LG RC9055*P*Z User manual

HEAT PUMP DRYER
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE TROUBLE
CORRECTLY BEFORE OFFERING SERVICE.
MODEL : RC9055*P*Z (RH9051WH)
RC8055*P*Z (RH8051WH)
RC7055*P*Z (RH7050WH)

!
WARNING !
IMPOR
The information in this service maual is intended for use by individuals possessing adequate backgrounds
of electrical, electronic, and mechanical experience. Any attempt to repair a major appliance may result in
personal injury and property damage. The manufacturer or seller cannot be responsible for the
interpretation of this information, nor can it assume any liability in connection with its use.
To reduce the risk of injury to persons, follow all industry recommended safety procedures including the
use of long sleeved gloves and safety glasses.
could result in property damage, injury to persons or death.
RECONNECT ALL GROUNDING DEVICES
If grounding wires, screws, straps, clips, nuts, or washers used to complete a path to ground are
removed for service, they must be returned to their original position and properly fastened.
Electrostatic Discharge (ESD)
Sensitive Electronics
ESD problems are present everywhere. ESD may damage or weaken the electronic
control assembly. The new control assembly may appear to work well after repair is
finished, but failure may occur at a later date due to ESD stress.
એUse an anti-static wrist strap. Connect wrist strap to green ground connection point or unpainted
metal in the appliance.
- OR -
Touch your finger repeatedly to a green ground connection point or unpainted metal
in the appliance.
એBefore removing the part from its package, touch the anti-static bag to a green ground connection
point or unpainted metal in the appliance.
એ
Avoid touching electronic parts or terminal contacts; handle electronic control assembly by edges only.
એWhen repackaging failed electronic control assembly in anti-static bag, observe above instructions.
TANT SAFETY NOTICE
To avoid personal injury, , disconnect power before servicing this product. If electrical power is required
for diagnosis or test purposes, disconnect the power immediately after performing the necessary checks.
IMPORTANT
Failure to follow all of the safety warnings in this manual
2

CONTENTS
1.SPECIFICATIONS ...............................................................................................................4
2.FEATURES AND LOOK ....................................................................................................... 5
3.PART IDENTIFICATION ........................................................................................................ 6
4.PROGRAM CYCLE ............................................................................................................. 7
5.INSTALLATION INSTRUCTIONS ........................................................................................ 10
6.MAINTENANCE INSTRUCTIONS ...................................................................................... 13
7.COMPONENT TESTING TIPS ............................................................................................ 15
8.WIRING DIAGRAM ......................................................................................................... 18
9.TROUBLESHOOTING ....................................................................................................... 19
10. DIAGNOSTIC TEST......................................................................................................... 24
11. DISASSEMBLE INSTRUCTIONS ....................................................................................... 37
12. EXPLODED VIEW .......................................................................................................... 43
3

4
SPECIFICATIONS
1
ITEMS
RC9055*P*Z / RC8055*P*Z / RC7055*P*Z
RH9051WH / RH8051WH / RH7050WH
REMARK
DRYING TYPE
WEIGHT
DIMENSION
STANDARD DRYING CAPACITY
CONTROL TYPE
POWER SUPPLY
MOTOR
HEATER
COMPRESSOR
LED LAMP
DOOR SWITCH
THERMOSTAT
DRUM VOLUME
Micom electronic Control
1. Pipe Temperature:2 thermistors (Eva in and Comp out)
2. Drum Temperature:1 thermistor
3. Main Heater : 1 thermistor
4. Humidity : Electrode sensor
5. Filter Sensing : Magnet , Reed switch
6. Sump water Sensing : Electrode sensor
Removable
52~53 rpm
Stainless steel
Available
Running status indicator (all)
Error display (all)
Condensation
Opaque : 56kg (Gross : 61kg)
Glass : 57kg (Gross : 62kg)
600(W) x 640(D) x 850(H)
9.0kg / 8.0kg / 7.0kg
Electronic Control
AC230V, 50Hz(16A)
210W
1000W
690W
DC12V (30mA)
250V(5A)
240V(25A)
121 Liter
Over current protect (Motor)
Over Load Protect (Compressor)
Thermostat
P/N:LPLN7269
Dafault : High
Dafault : Off
Dafault : Off
Maximum : 100 min
Minimum : 15 min
3~19 hours
SAFETY DEVICES
SENSOR
FILTER
DRUM SPEED
DRUM
DRYER RACK
CHILD LOCK
BUZZER
ANTI-CREASE
FAVORITE
(MORE)
(LESS)
TIME DELAY
DRUM INTERIOR LIGHT
LED DISPLAY

