Sharp WH-237DP User manual

SHARP SERVICE MANUAL
ELECTRIC WATER HEATER
MODELS WH-237DP
WH-247D
SHARP CORPORATION
TABLE OF CONTENTS
PARTS IDENTIFICATION AND SPECIFIC INFORMATION ..............................................
EXTERNAL DIMENSION ...................................................................................................
CAUTION FOR USE ..........................................................................................................
HOW TO USE ....................................................................................................................
WIRING DIAGRAM ............................................................................................................
INSTALLATION ADVICE ....................................................................................................
ELECTRIC WIRE CONNECTIONS ....................................................................................
SHOWER SET ....................................................................................................................
REPLACING METHOD FOR MAIN PARTS .......................................................................
TROUBLESHOOTING .......................................................................................................
CIRCUIT DIAGRAM (PCB-A) .............................................................................................
SERVICE PARTS LIST .......................................................................................................
Page
2
3
3
4
5
5-8
8-10
10
11-16
17
18
19-21
In the interests of user-safety (Required by safety
regulations in some countries) the set should be restore
to its original condition and only parts identical to those
specified should be used.

2
PARTS IDENTIFICATION
SPECIFIC INFORMATION
Model
Rated voltage
Rated frequency
Power consumptions
Water supply system
Water temperature control
Minimum pressure
Maximum pressure
Product dimension (W x H x D)
Weight (kg)
IP number
WH-237DP WH-247D
Note : Temperature of inlet water is approximately 25oC and flow rate is 2.3 liters/min.
220
50
2.4
3,500
Single point
Electronic control automatic constant
temperature - approximately 32oC - 48oC
0.02 MPa (0.21 Bar)
0.34 MPa (3.39 Bar)
236 x 378 x 86
IP25
4,500
Main breaker
ELB lamp
Power lamp
Temperature control button
Power SW. button
Display
: 1 MPa (Megapascal) = 10.2 Kilograms/Square centimeter.
Power cord and ground wire
Control lamp
Shower head
Shower stand
Shower hose
Main water valve
Water volume knob
ELB button
Body
Breaker angle support

3
EXTERNAL DIMENSION
Front Side
(Unit in mm.) Fig. 1
236
378
84
1. Always turn off the main breaker before making any repairs to your electric water heater.
2. Do not install water valve or faucet at hot water outlet. (Fig. 2)
3. Do not spray water on this electric water heater or put water towels on it. (Fig. 3)
4. Do not cover the shower head with hands or towels or fold the shower hose. (Fig. 4)
CAUTION FOR USE
5. If you see the light within your house is flashing from time to time while showering due to irregularity of
electricity, the water temperature may change and this is not unusual.
6. When using other valves with the water heater (sharing the main water pipe), the water pressure will
be reduced and water will flow slowly, therefore the temperature will rise temporary before revert back.
This is not a heater malfunction. Please turn the water volume knob or press the temperature volume
button appropriately.
7. In the event of thunder and lightning storm, turn off the main breaker to prevent the damage that may
occur on this appliance.
8. Close supervision is necessary in order to check on the water temperature when used by children,
elderly, patients and disabled person.
9. In case of water outage, press the Power SW. button and check whether the power lamp (red) and
the ELB lamp indicator (green) are off (to avoid water automatically flowing when you are not in the
bathroom after tap water flow resumes).
10. While we using a product if that is stop working immediately as we do not know the cause, please
inform the SHARP service center for proceed to repair.
Water valve
Water outlet
Water inlet
Fig. 2 Fig. 3 Fig. 4

