Panasonic NC-BH30P-C, NC-BH40P-C Service Manual

Electric Thermo Pot

NC-BH30P-C
NC-BH40P-C

Service Manual

ORDER NO. PHAT070307C3

Specifi cations

Power Supply NC-BH30P NC-BH40P

Taiwan

Hong Kong

Thailand Vietnam Singapore Malaysia Taiwan

Hong Kong

Thailand Malaysia

110V 220V 220V 220V 230V 240V 110V 220V 220V 240V
Power Consumption
(approx.)

Rated 700W
Boiling 700W
Keep Warm 75W
Average power
consumption during
keep warm

98°C 27Wh 28Wh
90°C 22Wh 23Wh
80°C 19Wh 19Wh

60°C 13Wh 13Wh
Average power consumption per hour for keep warm status. (Conditions: Room
temperature, water temperature 20°C with rated water volume)

Capacity (approx.) 3.0L 4.0L
Dimensions (approx.) (W x D x H) 22.0 x 28.7 x 27.5 22.0 x 28.7 x 32.4
Weight (approx.) 2.2kg 2.4kg
Thermal regulation Boiling : Relay, thyristor

Warming : Thyristor

Sensor : Thermistor

Rotating base Can rotate 360° with the power cord
Thermal fuse 157°C
Power cord Approx. 1 m
Hot water supply device specifi cations
Hot water supply method Electric pump
Current volume adjustment range 54ml/sec (Constant)
Operation method Push switch
Pump-lock Electronic lock system (Locked in 10 sec. after switching “Dispense”)
Hot water pump Power consumption 1.5W (DC commutator motor)

Rated duration 3 minutes
Additional functions: Dechlorination, keep warm (98, 90, 80, 60), Energy saving timer 4, 6, 8 and 10 hours), Overheating protection,
Lock/Unlock pad, Citric acid cleaning

! WARNING

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.

© 2007 Panasonic Home Appliances (Thailand) Co., Ltd.
All rights reserved. Unauthorized copying and distribution
is a violation of law.

Panasonic

Product Color
Beige (C)
Destination
Thailand, Taiwan, Hong Kong, Singapore, Malaysia and Vietnam

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NC-BH30P, BH40P

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 classifi ed as follows.

■ Safety instructions are classifi ed 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 fi re.

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 ter­minals.

Disconnect
power plug

Disassemble, assemble and replace
parts after disconnecting the power
source. Failure may cause electric
shock or injury.

Make sure to use specifi ed parts.

Make sure to use specifi ed 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

Contents

Page

1. Specifi cations ....................................................................................................................................................... 1

2. Cautions for safe repair work ...............................................................................................................................2

3. Failure diagnostics ...............................................................................................................................................3

4. Disassembly and Reassembly Instructions .......................................................................................................12

5. Schematic diagram ............................................................................................................................................19

6. Parts location and parts list ................................................................................................................................21

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Water fi ll

Water level gauge

Approx. 1000 ml.

-2.0-

-1.0-

-Min-

3.0

Panasonic

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NC-BH30P, BH40P

2. Failure diagnostics

Before starting failure diagnostics, check the operation

following the pot performance test modes described
below.

2.1. Pot performance test mode

2.1.1. Boiling and keep warm test

Procedure

1. Pour approx. 1000 ml water into the container.

2. Turn the power on.

3. Push Select pad and set 98.

The markings in the illustration mean as follows.

● Continuous illumination

Flashing

Performance

1. The reboil lamp illuminates, and the boiling
operation starts. (LCD indicates a temperature
higher than 5°C rounded to every 5°C.)

2. After 9 minutes, vacuum keep warm lamp
illuminates and switches to the keep warm
mode. (Keep warm mode)

÷ After approx. 9 minutes, the 100 keep warm lamp

changes to 98.

÷ After approx. 3 minutes, the 90 keep warm lamp

changes to 98.

÷ After approx. 3 minutes, the 80 keep warm lamp

changes to 98.

÷ After approx. 3 minutes, the 60 keep warm lamp

changes to 98.