5
Energy
save
1%
---
Cycle selector
Start/PausePower
Additional
program
Eco Hybrid
Option
Dry Level
(*Child Lock)
Options
Time Delay
Anti-Crease
Favorite
Buzzer
SmartDiagnosis function is
available only for the products
with a SmartDiagnosis mark.
Drum Light
TM
TM
Control Panel
FEATURES AND LOOK
2
Ultra big Capacity Drum
Lower Energy Consumption
Reduced Drying Times
Reduced noise levels
Easy of Use
The ultra big 9.0kg capacity drum on this LG dryer allows you to
dry more washing at once, saving time!
LG Heat pump dryers use less energy than conventional dryers due
to optimized heat exechanger and auto cleaningTM technology.
This LG Heat pump dryer has been designed to save your money.
Drying times are now shorter due to Hybrid heating system
and optimized heat exechanger on this LG dryer.
We have reduced the operating noise of this LG dryer by using
innovative sound-absorbing and noise-screening technologies,
making it much quieter than conventional dryers.
The wide, electronically controlled LCD display on this machine
is very easy to use. Simply select the cycle you require
and your LG dryer will do the rest.
SmartDiagnosis is available by a Phone.

PART IDENTIFICATION
3
1. Drain Hose Assembly ( Purchased Seperately )
P/No. : 5001EL2001A P/No. : 3751EL1002C
2. Dryer Rack Assembly
3. Stacking kit Assembly ( Purchased Seperately)
Accessory parts
6
Holder : 2EA, Screw : 4EA
Purchased Separately
Product Layout
RC*055*PZ / RC*055*P2Z / RC*055*P3Z
RH9051WH / RH8051WH
RC*055*P1Z / RH7050WH
Water Container
Control Panel
Air Ventilation Grill
Opaque DoorGlass Door

PROGRAM CYCLE
4
7
Time Delay
You can use the Time Delay option to delay
the finishing time of drying cycle. Maximum
Time Delay is 19 hours.
Minimum Time Delay is 3 hours.
1. Turn the dryer on.
2. Select a cycle.
3. Set time delay hour by press the
“”, “ ” button.
4. Press Start/Pause button.
Anti-Crease
The Anti-Crease option prevents creases
that are formed when the laundry is not
unloaded promptly at the end of the drying
cycle. When Anti Crease is selected, the
dryer repeatedly runs and pauses, giving
you 2 hours to unload the laundry. If the
door is opened during the Anti-Crease
option, the option is cancelled.
Favorite
Favorite option allows you to store a
customized dry cycle for future use.
1. Turn the dryer on.
2. Select a cycle.
3. Select the option or additional program.
(Anti-Crease, Eco Hybrid
TM
etc.)
4. Press and hold Favorite option button for 3
seconds.
The Favorite option is now stored for future
use. To reuse the stored cycle, select
Favorite option and press the Start/Pause.
Drum Light
Whilst the dryer is running it is possible to see
inside the drum if you select the Drum Light
function.
Light on : Door is opened.
For 3 sec drum light button are
selected.
Light off : Door is closed. Off automatically.
Eco Hybrid
TM
This additional program is able to save
energy or time.
Eco: energy saving course. (Heat Pump only)
Hybrid: time saving course. (Heat Pump +
Heater) You will see “ speed ”
indication on the LED.
Note
Option
Hand Iron
This function remains more moist than the
condition for ironing.
Damp Dry Beep
This function lets you know when the clothes
are ready for ironing.
Cycle Dry Level
Iron Hand Iron
is available
Option
Cotton
Mixed Fabric
Easy care
Note
Cycle Dry Level
Extra
Very
Cupboard
Light
Damp Dry Beep
is available
Option
Cotton
Mixed Fabric
Easy care
Buzzer
This is a option to enable you to adjust
volume of beeper sound.
For the safety of your children, press Dry
Level button for about 3 seconds.
You will see “ ” indication on the LED.
You can see “ ” sign on LED window.
- All controls except Child Lock and Power
buttons will be disabled.
- Child Lock lasts after the end of cycle.
Child Lock ( & )
Note
For “Child Lock is off ”, press Dry Level
button for about 3 seconds.

