Whirlpool KM-30 User Manual

MICROWAVE

OVEN HOOD

COMBINATION

KM-30

8178573

i

FORWARD

This Job Aid, “Whirlpool Microwave Oven Hood Combination,” (Part No. 8178573), provides the
In Home Service Professional with information on the operation and service of the Whirlpool Micro-

wave Oven Hood Combination. It is to be used as a training Job Aid and Service Manual. For specic

information on the model being serviced, refer to the “Use and Care Guide,” or “Tech Sheet” provided
with the microwave oven.

The Wiring Diagrams and Strip Circuits used in this Job Aid are typical and should be used for
training purposes only. Always use the Wiring Diagram supplied with the product when servicing
the unit.

GOALS AND OBJECTIVES

The goal of this Job Aid is to provide detailed information that will enable the In Home Service Profes­sional to properly diagnose malfunctions and repair the Microwave Oven Hood Combination.

The objectives of this Job Aid are to:

• Understand and follow proper safety precautions.

• Successfully troubleshoot and diagnose malfunctions.

• Successfully perform necessary repairs.

• Successfully return the microwave oven to proper operational status.

WHIRLPOOL CORPORATION assumes no responsibility for any repairs made

on our products by anyone other than Authorized In Home Service Professionals.

Copyright © 2006, Whirlpool Corporation, Benton Harbor, MI 49022

ii

TABLE OF CONTENTS

GENERAL ................................................................................................................................. 1-1

Important Safety Information ............................................................................................1-1

Warning to In Home Service Professionals ...................................................................... 1-2

Precautions To Be Observed Before and During Servicing

to Avoid Possible Exposure to Excessive Microwave Energy .......................................... 1-3

R.F. Leakage Test ............................................................................................................. 1-4

Whirlpool Model Number Designations ............................................................................1-5

Whirlpool Serial Number Designations ............................................................................. 1-6

Model & Serial Number Label and Tech Sheet Locations ................................................ 1-6

Specications .................................................................................................................... 1-7

Whirlpool Microwave Oven Warranty ................................................................................1-10

INSTALLATION INFORMATION ...............................................................................................

Hood Fan Motor Mounting Positions ................................................................................2-1

THEORY OF OPERATION ........................................................................................................ 3-1

Air Flow Paths ................................................................................................................... 3-1

COMPONENT ACCESS ...........................................................................................................

Component Locations ....................................................................................................... 4-1

Removing the Turntable Motor & Hood (Cooktop) Lamp Assembly ................................. 4-2

Removing the Control Panel & Control Board .................................................................. 4-4

Removing the Motor Capacitor and Line Fuse ................................................................. 4-6

Removing the Door Switches ...........................................................................................4-6

Removing the Oven Cavity Lamp and Charcoal Filter ...................................................... 4-8

Removing the Oven Rack Retainers ................................................................................4-9

Removing the Outer Cabinet ............................................................................................ 4-10

Removing the Thermostats and Thermistor ...................................................................... 4-11

Removing the Magnetron .................................................................................................4-12

Removing the High-Voltage Transformer .......................................................................... 4-13

2-1

4-1

Removing the High-Voltage Diode and Capacitor ............................................................ 4-14

Removing the Oven Cavity Lamp Socket ......................................................................... 4-15

Removing the AC Line Filter ............................................................................................. 4-16

Removing the Hood Fan Motor and Humidity Sensor ...................................................... 4-17

Removing the Fuse Holder & Mounting Bracket ............................................................... 4-18

Removing the Door and Door Disassembly ...................................................................... 4-19

COMPONENT TESTING ...........................................................................................................

H.V. Transformer ............................................................................................................... 5-1

Magnetron ......................................................................................................................... 5-2

H.V. Capacitor ................................................................................................................... 5-2

H.V. Diode ......................................................................................................................... 5-3

iii

5-1

TABLE OF CONTENTS - CONTINUED

Turntable Motor ................................................................................................................. 5-3

Humidity Sensor ...............................................................................................................5-4

Hood Exhaust Fan Motor .................................................................................................. 5-4

AC Line Filter .................................................................................................................... 5-5

Thermostats ...................................................................................................................... 5-5

DIAGNOSIS & TROUBLESHOOTING ..................................................................................... 6-1

Interlock Switch Checkout Procedures ............................................................................. 6-1

Touch Panel and Electronic Control Test .......................................................................... 6-2

Microwave Oven Power Output Test ................................................................................ 6-3

Failure Codes Indications ................................................................................................. 6-3

WIRING DIAGRAM & STRIP CIRCUITS ..................................................................................