÷ Required time for the water temperature to increase

to the set temperature
98 keep warm: approx. 1 to 2 minutes
90 keep warm: approx. 1 to 2 hours
80 keep warm: approx. 2.5 to 4.5 hours
60 keep warm: approx 8.5 to 13 hours
(in conditions of room temperature of 20°C with full

water volume)

60 80 90 98

Dechlorination

Reboil

Timer

Select

Citric acid cleaning
(Push for 3 seconds)

Vacuum keep warm

Pour

out

Unlock

25

60 80 90 98

Dechlorination

Reboil

Timer

Select

Citric acid cleaning
(Push for 3 seconds)

Pour

out

Unlock

10 0

Vacuum keep warm

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NC-BH30P, BH40P

Performance

When Reboil pad is pressed once.

1. The reboil lamp illuminates and reboil starts.
Indication on LCD is as follows.

2. After 1 minute, vacuum keep warm lamp
illuminates. Indication on LCD is as follows.

Performance

When the Reboil pad is pressed twice (for
dechlorination)

1. Reboil lamp illuminates and boiling starts (LCD
changes to 100 in the process). Indication on
LCD is as follows.

2. After 7 minutes, the vacuum keep warm lamp
illuminates. Indication on LCD is as follows.

2.1.2. Reboil and keep warm test

Procedure

1. Switch to keep warm with 98 setting.

2. Press the Reboil pad once or twice.

60 80 90 98

Dechlorination

Reboil

Timer

Select

Citric acid cleaning
(Push for 3 seconds)

Pour

out

Unlock

98

Vacuum keep warm

60 80 90 98

Dechlorination

Reboil

Timer

Select

Citric acid cleaning
(Push for 3 seconds)

Pour

out

Unlock

98

Vacuum keep warm

60 80 90 98

Dechlorination

Reboil

Timer

Select

Citric acid cleaning
(Push for 3 seconds)

Pour

out

Unlock

10 0

Vacuum keep warm

60 80 90 98

Dechlorination

Reboil

Timer

Select

Citric acid cleaning
(Push for 3 seconds)

Pour

out

Unlock

10 0

Vacuum keep warm

Press this pad.

60 80 90 98

Dechlorination

Reboil

Timer

Select

Citric acid cleaning
(Push for 3 seconds)

Pour

out

Unlock

98

Vacuum keep warm

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NC-BH30P, BH40P

2.1.3. Hot water pouring test
(for electric pump operation)

Operation

1. Pour water into the container.

2. Power on.

3. Press the Lock/Unlock pad.

4. Press the Pour out pad.

2.1.4. LCD indication test

Operation

1. Pour water into the container.

2. Power on while pressing the Reboil, Timer, and
Select pads at the same time.

Performance

Press the Lock/Unlock pad and the Pour out pad,

and water fl ows out.

Performance

Indication on LCD is as follows.

Press at the same time.

60 80 90 98

Dechlorination

Reboil

Timer

Select

Citric acid cleaning
(Push for 3 seconds)

Pour

out

Unlock

Vacuum keep warm

60 80 90 98

Dechlorination

Reboil

Timer

Select

Citric acid cleaning
(Push for 3 seconds)

Pour

out

Unlock

18 8

Vacuum keep warm

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NC-BH30P, BH40P

Check points

Keep warm heater

(between the orange, white

and the yellow.

Thermal fuse comp.

(between the blue

and white)

Boiling heater

(between the orange, white

and red)

Motorized pump

Confi rm motor rotation
sound while power is on,
switch on Unlock pad and
turn on hot water Pour out
pad.

Lead wire “E” comp.

(0Ω)

Thermistor (complete)

between blue

and blue :
approx. 20°C,
approx. 45kΩ

Check point-1

2.2. Dismantle procedure for
failure diagnotics

Orange

White

Red

Blue

White

Blue

Yellow

White

Blue

Red

Tapping screw

(M4 x 12)

Truss head screw

Bottom plate

Sleeve

Screw B

Waterproof
cover B

Body

CAUTION

When touching or near the control unit,
discharge static electricity by grounding
the human body, clothes, work table, etc.
through a resister of a few mega ohms.

Microcomputer may be damaged by static
electricity.

Note

When copper foil pattern on control unit is broken,
do not repair and reuse it.

1. Remove 2 Tapping screws and 1 Truss head
screw from Bottom plate.

2. Remove 1 screw and Sleeve from Body.

3. Remove white, orange Lead wire and Earth wire

from Peg frame.