PROGRAM CYCLE
4
8
Cycle Selection Table
CAUTION
If the load is less than 1kg, please use the “Warm Air” Cycle in Timed Drying Cycle.
Wool items should be dried using the “Wool” Cycle and heat-sensitive fabrics including silk, underwear and
lingerie should be dried using the “Delicate” Cycle. Please comply with the recommended laundry load when
you select your desired Cycle- found on page 19. Otherwise, your clothes may be damaged.
Sensor Dry Cycle
Cycle Laundry Type Detail
Drying Level
Timed Drying Cycle
Extra
Very
Cupboard
Light
Iron
Iron
Iron
-
-
-
-
-
-
-
-
-
-
-
Cupboard
Cupboard
Very
Towels, dressing gowns and bed
linen
For thick and quilted fabrics
Terry towels, tea towels, towels
and bed linen
For thick and quilted fabrics that do not need to be
ironed
Bath towels, tea towels,
underwear and cotton socks
For fabrics that do not need to be ironed
Sheets, pillowcase and towels
For fabrics that do not need to be ironed
Bed linen, table linen, towels,
T-shirts, polo shirts and work
clothes
For fabrics that do need to be ironed
Mixed Fabric
Bed linen, table linen, tracksuits,
anoraks and blankets
For thick and quilted fabrics that do not need to be
ironed
Shirts and blouses
For fabrics that do not need to be ironed
Trousers, dressers, skirts and
blouses
For fabrics that do need to be ironed
Tumbles without heat
All fabrics that need refreshing
Cool Air
T-shirts, pillowcase, and towels
Skin Care
Shirts and blouses
Refresh
(Refer to the Note)
For cotton fabrics which do not need to be ironed
Odor removal of fabric
(For fabrics in need of odor removal)
Bath towels, bath robes,
dishcloth and quilted fabrics
made of acrylic
Warm Air Small Items & damp clothing
Everyday items suitable for heat drying
Silk, wool, delicate lingerie
Rack Dry Refresh clothes without tumble drying
Shirts, T-shirts, trousers,
under-wear and socks
For polyamide, acrylic, and polyester that do not
need to be ironed
Easy care
Shirts, T-shirts, under-wear,
anoraks and socks
For polyamide, acrylic, polyester that do need to be
ironed
Soccer kit and training wear
Sports Wear For polyester material
Jeans and colour fading
garments.
Jeans For jeans which do not need to be ironed
Silk, fine fabrics and lingerie
Delicate For fabrics that are heat-sensitive like synthetic
fabrics
Wool
Wool For wool fabrics
Bed clothes, sheets
Bulky Item For bulky items
Linen and towels, excluding
fabrics applied to delicate, sports
wear, bulky Item cycle.
For small loads of suitable fabrics with short drying
times
Quick Dry
Cotton
Note
When using the “Refresh” course, please spray cold or warm water on the fabric for a fresher
outcome. (The recommend amount is 20cc of water per shirt.)