ADJUSTMENT WATER TEMPERATURE
1. Using the temperature control button.
1.1. The heater will automatically set the default temperature when starts. The factory value is 34oC
which can be modified according to user preferences by adjust the water temperature to the
desired temperature and lock the temperature by holding any of the temperature control button
for 3 seconds. The temperature indicator will flash 3 times.
* Do not set to high default temperature as children may turn on the heater by themselves and
get hurt.
1.2. Changing from the default temperature can simply be done by pressing the temperature control
button up and down to adjust the temperature according the preference, which can be set
between 32oC - 48oC. When pressed, the “beep” tone will be heard and the temperature will
change by a degree.
1.3. The temperature indicator displays the preset temperature.
1.4. The new temperature can be adjusted anytime. If you do not want to bath at the default
temperature, see section 1.2.
1.5. The heater will remember the preset temperature during the bath though the heater has been
turned off temporary. (The heater will revert back to the default temperature if it is off for more
than 2.5 minutes).
4
HOW TO USE
BEFORE USE
The installation work is to be done by the Authorized “SHARP” Dealer.
The electric home shower unit must earthed.
Special skill is required. Never try to repair the unit by yourself.
1. Open the main water valve from the home main water pipe.
2. Open the main breaker switch.
3. Push up ELB breaker to activate the heater electrical system.
4. Press the Power SW. button on the heater. Normal temperature water will flow and the ELB lamp
indicator (green) will illuminate.
5. Turn the water volume knob clockwise or counterclockwise to increase or decrease water from the
shower head (see the water volume knob detail in water temperature adjustment).
6. Press the temperature button to adjust the desired temperature. The power lamp (red) will be
illuminated and the warm water will flow from the shower head (see the detail in water temperature
adjustment).
7. After use, press the Power SW. button to shut the heater off and water will stop flowing and the
electricity will be cut. For the next use, just simply press the Power SW. button and the water will
flow at the prevailing volume and temperature.
Note : In case of electricity or tap water outage while using, always press the Power SW. button
before leaving the bathroom.
ELB lamp
Power lamp
ELB checker button
Control lamp
Temperature button

1.6. If the control lamp is orange means that the water temperature is automatically controlled.
Illuminated : The water temperature will be controlled at the preset level.
Flash : Water flows too much and the warm water temperature is out of control.
If the incoming water temperature upward then press the temperature button and the control
lamp will illuminate.
1.7. If the control lamp flash, the water volume knob should be reduced by turning the water volume
knob counterclockwise until the lamp stops flashing. (If the incoming water flows too much and
the warm water temperature is out of control then the control lamp will flash).
1.8. Bath a cold water by pressing the temperature button until the temperature is lower then 32oC.
The indicator will display OF and flashes 3 times. Press the temperature button again when
OF is flashing and OF (off) will stop flashing and the (orange) lamp will also be off.
5
WIRING DIAGRAM
2. Using the water volume knob.
Turn the button clockwise to increase water volume knob.
Turn the button counterclockwise to decrease volume.
3. Using the Power SW. button.
Press the button and the ELB lamp indicator will illuminate and water will flow from the shower
head, press the button again to turn off the heater.

6
Screw
Fig. 8
2.2. Removing the unit cover.
Remove the screw underneath the unit.
Open the cover by lifting from the bottom.
INSTALLATION ADVICE
1. BEFORE INSTALLATION
Please check water pressure before operating this unit.
Minimum water pressure : 0.02 MPa (0.21 Bar).
Maximum water pressure : 0.34 MPa (3.39 Bar).
Please follow the picture below to check water pressure. Water shall overflow at the end of the
tube within 2.3 meters above the faucet.
2. INSTALLATION THE UNIT
2.1. Preparing installation area.
The unit must be mounted to the wall in a vertical position only. (See in the picture)
Leave this unit away from the wall for both sides more than 200 millimeters.
About 2.3 meters
Fig. 5
Fig. 6
The minimum height of 1.50 meters to the lower edge of the unit must be observed.
Fig. 7
Over 1.50 meters

7
2.4. Assemble the cover with the heater.
Place the cover for the space palm to plug the wire pole the same place on the circuit.
Assemble the cover from the bottom of the heater and push tight on the top of cover.
Tighten screws to attach the cover with the heater to the same position.
Fig. 11
Fig. 10
Fig. 9
25 mm.
6 mm.
2.3. Mounting the unit to the wall.
Drill two 6 millimeters holes in the wall with approximately 25 millimeters in depth.
Install wall anchors into the holes.
Screw the top wall anchors, leave screw length around 8-10 millimeters and hang the unit on the
screw then marked the position in order to drill another 2 holes at the bottom, drill the holes and
install the rest of wall anchors then fasten all of 4 screws.
Fig. 12
Notification in connecting the shower hose.
Shower head
PCB control
Back cover
Wire connect
Put in
Pull
Joint
Shower hose
2.5. The shower assembly.
The joint the shower hose counterclockwise with the shower head.
Connect to the unit.
Connect to the shower head.

