Panasonic NC-HU301P User manual

Electric Thermo Pot
NC-HU301P
NC-HU401P
Service Manual
ORDER NO. PHAT080502C3
(Revision : Aug. 2010)
Specifications
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service
or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.
© Panasonic Home Appliances (Thailand) Co., Ltd. 2008.
All rights reserved. Unauthorized copying and distribution
is a violation of law.
Panasonic
Product Color
Noble Champaign(N), Silver White(SW)
Destination
Thailand, Taiwan, Hong Kong
Singapore, Malaysia, USA/Canada
Vietnam, Russia/Ukrain
Power Supply
Power Consumption
Capacity (approx.)
Weight (approx.)
Thermal regulation Boiling : Relay, Thyristor
Can rotate 360 ° with the power cord
157 ° C
Approx. 1 m
Electric pump
Push switch
3 minutes
1.5W (DC commulator motor)
Electronic lock system (Locked in 10 sec. after switching “Dispense”)
54ml/sec (Constant)
Boiling : Relay, Thyristor
Warming : Thyristor
Rotating base
Thermal fuse
Power cord
Hot water supply device specifications
Hot water supply method
Current volume adjustment range
Operation method
Pump-lock
Hot water pump
Additional function : Dechlorination, keep warm (98, 90, 80), Energy saving timer 4, 6, 8 and 10 hours),
Overheating protection, Citric acid cleaning.
Power consumption
Rated duration
Dimension (approx.) (W x D x H)
Rated
Taiwan
110V
925W
69W
120V
925W
83W
120V
925W
83W
220V
875W
112W
220V
875W
112W
18Wh
16Wh
3.0L
3.0kg
24.8 x 31.0 x 29.0
4.0L
3.2kg
24.8 x 31.0 x 33.9
10Wh
19Wh
17Wh
15Wh
220V
875W
112W
230V
955W
133W
220V
875W
112W
220V
875W
112W
240V
1040W
122W
110V
925W
69W
NC-HU301P NC-HU401P
USA/CND USA/CNDRUS/UKRSingaporeThailand VietnamHong Kong Taiwan MalaysiaHong Kong
Boiling
Keep Warm
Average power 98 C
consumption during
keep warm
Average power consumption per hour for keep warm status.
(Conditions : Room temperature, water temperature 20 with rated water volume)
(approx.)
°
90 C
°
80 C
°
C
°
WARNING

— 2 —
NC-HU301P, NC-HU401P
Contents
Page
1. Specifications.......................................................................................................................................................1
2. Cautions for safe repair work...............................................................................................................................2
3. Part Names and Operation ..................................................................................................................................3
4. Reassembling and Assembling Procedure ........................................................................................................20
5. Wiring diagram...................................................................................................................................................33
6. Parts location and parts list................................................................................................................................36
WARNING This indicates “the possibility of death or serious injury”.
CAUTION This indicates “the possibility of injury or property loss”.
This symbol indicates caution to be careful.
This symbol indicates compulsory action that must be followed.
1 Cautions for safe repair work
To prevent accidents during repair work, injury or property loss to the users, safety instructions are described
below.
Degree of loss or potential for injury is classified as follows.
Safety instructions are classified with symbols as below and explanations are described as follows.
(Below symbols are examples)
After the repair, replace the original wiring layout.
Otherwise the lead wires may contact any rotating parts or adjacent components causing
failure, electric shock or fire.
Be careful to avoid electric shock. Disconnect power plug while repairing.
Caution for
electric shock
During repair service with power on,
such as for voltage measurement, be
careful to avoid electric shock around
charged battery portion or lead wire ter-
minals.
Disconnect
power plug
Disassemble, assemble and replace
parts after disconnecting the power
source. Failure may cause electric
shock or injury.
Make sure to use specified parts.
Make sure to use specified parts if indicated with the symbol !in circuit diagram or parts list.
WARNING
Wear gloves while disassembling, replacing or assembling.
Make sure to wear gloves while power is on to avoid injury from sharp metal edges or
electric shock during service work.
CAUTION