PROGRAM CYCLE
4
9

INSTALLATION INSTRUCTIONS
5
10
Level the Dryer
Adjustable Feet
Adjustable Feet Adjustable Feet
Dryer is loweredDryer is raised
1. Leveling the dryer prevents unnecessary noise
and vibration. Place your dryer on a solid,
level floor.
Leveling the dryer prevents unnecessary noise
and vibration. Place your dryer on a solid,
level floor.
2. If the dryer is not properly level, adjust the front
levelling feet as necessary.
Turn them clockwise to raise and
counter-clockwise to lower until the dryer no
longer wobbles, both front-to-back and
side-to-side.

INSTALLATION INSTRUCTIONS
5
11
Shape
and
assembly
direction
21.7 inch
(550mm)
Washer Top plate size
23.6 inch
(600mm)
Stacking Kit
In order to stack this dryer an LG stacking kit is
required.
This dryer may only be stacked on top of an LG
washer. DO NOT attempt to stack this dryer on any
other washer, as damage, injury or property damage
could result.
Installation Procedure
1. Place the LG dryer on the LG washing machine.
2. Remove the two screws from the bottom of the rear
cover on each side as illustrated below.
3. Align the stacking kit holes and the rear cover
holes.
3-1) 23.6 inch(600mm)
3-2) 21.7 inch(550mm)
• Fasten the 2 screws that were removed earlier
from dryer to stacking kit.
• Use 4 screws in accessory box [0.6inch(16mm)]
to assemble washer rear cover and stacking kit.
• The procedure for the opposite side will be the
same.
WARNING
•Incorrect installation can cause serious
accidents.
•The weight of the dryer and the height of
installation makes the stacking procedure
too risky for one person. This procedure
should be performed by 2 or more
experienced service personnel.
•The dryer is not suitable for a built-in
installation. Please do not install as a built-
in appliance.
•Do not operate if the dryer is disassembled.
Dryer
Washer

INSTALLATION INSTRUCTIONS
5
12

MAINTENANCE INSTRUCTIONS
6
1. Take
connecting
kit out.
Moisture Sensor?
The device senses the moisture level of the
laundry during operation, which means it must
be cleaned regularly to remove any build up of
lime scale on the surface of the sensor. Wipe
the sensors inside drum. (as illustrated)
2. Separate
water
container
hose from
the kit.
3. Connect
drain hose
to the kit.
Condensed Water Drain-out
Normally, condensed water is pumped up to the
water container where water is collected until
manually emptied. Water can also be drained
out directly to a mains drain, especially when the
dryer is stacked on top of a washing machine.
With a connecting kit for the mains drain hose,
simply change the water path and re-route to the
drainage facility as below:
Note
- Warm air is exhausted through the
ventilation grille.
- Adequate ventilation should be provided
to avoid the back flow of gases into the
room from units burning other fuels,
such as open fires.
Ventilation Grille and Cool Air
Inlet Grille
Vacuum the front ventilation grille 3-4 times a
year to make sure there is no build up of lint or
dirt that may cause improper air flow.
13

MAINTENANCE INSTRUCTIONS
6
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CAUTION
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14