Wiring Diagram - 8205889 - Sensor Model ......................................................................7-1

Wiring Diagram - 8205660 - Non Sensor Model ............................................................... 7-2

Strip Circuits .....................................................................................................................7-3

Microwave Cooking ..................................................................................................... 7-3

Hood Exhaust Fan On High Automatically .................................................................. 7-3

Hood Exhaust Fan On Low Speed.............................................................................. 7-3

Hood Exhaust Fan On High / Medium ........................................................................ 7-4

Microwave Oven Plugged In—Time of Day Displayed ............................................... 7-4

Door Open—Oven Cavity Light Is On ......................................................................... 7-4

Cooktop Light On High ................................................................................................ 7-4

Cooktop Light On Low (Night Light) ............................................................................ 7-4

7-1

iv

GENERAL

IMPORTANT SAFETY INFORMATION

ELECTROSTATIC DISCHARGE

(ESD) SENSITIVE ELECTRONIC

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 nished,

but failure may occur at a later date
due to ESD stress.

IMPORTANT SAFETY

INSTRUCTIONS

Before touching any oven component or wiring,
always unplug the oven from its power
source and discharge the capacitor by using a
20,000 ohm discharge resistor or use an insulat­ed plastic handle screwdriver to short across
the capacitor terminals.

Check that the unit is grounded before trouble­shooting. Discharge any static charge from your
body by touching ground before handling any part
of the circuitry on the control board. Electrostatic
discharge may damage the control circuit.

Do not touch oven components or wiring during
operation. Attach meter leads with alligator
clips when making operational tests.
For continued protection against radiation
emission, replace only with these types of
switches: Primary (Interlock) Switch: SZM-V16­FA-63 or VP-533A-OF; Secondary (Interlock)
Switch: SZM-V01-FA-32; Interlock (Monitor)
Switch: SZM-VI6-FA-62 or VP-532A-OF; Oven
Lamp Switch: SZM-V6-FA-31 or VP-331 AOD.

• Use an antistatic wrist strap. Connect
the wrist strap to a green ground connection
point or unpainted metal in the

appliance; or touch your nger repeatedly

to a green ground connection point
or unpainted metal in the appliance.

• Before removing the part from its package,
touch the antistatic bag to a green
ground connection point or unpainted
metal in the appliance.

• Avoid touching electronic parts or terminal
contacts. Handle the electronic
control assembly by the edges only.

• When repackaging the failed electronic
control assembly in an antistatic bag,
observe the above instructions.

It is neither necessary nor advisable to attempt
measurement of high voltage.

Attaching the adaptor ground terminal to the
wall receptacle cover screw does not ground
the appliance unless the cover screw is metal
and not insulated and the wall receptacle is
grounded through the house wiring.

1-1

WARNING TO IN HOME SERVICE PROFESSIONALS

To avoid possible exposure to microwave
radiation or energy, visually check the oven for
damage to the door and door seal before
operating any oven. Use a microwave survey
meter to check the amount of leakage before
servicing. In the event the R.F. Ieakage exceeds
4 mw/cm2 at 5 cm, appropriate repair
must be made before continuing to service the
unit. Check interlock function by operating the
door latch. The oven cook cycle should cut off
before the door can be opened.

The door and latching assembly contains the
radio frequency energy within the oven. The
door is protected by three safety interlock
switches. Do not attempt to defeat them.

Under no circumstances should you try to
operate the oven with the door open.

• Proper operation of microwave ovens requires
that the magnetron be properly
assembled to the waveguide and cavity.
Never operate the magnetron unless it is
properly installed.

• Be sure the “RF” seal is not damaged and
is assembled around the magnetron dome
properly when installing the magnetron.

• Routine service safety procedures should
be exercised at all times.

• Untrained personnel should not attempt
service without a thorough review of test
procedures and safety information contained
in this Job Aid.

Whirlpool microwave ovens have a monitoring
system designed to ensure proper operation of
the safety interlock systems.

The interlock monitor switch will immediately
cause the oven fuse to blow if the door is
opened and the primary door interlock switch
and/or the secondary interlock switch contacts
fail in a closed position.

CAUTION: Replace a blown fuse with a 20
ampere class H fuse only.

Test the upper and lower door interlock
switches, cook relay and interlock monitor
switch (middle switch) for proper operation as
described in the component test procedures,
before replacing the blown oven fuse.

Do not attempt to repair sticking contacts
of any interlock switch, safety switch, or
Cook (Latch) relay. The components must
be replaced.

Any indication of sticking contacts during compo­nent tests requires replacement of that compo­nent to ensure reliability of the safety interlock
system.

NOTE: If the fuse is blown, the monitor, primary,
and secondary interlock switches must be re­placed. Be sure they are properly connected.

1-2

PRECAUTIONS TO BE OBSERVED BEFORE AND

DURING SERVICING TO AVOID POSSIBLE EXPOSURE

TO EXCESSIVE MICROWAVE ENERGY

A. Do not operate or allow the oven to be

operated with the door open.