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NC-HU301P, NC-HU401P
2. Part Names and Operation
Filter A set
• It may have come off from the bottom of the
container. Push it completely into the correct
position.
Operation panel
• If the protective film is still covering the surface of the operation
panel, peel it off before using the operation panel.
Lock Knob
Steam vent
Lid
Main unit
Handle
Container
Minimum water
level mark
Liquid crystal
display
Guage Cover
Rotating base (360 degrees)
• When rotating the pot, do not
allow the cord to wind around
the unit.
Water out pipe
cover
Red ball
• Water level indica-
tor cannot be seen
when water level is
above the guage
cover.
Plug complete
Power plug
Cord
Body plug
Diamond fluorine & charcoal Boiling
• The container fine particle of diamond and
ground charcoal are mixed into fluorine is
used. Color, taste and smell of the tea are
conspicuous.
Healthy tea course
• The hot water is alkalified to accelerate the
extraction of tea ingredient such as catechin

— 4 —
NC-HU301P, NC-HU401P
3. Problems Checking
Please follow check operating detail bellow, before start to check
the problems.
3.1. Thermo Pot Performance Test Mode
3.1.1 Boiling and keep warm test
How to operate
1. Pour water into the container. (up to white line)
2. Supply with electric power.
3. Press SELECT pad to set 98 keep warm.
LED symbol for this instruction show as below.
Instructions
1. Long boil/Reboil LED will be lighted and start to boil water.
(LED monitor will display temperature in every 5 degree)
2.
After 14 to 15 minutes, buzzer sounds 4 times, 98 KEEP
WARM LED will be lighted and change to keep warm state.
• If choose Keep Warm at 98, LCD monitor will be changed
to 98 from 100 in approx. 9 min.
• If choose Keep Warm at 98, LCD monitor will be changed
to 98 from 90 in approx. 3 min.
• If choose Keep Warm at 98, LCD monitor will be changed
to 98 from 80 in approx. 3 min.
• Temperature in LCD monitor changes in the sequence of
100 98 90 85.
3. Display of temperature and battery charge sign in LCD
monitor while cordless operation. (Involves approx. 10°C
difference. Below display is the case.)
4. Required time to change to warm keep temperature.
• 98 warm keep : Approx 2.5 to 3.5 min..
• 90 warm keep : Approx.2.5 to 4.5 hours.
• 80 warm keep : Approx. 4.0 to 6.0 hours.
Full of water (3.0L to 4.0L), room temperature 20°C
Lighted Blink
Approx. at 50°C
Approx. at 70°C
Approx. at 95°C
Cordless Dispense
Cordless Dispense
Energy Saving
temp.
temp.
Cleaning
Cleaning
Long Boil
Lock
Unlock
Timer
Energy Saving
Timer
Reboil
Long Boil
Reboil
Select
VIP Keep warm
Lock
Unlock
Select
VIP Keep warm
Healthy
Tea
Healthy
Tea
4 Speed
Dispenser
4 Speed
Dispenser

— 5 —
NC-HU301P, NC-HU401P
3.1.2. Reboiling and keep warm test
How to operate
1. Set Keep Warm.
2. Press LONG BOIL/REBOIL bad once or twice.
Operating details
If press LONG BOIL/REBOIL pad once.
1.
Long boil/Reboil LED will be lighted and start to boil water.
LCD monitor will display as picture below.
2. Buzzer sounds 4 times after approx. 1 min. and 98 Keep
Warm will lights on. LCD monitor will display as picture
below.
Operating details
If press LONG BOIL/REBOIL pad twice.
1. Long Boil.Reboil LED will be lighted and start to boil water.
LCD monitor will display as picture below
2. Buzzer sounds 4 times after approx. 7 minutes, and 98
Keep Warm will lights on. LCD monitor will display as
picture below.
Cordless Dispense
Cordless Dispense
Cleaning
Energy Saving
Timer
Long Boil
Reboil
Lock
Unlock
Select
VIP Keep warm
Healthy
Tea
4 Speed
Dispenser
temp.
Cleaning
Energy Saving
Timer
Long Boil
Reboil
Lock
Unlock
Select
VIP Keep warm
Healthy
Tea
4 Speed
Dispenser
temp.
Cordless Dispense
Cleaning
Energy Saving
Timer
Long Boil
Reboil
Lock
Unlock
Select
VIP Keep warm
Healthy
Tea
4 Speed
Dispenser
temp.
Cordless Dispense
Cleaning
Energy Saving
Timer
Long Boil
Reboil
Lock
Unlock
Select
VIP Keep warm
Healthy
Tea
4 Speed
Dispenser
temp.