8
2.6. Installation the shower stand.
Ensure that the shower stand located in the level that the top part of the shower head is not
higher than the top part of the unit when hanging the shower head. (See in the picture)
The angle of shower head holder can adjust into 2 levels.
Fig. 13
3. PIPING INSTALLATION
1. Connection point between the unit and the water volume knob and twist the shower hose by
hands until it tight. Do not use any tools during assembly because it may cause the damage to
plastic components.
2. Tighten the connection into the thread located at the bottom of the water volume knob.
Force gauge do not exceed 40 kgf.cm.
3. Connect water inlet pipe and water outlet pipe as shown in the picture.
Fig. 14
Water inlet
Filter
O-ring
Main water valve
Use pipe at least 15 cm. in length
Shower head
O-ring fixer
Shower hose
Water volume knob

ELECTRIC WIRE CONNECTIONS
1. Be sure to cut off the main power supply switch every time before starting any electrical work
Use dual insulated wire with at least 4 square meters cross-section (WH-237DP).
Use dual insulated wire with at least 6 square meters cross-section (WH-247D).
Connect electric wire to the unit from the main switch board through the main breaker which is
located outside the bathroom. Wire connection must be permanent.
Fig. 15
Earth ground
Main breaker
Bathroom
2. Electric wire connection to the unit can be done by 2 methods. (as illustrated) Drill a small hole at the
rubber to insert the wire on side or at the rear of the unit.
Peel the wire and connect to the ELB checker by connecting the high voltage cable to the terminal “L”
and connect neutrons wire into the terminal “N”. Use screwdriver to tighten the wires. (Force gauge
approximately 12 kgf.cm). If the wires are connected into the wrong terminal, the unit will not work
properly. It may result in damage to the circuit or may cause danger to the user.
Connect the wire at rear of the unit.
Fig. 16
Connect the wire on side of the unit.
Fig. 17
(Force gauge 12 kgf.cm)
Ground wire
50 mm.
20 mm.
12 mm. 30 mm.
Ground wire Ground wire
9

10
3. The ground wire must be connected to grounding point on the unit.
Ground rod installation, select the area where moisture stored in the soil and away from flood area
with no sand or limestone.
The diameter of ground rod is not less than 16 millimeters and the length is not less than
240 centimeters.
Embed the ground rod at least 30 centimeters in depth from ground surface.
Grounding process.
4. Ground resistance must be less than 5 ohm.
5. After grounding process is completed, if ground resistance is higher than 5 ohm, additional ground
rod must be embedded. Leave the additional one away from the previous ground rod at least equal to
the length of ground rod. Connect them together in parallel.
SHOWER SET
Shower heads allow users to adjust into 3 types by simply twisting the shower head cover as show the
picture.
Tools for embedded
At least 30 cm.
Ground surface
Ground rod Fig. 18
Fig. 19
JET TYPE
SPRAY TYPE
COMFORT TYPE
Match the sign with
you designed type.
LEFT RIGHT

11
1. Remove the screw underneath the unit.
2. Open the cover by lifting from the bottom.
3. Disconnect the connecting wire for PCB from the PCB control.
4. Now the body is free.
REMOVE OF BODY
Fig. 21
Body
Screw
Back cover
REPLACING METHOD FOR MAIN PARTS
1. Turn out the joint body between the body with the shower hose manually. Never use other tools to
avoid breaking plastic parts.
REMOVE OF SHOWER HOSE
Fig. 20
Body
Shower hose