COMPONENT TESTING TIPS
7
 
   ㎌±  ㎌
15

COMPONENT TESTING TIPS
7
Component Test procedure Check result Remark
The state that
knob is Pressed is
opposite to open
condition
Measure resistance of the
Following terminal
1) Door switch knob : open
Measure resistance of the
Following terminal
Measure resistance of the
Following terminal
Measure capacitance of
Terminal to terminal
2)Door switch Knob : close
DC 12V
Power on Check the
voltage in
terminal.
Measure resistance of the
Following terminal
Red housing
-.2wire (BL & RED)
Red housing
-.2wire (BL & RED)
8.LED Lamp.asm
9.Compressor set
10.OLP
11. Cooling fan
12. Comp capacitor
7. Door S/W
Resistance value < 1Ω
Resistance value ÷
Resistance value ÷
Resistance value < 1Ω
Terminal : “COM”- “NC”
(1-3)
Terminal : “COM”- “NO”
(1-2)
Terminal : “COM”- “NC”
(1-3)
Terminal : “COM”- “NO”
(1-2)
1
2
1
2
Measure resistance of the
Following terminal
1
2
Measure resistance of the
Following terminal
DC 12V
Start-up Voltage: Up 6V
Rate current: 0.5A + 10%
Locked current: Under 1A
Resistance value(
25
Resistance: 8.64 7%Ω
RED & BLUE
Resistance: 2.59 7%Ω
BL & RED
1
2
1
Resistance value
1
2
1
2
1
2
Terminal : “C”- “R” at 25
Terminal : “C”- “S” at 25
Measure resistance of the
Following terminal
1
Terminal : “1”- “3” at 25
Capacitance value : 35 1.75
Check resistance
Stanby condition : 11.5
Ω
(25 )
Comp operation condition :
35~38 Ω (25 )
1
2
16

COMPONENT TESTING TIPS
7
13.Steam generator Measure resistance of the
Terminal to terminal
Measure resistance of the
Following terminal
Measure resistance of the
Following terminal
White housing
-.2 wire (Two of five colors)
Measure resistance of the
Following terminal
Blue housing
-.2wire
Measure resistance of the
Following terminal
Measure resistance of the
Following terminal
14. Inlet. valve
15.Convert.valve
16.LID switch
17.Thermistor
(Comp out)
18.Thermistor
(Eva In)
Left picture
-.plate
White housing
-.2wire
Blue housing
-.2wire
17

WIRING DIAGRAM
8
18

TROUBLESHOOTING
9
 
 
   
   !
 "  #
$!   %&' 
(! '%) *%%   #*#
①1:HH ②18:d1(19:d1)
③1U:20 [ Main Version ::20 ]
④1d:09 [ Display Version ::09 ]
 
 "  + '% *
%* # &'!
+ , -$ . // -0!1 . +
,-# 2 //.
 "  #
$!   %&' 
(! '%) *%%   #*#
3 &
 "
&' '# &'!
&'  & &'%!
4%'% & &'%!
5 ' - $61 .
7+ , -$ . // -0!1 . +
,
7&'  -1 . 5 31-( .
11-%/ $&2 899.
$61-%/ $&2 899.
 "  #
$!   %&' 
(! '%) *%%   #*#
① 7 (( :&'  & &'; (( <=>
② 7 (( : 4%  & &'; (( <=>
③ 07 11 :5 ' ; 11 >
6 &
 "
&' ? % '# &'!
 & &'%!
# & &'%!
5 ' - @1 .
73& 2 %* '% ? 5 @1 -$ .
% 
 "  #
$!   %&' 
(! '%) *%%   #*#
① 7 (( : & &'; (( <=>
② 7 (( : # & &'; (( <=>
③ (7 3@ :&*)  *%% ; (3@ >
"%&)%''8/!
A  ' 2 *'%)  A $
? ? # ")
 % ? B%4 ? # ") 4 B# ' 
+
) ") 
-4 B# ' .
%% '%)
C* * &% '% &*!
C    % /#!
$!,%    -&%% 3 .
(! 4%4 ' (
3!&'  -/ (1 .
6! 4%4 ' $
1!&'  -/ (1 .
D) ")  '7 B *'%)
D,%  *  / 3  %* 3
&7

#   "  8 '&' '# &'!
8 '&'  -3 & 2 //.
 "  #
$! '%) *%%   #*#
C!0 E31 : % '&' + >
(!  " % +
1 &  "  B% '# &'!
7  B%  -F& //.
 "  #
$!   %&' //
(!  "   /% 
- %   /% '% .
F &
 "
%& #% '') 4%4 '# &'!
%& #   #%  *%%!
7%& 4%4 -( . //-$ .
 "  #
$! # //
(! * 899 * - / *  .
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TROUBLESHOOTING
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