— 6 —
NC-HU301P, NC-HU401P
3.1.3. Pour out test (Electric pump type)
How to operate
1. Pour hot water into Container.
2. Supply with electric power.
3. Press UNLOCK pad
4. Press Dispenser pad.
Operating details
1. If press UNLOCK pad then Dispenser pad, water will be
poured out from Dispensing Spout.
3.1.4. LCD monitor display test (All lighted)
How to operate
1. Pour water into the container. (In this time, Battery
Charge Sign should be erased. -> Method : Erase battery
charge sign by repeating water pouring.)
2. Press TIMER pad, LONG BOIL.REBOIL pad, all together,
and then supply electric power.
3.1.5. Pour out test (Cordless type)
How to operate
1. Pour hot water into Container
2. Supply with electric power.
3. Supply power until Level 3 battery charge sign will be
displayed
4. Disconnect power cord when Level 3 battery charge sign
is displayed.
5. Press LOCK UNLOCK pad.
6. Press Dispenser pad.
Operating detail
1. If press Dispenser pad, and then Dispenser pad, water
will be poured out from Dispensing Spout.
3.2. Relation of battery charging sing
and possible water pouring
volume (Reference only)
(Common for 3L and 4L types)
LCD display (charging sign) Possible water pouring volume
(Indicative)
Level 3 2000 to 3000ml (3.0L)
3000 to 3800ml (4.0L)
Level 2 750 to 2000ml (3.0L)
1500 to 2800ml (4.0L)
Level 1 0 to 750ml (3.0L)
0 to 1500ml (4.0L)
Possible continuous pouring volume when changed to
cordless from Warm Keep State.
Operating detail
1. LCD monitor will display as picture below.
- Battery charge sign of 3 levels and temperature displays
will be erased after 10 hours from power cord disconnection
by natural discharging.
- Possible pouring volume will be decreased after long time
use. ( a half after 5 years.)
Cordless Dispense
temp.
Cleaning
Energy Saving
Timer
Long Boil
Reboil
Lock
Unlock
Select
VIP Keep warm
Healthy
Tea
4 Speed
Dispenser

— 7 —
NC-HU301P, NC-HU401P
3.3. Relation of elapsed time and possible water pouring volume (Reference only)
After 1h
3.0L hour
4.25h 7h 9.75hr After 1h 4.25h 7h 9.75hr
4.0 L hour
Possible continuous pouring volume when changed to cordless from Warm Keep State.

— 8 —
NC-HU301P, NC-HU401P
3.4 Check points
3.4.1. Picture is the case of 3.0L
To peg frame
Electric pump
Turn the power on press
the Lock/Unlock key for
unlocking, for unlocking,
press the Pour Out key to
on, and confirm the motor
rotating sound.
Red
White
Blue
Orange
Red
Red
Red
Thermal fuse (Completed)
(Between -: 0Ω)
Boiling heater
(Between - • Orange
Approx.58 Ω)
Keep warm heater
(Between -•
Orange Approx.432 Ω)
Lead wire E
(Completed)
(0 Ω)
Thermistor (Completed)
Approx. 20°C
Approx 45k Ω
Blue
1 3
2 3
5
123
4
4
5