4. Remove Body off.

5. Remove Waterproof cover B.

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2.3. Failure Diagnostics Chart

2.3.1. No power. (There is no power indication.) ➞ Sections 2.4.1 to 2.4.7
describe electric power supply.

The items in the “Check” column correspond to those shown in Check Points on P.6.

Check Diagnostics Method Action

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 across the boiling heater contacts?
(approx. 133Ω)

The container comp.

Power cord Is there connection in the power cord? (0Ω) Replace the power cord.
Lead wire assy. E comp. Is there connection in the lead wire assy. E? (0Ω) Replace the lead wire assy. E.
When the above parts are normal Replace the control unit A (bottom)
When the above parts are normal Replace the control unit B (operation)

2.3.2. Water is not boiling. (Water comes out.)

The items in the “Check” column correspond to those shown in Check Points on P.6.

Check Diagnostics Method Action

Water Heater Is there connection between the white lead wire and

the red lead wire? (approx.14Ω)

Replace the container comp.

When the above parts are normal Replace the control unit A (bottom)
When the above parts are normal Replace the control unit B (operation)

2.3.3. Water does not come out, or water fl ow is restricted. (Water is boiling.)

Check point

Diagnostics Method Action

Is the fi lter (located at the bottom of container) clogged? Clean or replace the fi lter.

The items in the “Check” column correspond to those shown in Check Points on P.6.

Check Diagnostics Method Action

Electric pump

Turn on the 100V power, and press the Lock/Unlock pad fi rst
and then the Pour out pad. Is the motor heard running?

Replace the electric pump.

Lead wire assy. E comp.

Is there a miss-connection in the lead wire assy. E (0Ω)

Replace the lead wire assy. E.
When the above parts are normal Replace the control unit B (bottom)
When the above parts are normal Replace the control unit A (operation)

2.3.4. Reboil and Vacuum Keep Warm lamps illuminate alternately.
(Overheating protection mode/Bottom thermistor disconnection comp. mode)

Check point

Diagnostics Method Action

Is there water inside? Supply water and press Reboil pad.

The items in the “Check” column correspond to those shown in Check Points on P.6.

Check Diagnostics Method Action

Thermistor comp. Is there connection between blue lead wire and blue

lead wire? (approx.45Ω at approx. 20°C)

Replace the thermistor comp.

Lead wire E comp. Is there connection in the lead wire assy. E? (0Ω) Replace lead wire E comp.
When the above parts are normal Replace the control unit B (bottom)
When the above parts are normal Replace the control unit A (operation)

2.3.5. The Select pad does not work

Check Diagnostics Method Action

– – Replace the control unit B (bottom)

When the above parts are normal Replace the control unit A (operation)

2.3.6. The Lock/Unlock pad does not work.

The items in the “Check” column correspond to those shown in Check Points on P.6.

Check Diagnostics Method Action

Lead wire E comp. Is there miss-connection in the lead wire assy E? (0Ω) Replace lead wire E comp.
When the above parts are normal Replace the control unit B (bottom)

When the above parts are normal Replace the control unit A (operation)

2.3.7. Hot water does not dispense smoothly.
(Immediately after being boiled in particular) Boiling is too noisy.
Scale accumulation becomes severe inside the container.

Check Diagnostics Method Action

– – Clean with citric acid

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NC-BH30P, BH40P

60 80 90 98

18 8

Vacuum keep warm

60 80 90 98

25

Vacuum keep warm

60 80 90 98

98

Vacuum keep warm

60 80 90 98

70

Vacuum keep warm

60 80 90 98

10 0

Vacuum keep warm

60 80 90 98

90

Vacuum keep warm

60 80 90 98

Vacuum keep warm

2.4. Indication in LCD and example of operation

2.4.1. All lights are on

2.4.2. Cleaning

(Cleaning by citric acid - - mark will rotate)

(Reboil LED: Light is on)

2.4.3. Boiling (at 90 keep warm setting)

When power on (Boiling)
(Reboil LED: Light is on)

Temperature rises. Detection of boiling

Reboil LED: Light is off)

(Keep warm LED: Light is on)

(Keep warm LED: Light is on) (Keep warm LED: Light is on)

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