Guide pin
Body
Push SW. set
Screw
Micro SW.
Back cover
12
Fig. 22
Fig. 23
1. Remove the body in accordance with “REMOVE OF BODY”.
2. Remove 2 screws holding the push SW. set to the back cover.
3. Now the push SW. set is free.
REMOVE OF PUSH SWITCH SET
Body
Remove the guide pin
Flat screwdriver
1. Remove the body in accordance with “REMOVE OF BODY”.
2. Push the claws of the guide pin by flat screwdriver and remove the guide pin from the body.
3. Now the power SW. button is free.
REMOVE OF POWER SWITCH BUTTON
Power SW. button

13
1. Remove the body in accordance with “REMOVE OF BODY”.
2. Disconnect reed SW. lead wires from the PCB-1.
3. Remove 2 screws holding the reed SW. from the body valve.
4. Now the reed SW. is free.
Note : Tighten the mounting screws of the reed switch at the specified torque ; 3-4 kgf.cm.
REMOVE OF REED SWITCH
Fig. 25
Reed SW.
Screw
Body valve
Reed SW. lead wire
Fig. 24
REMOVE OF TRIAC
1. Remove the body in accordance with “REMOVE OF BODY”.
2. Disconnect 3 lead wires from the triac.
3. Remove 2 screws holding to the heater tank ass’y.
4. Now the triac is free.
Triac Heater tank
Screw
White lead wire
Breaker lead wire
Triac lead wire
Brown lead wire

14
1. Remove the triac in accordance with “REMOVE OF TRIAC”.
2. Remove the body valve ass’y and the water outlet in accordance with “REMOVE OF BODY VALVE
ASS’Y and WATER OUTLET”.
3. Remove the screw to L-Wire Earth from heater tank ass’y.
4. Remove the screw holding cable tie from the heater tank support.
5. Remove 2 screws holding triac lead wire (brown) and thermostat lead wire (yellow) to the
heater tank ass’y.
6. Remove 2 screws holding the thermostat to the heater tank ass’y.
7. Remove the thermistor ass’y from the heater tank ass’y.
8. Now the heater tank ass’y is free.
REMOVE OF HEATER TANK ASS’Y
Fig. 27
Back cover
Thermostat lead
wire yellow
Screw
Screw
L-wire earth
Lead wire brown
Lead wire yellow
Thermistor ass’y
Breaker lead
wire black
Triac lead wire brown
Screw Screw
Cable tie
Heater tank support
Heater tank
Thermostat
REMOVE OF BODY VALVE ASS’Y AND WATER OUTLET
1. Remove the body in accordance with “REMOVE OF BODY”.
2. Remove the reed SW. in accordance with “REMOVE OF REED SWITCH”.
3. Remove the push SW. set in accordance with “REMOVE OF PUSH SWITCH SET”.
4. Detach 2 clamping springs holding the body valve ass’y and the water outlet to the heater tank ass’y.
5. Remove 2 screws holding the body valve ass’y.
6. Remove 2 screws holding the water outlet.
7. Now the body valve ass’y and the
water outlet are free. Heater tank
Water outlet
Screw
Clamping spring
Body valve ass’y
Back cover
Screw Fig. 26

15
1. Remove the body in accordance with “REMOVE OF BODY”.
2. Pull out the connecting wire for PCB from the display board.
3. Remove 2 screws holding display board to digital key top.
4. Now the display board is free.
REMOVE OF DISPLAY BOARD
Fig. 29
1. Remove the body in accordance with “REMOVE OF BODY”.
2. Pull out all lead wires from the PCB control.
3. Remove 3 screws holding the PCB control.
4. Now the PCB control is free.
REMOVE OF PCB CONTROL
Fig. 28
Screw
Back cover
Digital key top
Body
Connecting wire for PCB
Screw
Display board
PCB control