— 9 —
NC-HU301P, NC-HU401P
3.4.2. List of lead wire color HU all series
Thermal fuse comp.
Lead wire A
Series SU1/HU1/MU1 HU1P(HK) HU1P(TWN) HU2/MU2 HU1P(USA) HU1P(RUS/UKR)
HU301P
White
HU1P(RUS/UKR)
HU301P
Red
HU1P(RUS/UKR)
HU301P
Red
HU1P(RUS/UKR)
HU301P
Red
HU1P(RUS/UKR)
HU301P
Orange
HU1P(RUS/UKR)
HU301P
Blue
HU1P(RUS/UKR)
HU301P
Blue
HU1P(RUS/UKR)
HU301P
Blue
Model
SU221 SU301 SU401 HU301P HU401P HU301P HU401P HU222 HU302 MU402 HU301P HU401P
White White White White White White White Yellow Yellow Yellow White/Black White/Black
Lead wire B
Series SU1/HU1/MU1 HU1P(HK) HU1P(TWN) HU2/MU2 HU1P(USA)
Model
SU221 SU301 SU401 HU301P HU401P HU301P HU401P HU222 HU302 MU402 HU301P HU401P
Blue Red Black Red Black Red Black Blue White Black White/Red White/Black
Lead wire S
Series SU1/HU1/MU1 HU1P(HK) HU1P(TWN) HU2/MU2 HU1P(USA)
Model
SU221 SU301 SU401 HU301P HU401P HU301P HU401P HU222 HU302 MU402 HU301P HU401P
Orange Orange Orange Blue Blue Black Black Blue Blue Blue White/Red White/Red
Lead wire ass’y D
Lead wire D
Series SU1/HU1/MU1 HU1P(HK) HU1P(TWN) HU2/MU2 HU1P(USA)
Model
SU221 SU301 SU401 HU301P HU401P HU301P HU401P HU222 HU302 MU402 HU301P HU401P
Orange Black White Blue Red Black White Yellow Blue Red White/Black White/Blue
Thermistor ass’y
Lead wire M
Series SU1/HU1/MU1 HU1P(HK) HU1P(TWN) HU2/MU2 HU1P(USA)
Model
SU221 SU301 SU401 HU301P HU401P HU301P HU401P HU222 HU302 MU402 HU301P HU401P
Black Red Blue Red Blue Red Blue Black Red Blue White/Red White/Blue
Lead wire ass’y H
Lead wire H
Series SU1/HU1/MU1 HU1P(HK) HU1P(TWN) HU2/MU2 HU1P(USA)
Model
SU221 SU301 SU401 HU301P HU401P HU301P HU401P HU222 HU302 MU402 HU301P HU401P
Orange Orange Orange Blue Blue Orange Orange Red Red Red White/Blue White/Blue
Lead wire J
Series SU1/HU1/MU1 HU1P(HK) HU1P(TWN) HU2/MU2 HU1P(USA)
Model
SU221 SU301 SU401 HU301P HU401P HU301P HU401P HU222 HU302 MU402 HU301P HU401P
Blue Red Black Red Black Red Black Blue Red Black White/Brown White/Yellow
Lead wire K
Series SU1/HU1/MU1 HU1P(HK) HU1P(TWN) HU2/MU2 HU1P(USA)
Model
SU221 SU301 SU401 HU301P HU401P HU301P HU401P HU222 HU302 MU402 HU301P HU401P
Yellow Orange Brown Orange Brown Orange Brown Yellow Orange Brown White/Orange White/Orange

— 10 —
NC-HU301P, NC-HU401P
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Thermal fuse Comp. Is there connection between the white lead wire on the peg
frame and the CN3 connector of the control unit A? (0Ω)
Replace the Thermal fuse
comp.
Keep warm heater Is there connection between yellow lead wire on heater
terminal and blue and orange led wires? (Approx.133Ω)
Replace the Container comp.
Power cord Is there connection in the power cord? (0Ω) Replace the Power cord.
Lead wire assy. E Is there connection in the lead wire assy. E? (0Ω) Replace the Lead wire assy. E.
AtinulortnoCehtecalpeR.lamronerastrapevobaehtn
ehW
comp. (operation)
BtinulortnoCehtecalpeR.lamronerastrapevobaehtnehW
comp. (bottom)
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Boiling heater Is there connection between yellow lead wire and blue •
orange lead wire? (11Ω)
Replace the Container comp.
At
inulortnoCehtecalpeR.lamronerastrapevobaehtnehW
comp. (operation)
BtinulortnoCehtecalpeR.lamronerastrap
evobaehtnehW
comp. (bottom)
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Is the filter (located at the bottom of the container) clogged? Clean up or replace the filter.
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ehtsserpdnaretawylppuS?e
disniretawerehtsI
Long Boil/Reboil pad.
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Themistor assy. comp. Is there connection between blue lead wire and blue lead
wire? (Approx. 45Ωwhen approx. 20°C)
Replace the Thermistor assy.
comp.
BtinulortnoCehtecalpeR.lamronerastrape
vobaehtnehW
comp. (bottom)
AtinulortnoCehtecalpeR.lamronerastrapevobaehtnehW
comp. (operation)
3.5. Failure Diagnostics Chart
3.5.1. No power (No indication, no pouring)
The items in the Check correspond to those shown in Check Point on P.9.
3.5.2. Water is not boiled. (Water pours out)
The items in the Check correspond to those shown in Check Point on P.9.
3.5.3 Hot water cannot poured out or water flow is obstructed. (Water is boiled)
Check point
The items in the Check correspond to those shown in Check Point on P.9.
3.5.4. Long Boil/Reboil LED and 98 keep warm LED are lighted up alternately.
(Overheating protection mode/Bottom thermistor disconnection mode)
Check point
The items in the Check correspond to those shown in Check Point on P.9.
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Electric pump Turn the 100V power on, and pres the Lock/Unlock pad rst
and then the Pour Out pad. Is the motor heard running?
Replace the electric pump.
Lead wire assy. E comp. Is there connection in the Lead wire assy. E? (0Ω) Replace the Lead wire assy. E.
AtinulortnoCehtecalpeR.lamronerastrapevobaehtnehW
(operation).
Bt
inulortnoCehtecalpeR.lamronerastrapevobaehtnehW
(bottom).