B. Make the following safety checks on all

ovens to be serviced before activating the
magnetron or other microwave source,
and make repairs as necessary:

1) Interlock operation

2) Proper door closing

3) Seal and sealing surfaces (arcing,
wear, and other damage)

4) Damage to or loosening of hinges and
latches

5) Evidence of dropping or abuse

C. Before turning on the microwave power

for any service test or inspection within the
microwave generating components, check the
magnetron, wave guide or transmission
line, and cavity for proper alignment,
integrity, and connections.

D. Any defective or misadjusted components

in the interlock, monitor, door seal, and
microwave generation and transmission
systems shall be repaired, replaced, or
adjusted, using procedures described in
this Job Aid, before the oven is released to
the owner.

E. A microwave leakage check to verify compli-

ance with Federal Performance Standard
should be performed on each oven
prior to release to the owner.

F. Do not attempt to operate the oven if the

door glass is broken.

1-3

R.F. LEAKAGE TEST

EQUIPMENT

• Electromagnetic energy leakage monitor
(NARDA 81 00B, HOLADAY H 1501 ).

• 275 ±15 ML glass beaker.

TEST

On every service call, checks for microwave
energy emission must be made according to
the following manner.

1. Remove the cooking rack from the oven

cavity, if the microwave oven is so equipped.

2. Place a 275 ±15 ML (9.3 oz.) glass of

water in the center of the oven bottom.

3. Select “HIGH” cook power, turn the microwave

oven on, and test for R.F. Ieakage at
the following locations:
a) Around the cabinet at the front.
b) Around the door.
c) Across the console panel.
d) Horizontally across the door.
e) Vertically across the door.
f) Diagonally across the door.
g) Across the air vents.
h) Across the rear air vent.
i) All lockseams.
j) Weld at bottom.
k) Bottom plate.
I) Oven feet.

4. The scan speed is one inch per second.

When checking for R.F. Ieakage, use an ap­proved R.F. measuring device to ensure less
than 4 mw/cm2 emission at 5 cm distance with
a maximum scan rate of 2.54 cm/second, in
compliance with U.S. Government Department
of Health, Education and Welfare 21CFR1030,
performance Standard for Microwave Ovens.
A properly operating door and seal assembly
will normally register small emissions, but they
must be no greater than 4 mw/cm2 to allow for
measurement uncertainty.

NOTE: Enter leakage readings in BEFORE and
AFTER spaces on the service document.

All microwave ovens exceeding the emission
level of 4 mw/cm2 must be reported to Dept. of
Service for microwave ovens immediately and
the owner should be told not to use the micro­wave oven until it has been repaired completely.

If a microwave oven is found to operate with the
door open, report to Dept. of Service, the
manufacturer and CDRH* immediately. Also
tell the owner not to use the oven.

The interlock monitor switch acts as the nal

safety switch protecting the customer from
microwave radiation. If the interlock monitor
switch operated to blow the fuse when the
interlocks failed, you must replace all interlock
switches with new ones, because the contacts
of those interlock switches may be melted and
welded together.

If safety interlock/monitor switch replacement,
or adjustment, is required, you must reconnect
the circuit, and perform a continuity check on
the monitor circuit.

All repairs must be performed in such a manner
that microwave energy emissions are minimal.

Address for CDRH is:

Ofce of Compliance (HFZ-342) Center for

Devices and Radiological Health
2098 Gaither Road
Rockville, MD 20850

* CDRH: Center for Devices and Radiological

Health, Food and Drug Administration.

1-4

WHIRLPOOL MODEL NUMBER DESIGNATIONS

MODEL NUMBER M H 2 17 5 X S T 0

INTERNATIONAL SALES IND.

OR MARKETING CHANNEL
IF PRESENT

PRODUCT GROUP
G = WHIRLPOOL GOLD
M = MICROWAVE

PRODUCT IDENTIFICATION
B = BROWNER
C = CONVECTION
G = GRILL / CRISPER
H = OTR HOOD COMBO
K = KITS
M = GOLD CONVECTION
S = STIRRER FAN
T = TURNTABLE

MODEL VARIATIONS

0 - 9

CUBIC FEET

04 = .4 CU. FT. 09 = 0.9 CU. FT. 15 = 1.5 CU. FT.
06 = .6 CU. FT. 10 = 1.0 CU. FT. 16 = 1.6 CU. FT.
07 = .7 CU. FT. 12 = 1.2 CU. FT. 17 = 1.7 CU. FT.
08 = .8 CU. FT. 14 = 1.4 CU. FT.