16
Fig. 30
1. Remove the body in accordance with “REMOVE OF BODY”.
2. Remove split pin holding the breaker angle support to the breaker.
3. Remove 2 screws holding 2 breaker lead wires to the breaker.
4. Remove 2 screws holding the breaker to the back cover.
5. Now the breaker is free.
REMOVE OF BREAKER
Split pin
Breaker
Breaker lock
Back cover
Breaker angle support Screw
Breaker lead wire
Display shows and sounds short beep 10 times. Then the power lamp is not lights up, ELB lamp
is lights up.
Possible cause : The water is not supply or the water pressure is too low.
Display shows and sounds short beep 2 times, long beep 1 time and so on until 8 times.
Then the power lamp is not lights up, ELB lamp is lights up.
Possible cause : The water pressure is too low and the temperature is too high in the heater tank.
So that the thermostat is cut off.
Display shows and sounds long beep 5 times. Then the power lamp is not lights up, ELB lamp is
lights up.
Possible cause : The temperature is too high in the heater tank. So that thermostat is cutoff.
ERROR DISPLAY

17
TROUBLESHOOTING
Problem Possible cause Corrective action
Power switch button is defected. Check or replace the mechanical parts
in power switch button.
Check electrical leakage point from
any lead wire or replace the ELB
breaker.
Open main SW.
Reset thermostat.
Replace the reed SW.
Check or replace the body valve ass’y.
Replace PCB control.
Replace triac ass’y.
Replace the PCB control.
Replace the PCB control.
Replace the PCB control.
Check and clean the O-ring.
Check and clean the shower course.
Open main water valve to increase.
Open main water valve.
Open water volume.
Check or replace the mechanical parts
in power switch button.
ELB breaker is cut off or
defected.
Main SW. is closed.
Thermostat trip (Cut off).
Reed SW. is defected.
Body valve ass’y is defected.
PCB control is defected.
Triac ass’y is defected.
PCB control is defected.
PCB control is defected.
PCB control is defected.
O-ring is clogged.
Shower ass’y is clogged.
Main water valve is open too low.
Main water valve is closed.
Water volume is closed.
Power switch button is defected.
Water is not hot.
- ELB lamp is lights up.
- Power lamp is not lights up.
- Control lamp is not lights up.
Water is not hot.
- ELB lamp is not lights up.
- Power lamp is not lights up.
- Control lamp is not lights up.
Water is not hot.
- ELB lamp is lights up.
- Power lamp is lights up.
- Control lamp is blink or lights up.
Water is not hot.
- ELB lamp is lights up.
- Power lamp is lights up
- Control lamp is not lights up.
Press the Temp. control
button to high level water is
not hot.
Water flow out from shower
ass’y is too low.
Water is not flow out from
shower ass’y.

18
CIRCUIT DIAGRAM (PCB-A)

19
SERVICE PARTS LIST Model WH-237DP
REF. NO PARTS CODE DESCRIPTION Q’TY PRICE
(FEC)
PRINTING & PACKAGING MATERIAL
1-1 71P107 INSTRUCTION BOOK 1
1-2 71P100 SET PACKING CASE 1
1-3 71P101 CARTON BOX 1
1-4 71P102 NAME PLATE 1
1-5 71P104 WIRING DIAGRAM STICKER 1
1-6 71J105 LOWER PAD 1
1-7 71J106 UPPER PAD 1
MECHANICAL PARTS
2-1 71P200SET BODY SET 1
2-2 71M219 GUIDE PIN 2
2-3 71P212 POWER SW. BUTTON 1
2-4 71M307 GUIDE PIN SPRING 1
2-5 71P203 ELB KNOB 1
2-6 7N6182 BREAKER ANGLE SUPPORT 1
2-7 7N706 SPLIT PIN 1
2-8 71J214 BREAKER LOCK 2
2-9 7A220 CLAMPING SPRING 2
2-10 7K102 WATER OUTLET 1
2-11 7D9241 PLUG 2
2-12 71J201 BACK COVER 1
2-13 7D601 AC LINE CLAMP 1
2-14 7N608 RUBBER CAP 1
2-15 71M216SET PUSH SWITCH SET 1
2-16 71M410ASY BODY VALVE ASS’Y 1
2-17 71J305 HEATER TANK SUPPORT 1
2-18 71M301SET HEATER TANK SET 1
2-19 71J306 CABLE TIES 1
2-20 71C204ASY SHOWER ASS’Y 1
2-21 7A9012ASY SHOWER HOSE ASS’Y 1
2-22 7A910 SHOWER STAND 1
2-23 7G801ASY WATER INLET BODYASS’Y 1
2-24 7A912 O-RING FIXER 1
ELECTRIC PARTS
3-1 7A605 BREAKER 220V, 30A 1
3-2 7H625 PCB CONTROL 1
3-3 7H630 CONNECTING WIRE FOR PCB 1
3-4 7U626 DISPLAY BOARD 1
3-5 71M411 BREAKER LEAD WIRE BLACK 1
3-6 7D2101 MICRO SWITCH 1
3-7 7R405 REED SWITCH ASS’Y 1
3-8 71P412 LEAD WIRE FOR PCB - A CN3 1
3-9 71J407 TRIAC LEAD WIRE BROWN 1
3-10 7R128ASY THERMISTOR ASS’Y 1
3-11 7N1261 THERMOSTAT 85oC1
3-12 71M410 THERMOSTAT LEAD WIRE YELLOW 1
3-13 7G127ASY TRIAC ASS’Y 600V, 25A 1
3-14 7N509 LEAD WIRE EARTH 1