— 11 —
NC-HU301P, NC-HU401P
3.5.5. Long Boil/Reboil LED and 98 keep warm LED are lighted up alternately. (LCD display : H1)
The items in the Check correspond to those shown in Check Point on P.9.
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Themistor assy. comp. LCD display : H1 : Disconnection of Thermistor comp.) Replace Thermistor assy. comp.
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BtinulortnoCehtecalpeR--
comp. (bottom)
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itsongaiDkcehC
Lead wire E comp. Is there connection of Lead wire (0Ω.pmocEeriwdaeLehtecalpeR)
BtinulortnoCehtecalpeR.lamronerastrapevobaeht
nehW
comp. (bottom)
AtinulortnoCehtecalpeR.lamronerastrapevobaehtnehW
comp. (operation)
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dicacir
tichtiwhsaW--
noitcAdohtemcitsongaiDkcehC
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Is the filter set A (located at the bottom of the container) clogged?
Clean up or replace the filter set
A.
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)doht
empmupriA(nikcehc-eR)deruoP(?detcennocsielbacrewopnehwderuopretawtohehtsI
When the above parts are
normal.
AtinulortnoCehtecalpeR-
(operation).
When the above parts are
normal.
BtinulortnoCehtecalpeR-
(bottom).
3.5.6.Select pad doesn’t work.
3.5.7. Lock/Unlock pad doesn’t work.
The items in the Check correspond to those shown in Check Point on P.9.
3.5.8 Hot water cannot be poured out smoothly. Noise is getting big while operating and
noisy. The Container is dirty with water stain.
3.5.9 Hot water cannot be poured or not poured out smoothly. (Air pump method)
Check point
The items in the Check correspond to those shown in Check Point on P.9.

— 12 —
NC-HU301P, NC-HU401P
3.6. Operating and LCD Monitor Display Example
3.6.1. Boiling (If select keep warm at 98)
Power ON (Boiling)
Press Select pad to 98
(Long Boil/Reboil LED:Lighted)
Boiling detection after 2 minutes
(Long Boil/Reboiling & Reboil LED : Off)
Detection of boiling. After approx. 9 minutes.
3.6.2 Boiling (If select keep warm at 90)
Power ON (Boiling)
(Long Boil/Reboil LED : Lighted)
Boiling detection after 2 minutes
(Long Boil/Reboiling & Reboil LED : Off)
After approx.
2.5 to 4.5 hours.
Detection of boiling. After approx. 9 minutes.

— 13 —
NC-HU301P, NC-HU401P
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3.6.3. Boiling (IF specify Long Boil)
Power ON (Boiling)
(Long Boil/Reboil LED : Lighted) (Long Boil/Reboil LED : Blink)
Boiling detection after 2 minutes
(Long Boil/Reboil LED : OFF)
Press Long Boil/Reboil
pad 1 time
Extend boiling approx.
6 minutes
Detection of boiling.
3.6.4 Keep warm (When want to reboil from 90 Keep warm)
Press Long Boil/Reboil
noitcetedgnilioBemit1dap
(Long Boil/Reboil LED : Lighted)
Boiling detection after 2 minutes
(Long Boil/Reboil LED : OFF)
after approx. 2.5 to 5
minutes
After 3 minutes.

