN82
on PCB A.
Connectors on PCB B of the Dx-
coil unit are disconnected.
Check all the connector connections on
PCB B.
PCB B of the Dx-coil unit is not
functioning properly.
• Check the lighting status of the LEDs on
PCB B.
(LED11: unlit, LED12: lit)
• Check LEDs on the control circuit board
of the Lossnay unit, or for any error code
displayed on the remote controllers in-
cluding PZ-61DR-E.
Outdoor unit is not operating prop-
erly.
Check that the outdoor unit is operating
properly. (For details, see the outdoor unit
service handbook.)
Overload operation of the outdoor
unit
Check if the outdoor unit is operating under
overload. (For details, see the outdoor unit
service handbook.)
Refrigerant piping defect Make sure that there is no problem in
refrigerant piping. (For details, see the
outdoor unit service handbook.)

─18 ─
Error code Symptom Cause Corrective action
P9 Gas pipe ther-
mistor (TH5)
failure
Faulty connection of thermistor
connector CN29 on PCB A of the
Dx-coil unit
Check the connector connection of CN29
on PCB A.
A break or short in a lead wire for
thermistor (TH5)
Check the lead wires for thermistor (TH5).
Failure of thermistor (TH5) Measure the resistance of the thermistor
with a tester. If it differs significantly from
the following values, replace the thermistor
(TH2, TH5).
<Reference resistance values>
0°C: 15.0 kΩ, 10°C: 9.6 kΩ
20°C: 6.3 kΩ, 30°C: 4.3 kΩ
Refrigerant circuit defect or the
like is causing the rise or fall of a
sensed temperature of the ther-
mistor to 90°C or higher, or -40°C
or lower respectively.
Check the refrigerant circuit.
(For details, see the outdoor unit service
handbook.)
Failure of PCB A of the Dx-coil unit If no error is detected after checking the
above items, replace PCB A (IF013).
E0 to E5 Communication
error between the
Dx-coil unit and
remote controller
(PZ-01RC)
Faulty connection of the remote
controller transmission cable
Check the connection of terminal block
TM104 on PCB B of the Dx-coil unit.
Faulty connection of connector
CN22 on PCB A or CN6 on PCB B
of the Dx-coil unit
Check the connector connection of CN22
on PCB A, or CN6 on PCB B.
Defective wiring of the remote
controller transmission cable
• Check the items described in 7-2 (2).
• If the error code display does not disap-
pear, investigate noise on the remote
controller transmission cable.
• If the problem cannot be solved after
checking the above items, replace PCB A
(IF013) of the Dx-coil unit, or the remote
controller (PZ-01RC).
Failure of remote controller (PZ-
01RC) (When the error code E1 or
E2 is displayed)
Replace the remote controller (PZ-01RC).
E6 and E7 Communication
error between the
Dx-coil unit and
outdoor unit
• Faulty connection of the outdoor
unit connecting cable
• Wrong wiring of the outdoor unit
connecting cable
Check the connection of power terminal
TB6 (S1, S2, and S3) on PCB A.
Defective wiring of the outdoor unit
connecting cable
• Check the items described in 7-2 (1).
• See the outdoor unit service handbook.
• If the problem cannot be solved after
checking the above items, replace PCB A
(IF013) of the Dx-coil unit, or the control
circuit board of the outdoor unit.
Fb Malfunction of
the circuit board
of the Dx-coil unit
Failure of PCB A of the Dx-coil
unit.
Replace PCB A (IF013) of the Dx-coil unit.
PL Refrigerant pip-
ing defect
An error has occurred in the refrig-
erant piping.
• Check the refrigerant piping.
• See the outdoor unit service handbook.

─19 ─
Error code Symptom Cause Corrective action
PU Inlet air thermis-
tor (TH11) failure
Faulty connection of thermistor
connector CN23 on PCB A of the
Dx-coil unit
Check the connector connection of CN23
on PCB A.
A break or short in a lead wire for
thermistor (TH11)
Check the lead wires for thermistor (TH11).
Failure of thermistor (TH11) Measure the resistance of the thermistor
with a tester. If it differs significantly from
the following values, replace the thermistor
(TH11).
<Reference resistance values>
0°C: 15.0 kΩ, 10°C: 9.6 kΩ
20°C: 6.3 kΩ, 30°C: 4.3 kΩ
Refrigerant circuit defect or the
like is causing the rise or fall of a
sensed temperature of the ther-
mistor to 90°C or higher, or -40°C
or lower respectively.
Check the refrigerant circuit.
(For details, see the outdoor unit service
handbook.)
Failure of PCB A of the Dx-coil unit If no error is detected after checking the
above items, replace PCB A (IF013).
Other
than the
above
System failure Some error has occurred on PCB
A of the Dx-coil unit, remote con-
troller (PZ-01RC), or in the outdoor
unit.
See the outdoor unit service handbook.

─20 ─
(2) LED display on PCB B of the Dx-coil unit
The LED blink interval is 0.25 seconds for both on and off. The display duration is approximately 7 seconds.
LED11
(green) Symptom Cause Corrective action
1 blink Temperature
control setting
error
(Only for
GUG-01SL-E)
The function selection switch (SW1-
7: Selecting of RA temp. control or
SA temp. control) on PCB A of the
Dx-coil unit is set to OFF "SA tem-
perature control."
Dx-coil unit GUG-01SL-E cannot be used
for SA temperature control.
Set the switch (SW1-7) to ON "RA tem-
perature control."
Model selection switches (SW11-9
and SW11-10) on PCB B are set
incorrectly after a replacement of the
circuit board.
Check the model selection switches
(SW11-9 and SW11-10) on PCB B of the
Dx-coil unit.
Dx-coil unit GUG-01SL-E cannot be used
for SA temperature control.
2 blinks Drain water
overflow
Drain pump drainage defect Check the operation of the drain pump
by using the drain pump test run switch
(SW11-1) on PCB B of the Dx-coil unit.
(Refer to "Test run" on page 10 of the Dx-
coil unit installation instructions.)
<If the drain pump fails to operate>
• Check the connector connection of CN3
on PCB B of the Dx-coil unit.
• Check an output voltage of the connec-
tor CN3 on PCB B. When the output
voltage is normal, replace the drain
pump assembly. If it is abnormal, check
the power supply voltage.
If the power supply voltage is abnormal,
correct the voltage. When the voltage is
normal, replace PCB B (GU-01-E).
<If drainage of drain pump is poor>
• Check if the drain pump and drain piping
are clogged.
• Check that raising of drain piping and its
gradient are correctly constructed.
If the problem cannot be solved after
checking the above items, replace the
drain pump assembly.
Water sensor detection defect • Stop and then operate the Dx-coil unit,
with the water sensor not submerged. If
the error occurs, replace the water sen-
sor.
• If the error still occurs even after the
replacement of the water sensor, replace
PCB B (GU-01-E) of the Dx-coil unit.
7 s
Error display example of LED11: Two blinks
0.25 s 0.25 s 0.25 s
ON
OFF