20
Model WH-247D
REF. NO PARTS CODE DESCRIPTION Q’TY PRICE
(FEC)
PRINTING & PACKAGING MATERIAL
1-1 71P107 INSTRUCTION BOOK 1
1-2 71R100 SET PACKING CASE 1
1-3 71R101 CARTON BOX 1
1-4 71R102 NAME PLATE 1
1-5 71P104 WIRING DIAGRAM STICKER 1
1-6 71J105 LOWER PAD 1
1-7 71J106 UPPER PAD 1
MECHANICAL PARTS
2-1 71R200SET BODY SET 1
2-2 71M219 GUIDE PIN 2
2-3 71M212 POWER SW. BUTTON 1
2-4 71M307 GUIDE PIN SPRING 1
2-5 71J203 ELB KNOB 1
2-6 7N6182 BREAKER ANGLE SUPPORT 1
2-7 7N706 SPLIT PIN 1
2-8 71J214 BREAKER LOCK 2
2-9 7A220 CLAMPING SPRING 2
2-10 7K102 WATER OUTLET 1
2-11 7D9241 PLUG 2
2-12 71J201 BACK COVER 1
2-13 7D601 AC LINE CLAMP 1
2-14 7N608 RUBBER CAP 1
2-15 71M216SET PUSH SWITCH SET 1
2-16 71M410ASY BODY VALVE ASS’Y 1
2-17 71J305 HEATER TANK SUPPORT 1
2-18 71N301SET HEATER TANK SET 1
2-19 71J306 CABLE TIES 1
2-20 71A204ASY SHOWER ASS’Y 1
2-21 7A901ASY SHOWER HOSE ASS’Y 1
2-22 7A910 SHOWER STAND 1
2-23 7G801ASY WATER INLET BODY ASS’Y 1
2-24 7A912 O-RING FIXER 1
ELECTRIC PARTS
3-1 7A605 BREAKER 220V, 30A 1
3-2 7J625 PCB CONTROL 1
3-3 7H630 CONNECTING WIRE FOR PCB 1
3-4 7U626 DISPLAY BOARD 1
3-5 71N411 BREAKER LEAD WIRE BLACK 1
3-6 7D2101 MICRO SWITCH 1
3-7 7R405 REED SWITCH ASS’Y 1
3-8 71R412 LEAD WIRE FOR PCB - ACN3 1
3-9 71K407 TRIAC LEAD WIRE BROWN 1
3-10 7R128ASY THERMISTOR ASS’Y 1
3-11 7N1261 THERMOSTAT 85oC1
3-12 71N410 THERMOSTAT LEAD WIRE YELLOW 1
3-13 7J127ASY TRIAC ASS’Y 600V, 25A 1
3-14 7P509 LEAD WIRE EARTH 1