— 14 —
NC-HU301P, NC-HU401P
3.6.5. Keep warm (When want to reboil from 90 Keep warm)
(Long Boil/Reboil LED : Blink)
Boiling detection after 2 minutes
(Long Boil/Reboil LED : OFF)
Press Long Boil/Reboil
pad 2 times
Extend boiling approx.
6 minutes
Boiling detection after
2.5 to 5 minutes
After 3 minutes.
After approx.
2.5 to 4.5 hours
If the water is added, check the Long Boil/Reboil LED lighted on. If does not light on, press the Long Boil/Reboil LED.
There may be not start boiling automatically.
In this case, switches to Keep warm after once boiled. (Measure for unwanted bacteria)
Initial setting of Keep warm is 90 when power on.
3.6.6. Cleaning (When cleaning with citric acid from the water)
(Long Boil.Reboil LED : Lighted)
(Rotating Cleaning sign lighted)
Keep warm LED, 8sign and
sign blink at the same time
When power ON.
(Long Boil/Reboil LED : Lighted)
Press Slect pad and
set to Cleaning
After approx. 31 to 32
min. from normal water
temperature.
3.6.7. Detection of Abnormal Operation
Themistor disconnection
(Long Boil/Reboiling, Keep
warmLEDs blink alternately.
No-water boiling or abnormal
temperature (Long Boil/Reboiling,
Keep warm LEDs blink alternately.

— 15 —
NC-HU301P, NC-HU401P
Power ON Boiling mode
(Heater turns off, no boiling)
(Long Boil/Reboiling LED : OFF)
Boiling mode
(Long Boil/Reboiling LED : Lighted)
Press Timer pad 4 times.
Displayed by the hour.
Remaining hour : 0
2 minutes after detection of boiling.
(Long Boil/Reboiling LED : OFF)
Detection of boiling
After approx.
3 minutes
After approx.
2.5 to 4.5 hours
3.6.8. Timer Mode (If 90 Keep warm)
3.6.9. Setting of Long Boil/Reboiling at Timer mode
(Heater turns off, no boiling)
(Long Boil/Reboiling LED : OFF)
(Long Boil/Reboiling LED : Blink)
(Starts boiling)
(Long Boil/Reboiling LED : blink)
Press Timer pad 2 times
Press Long Boil/Reboiling
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2 minutes after detection of boiling.
(Long Boil/Reboiling LED : OFF) (Long Boil/Reboiling LED : OFF)
Approx. 6 minutes
extension of boiling.
After approx.
3 minutes

— 16 —
NC-HU301P, NC-HU401P
3.6.10. If Automatic keep warm (If 98 Keep warm)
(Long Boil/Reboiling LED : OFF) (Long Boil/Reboiling LED : OFF)
(Long Boil/Reboiling LED : OFF)
Unused hours Come at set temperature
(No boiling)
If temperature setting of 90 or 80, it switches to Keep warm when reaches at 90 or 80 simultaneously without boiling.

— 17 —
NC-HU301P, NC-HU401P
3.7. About “Automatic saving” function
• This unit remembers the daily use pattern, the hours this unit is used or not, after the power is supplied at first.
Refer to P.18 for the storage of the use pattern, the hours this unit is used or not.
This is a function to save electric power costs automatically “by stopping the power supply while this unit is not used” and
“starts boiling and keep warm at the preset temperature while used hours” based on stored pattern if Timer pad is pressed 5
times.
3.7.1. Operation of “Automatic saving” function
If “Timer” pad is pressed 5 times, following will be performed.
“Automatic” is displayed on LCD, and performs either mode of “Unused hours” or “Used hours”.
3.7.1.1. If “Unused hours”
Stops power supply.
(Temperature starts to fall and keeps warm at this temperature.)
Display
“Keep warm” LED : OFF.
“Stand-by” is displayed in LCD.
(Long Boil/Reboiling LED : OFF)
[Automatic Stand-by]
Automatically switches based on stored use pattern.
3.7.1.2. If “Used hours”
Starts to boil, and keeps warm at set temperature.
Display
“Keep warm” LED : ON.
“Stand-by” is erased in LCD.
(Long Boil/Reboiling LED : OFF)
[Automatic Stand-by]
3.7.2. Features of this function
Point 1
Boiling will be started automatically at the “time for use” based on stored pattern while this function is activated.
Accordingly, if the power cord is connected to the socket branched from a same breaker connected to other equipment, and
the power is connected at the same time, the breaker may be tripped.
Point 2
Air pump method is available while this function is activated.
In this case, “Automatic” in LCD will be erased.
Point 3
Change of the keep warm temperature or timer can be set up even while this function is activated. If keep warm temperature
is set from “80” to “90”, or “90” to “98”, it is boiled until the temperature reaches to set temperature.
Boiling will be started at the time set by the timer function.
Point 4
While this function is activated, power will be cut off at the start of “Unused hours”, and the temperature falls
accordingly. This is not a failure of unit.
Please check the signs “Automatic” and “Stand-by” in LCD when the water temperature falls as the result of this function.

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NC-HU301P, NC-HU401P
3.7.3. Cancel of “Automatic Saving”
If “Timer” pad is pressed 5 times, following will be performed.
“Automatic” is displayed on LCD, and performs either mode of “Unused hours” or “Used hours”.
Operation :
Press “Automatic Saving/Timer” pad.
Display
“Automatic” on LCD is erased.
(Long Boil/Reboiling LED : OFF)
If the water temperature is low when this function is cancelled, re-boiling will be started.
3.7.3.1. If reset the stored use pattern
Stored use pattern will be erased if the power plug is disconnected and left for more than 10 hours.
3.7.4. About storage of use pattern (hours using this unit and unused hours)
• Storage of use pattern (learning function) of “Automatic Saving” is made in the following procedure.
This function split a day (24 hours) into 72 pieces of time, each piece is 20 minutes, and store the record of used or unused of
each peace. Judgment method in this unit whether used or unused is as follows.
Regarded as “Used”
If the hot water is dispensed.
Regarded as “Unused”
Other cases such as boiling, keep warm, power supply is stopped by timer function, power supply is stopped by disconnection
of power plug etc.
Storage (learning) of basic use pattern
Basic use pattern means the operation pattern (Automatic Saving) applied to the operation of the days after 2nd week from
the date of first power on.
After the first power on, used hour (1 piece) during 1 week (7 days) are accumulated and stored. After the data for 1 week
is stored, a same time in a day is used at least 1 time, such period of time is deemed “used”, and others are deemed “unused”.
After 2nd week, pot is operated based on this pattern.
After 3rd week, data in 2nd week is reflected and update the basic pattern to follow the variation of life pattern.

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NC-HU301P, NC-HU401P
means the pot is used in 20 minutes.
means the pot is not used in 20 minutes.
1 day, 24 hours (20 seconds, 72 parts)
20 minutes each unit (the unit storing the operation of pot) 1 part
Accumulated
used days
Accumulated
hours from power
on to the
7th day)
The part even one is found,
it is deemed as used time.
Operation of
the pot after
8th day
Water temperature
Used UsedUnused Unused Used Unused
Temperature falls while unused hours
Keep war 98 while used hours
Water feed Water feed
To be able to set Automatic Keep warm 90(setting 98) or 80. Automatic stand-by (Power supply is saved). However, at least Keep warm 60 is maintained. (*1) Automatic temperature adjustment (Main heater 30sec. ON, 15sec OFF.*2 Switches to when reached to 98°C (Does not boil.)
If water is filled, once boils (when water is filled).
Note) : Temperature graph above is reference only.
NC-HU301P, NC-HU401P
1

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NC-HU301P, NC-HU401P
4. Reassembling and Assembling Procedure
[Below figure shows the case]
Attention,
Please assemble in the reverse sequence referring to
Assembling points.
4.1. Bottom plate and Plug connector
1. Remove 2 Tapping screws.
2. Remove 2 Truss screw from Body
3. Remove 1 Tapping screw of Plug connector
4. Remove Plug connector and slide insulation sheet A comp.,
and then orange and white lead wires from the Plug connector.
5. Remove insulation sheet A comp. from orange
and white lead wires.
Caution
Be careful for injuries by the
end face of metal portions
while reassembling,
replacement and assembling.
Wear groves while working.
4x12 Tapping screw
Bottom plate
Truss screw
4x12 Tapping screw
Body
Plug connector
Fig-1
Sleeve