FEATURE LEVEL

0 = 30” KIT (IF KIT)
2 = 22” KIT (IF KIT)
4 = 24” KIT (IF KIT)
5 = SENSORED MODEL
7 = 27” KIT (IF KIT)

FEATURE CODE

C = CSA APPROVED
S = CARRY IN WARRANTY (EFFECTIVE 02/96)
X = IN HOME WARRANTY (EFFECTIVE 02/96)

YEAR OF INTRODUCTION

S = 2006, T = 2007, V = 2008

COLOR CODE

B = BLACK, Q = WHITE, T = BISCUIT

ENGINEERING CHANGE (0, 1, 2, 3, ETC.)

1-5

WHIRLPOOL SERIAL NUMBER DESIGNATIONS

SERIAL NUMBER TR T 06 10001

MANUFACTURING SITE

TR = Shunde

YEAR OF PRODUCTION

T = 2006

WEEK OF PRODUCTION

06 = 6th week of the year

PRODUCT SEQUENCE NUMBER

MODEL & SERIAL NUMBER LABEL AND

TECH SHEET LOCATIONS

Model & Serial

Number Location

1-6

Tech Sheet Location

(In black poly bag)

SPECIFICATIONS

MO DEL MH 2175XS

Fea tur e Level/Series SENSOR Cooking

Color s

White, Black, Biscuit and Stainless

CONTROL SYSTE M

Timer Electronic

Limits 99 Min. 99 Sec.

Operation TOUCH CONTROL, 30 Pads

Display Blue Green with scrolling text

Convection Cooking Cycles No

Keypad Disable / Child Lockout Mode Yes - Press "Cancel" Key for 3 Seconds
Cooktop Light Wattage One Incandescent 40 Watt bulb

Settings 3 levels (High, Night/Low, Off)

Fan Speed Indication "Low - Medium - High" -Scrolling Text

Power Failure Indication Yes - ' ' Displayed Flashing

Invalid Data Entry "BEEP"

Technical Error Indication "F-" With Error Number
Diagnostic System Yes

OVE N I NTERIOR F EATURES

Capacity 1.7 cu. ft.

Size W x H x D (inches)

21" W x 9 1/2" H x 14" D

Size W x H x D (mm)

535 x 240 x 355 mm

Cooking Power 1000 Watts (IEC-705 Rating)

Turn Table Yes, Sunken Flush

Cooling Fan Automatic - On if oven is operating,

Off if door open

Oven Light Automatic - Turns on when oven

door is open or oven is operating. (30 Watt)

DOOR F E ATURES

Handle/Latch Yes/Pull to open
Seals Two Stage (Capacitive and Reflective)

MICROWAVE SYSTE M

Distribution Top Feed w/ Stirrer

Magnetron One standard

SAFE TY F EATURES

Interlock

Three Door/Latch Operated (Primary, secondary and monitor)

Thermal Protectors

Four - 1 Magnetron, 1 Oven Cavity, 1 Hood, 1 Wave Guide

VENTILATION SYSTEM

Type Convertible Recirculation or Exhaust Vertical/Horizontal

Duct Outlet Size 3 1/4"H x 10"W

Recirculation CF M

112

Exhaust CFM

221

Touch Control 4 Speed

Exhaust Fan 'Auto ON - High Speed YES : 60° C, 140°F

Noise Level Recirculation (Acc. to IEC 704) 67dBA

Grease Filter Yes (2)-low cost

Charcoal Filter Yes (2)

Blower Type

Two Squirrel Cage Blower. Left fan wheel for hood airflow and cavity ventilation.

Right fan for cooling airflow

Shipped Recirculation mode

EXTERI OR F EATURES

Power Cord Length 3 Feet

OTHE R SP ECIF ICATIONS

Electrical 120V, Single Phase, 60 Hz

1800 Watts, For Use With 15 - 20 Amp Circuit

Domestic Use Only Yes

Agency Approvals FCC, DHHS, U.L. Listed, CSA
Approx. Net Weight - Lb 57 lbs.

LITE RATURE

Use & Care Guide 8205887

Installation Instructions 8206433

Warranty In Use & Care Guide

Tech Sheet 8205889

1-7

M O DEL M H 1160XSB/Q

Feature Level/Series Basic Non Sensor

Colors Black, White

CONTROL SYSTEM

Timer Electronic

Limits 99 Min. 99 Sec.

Operation TOUCH CONTROL, 25 Pads

Display Blue Green with scrolling text--Dual Language English and French

Convection Cooking Cycles No

Keypad Disable / Child Lockout Mode Yes - Press "Cancel" Key for 3 Seconds
Cooktop Light Wattage One Incandescent 40 Watt bulb

Fan Speed Indication "Low-Medium-High"-Scrolling Text

Power Failure Indication Yes - ':' Displayed Flashing

Invalid Data Entry "BEEP"

Technical Error Indication "F-" With Error Number
Diagnostic System Yes

OVEN INTERIOR FEATURES

Capacity 1.6 cu. ft.
Interior Dimensions W x H x D 21" W x 9 1/2" H x 14" D

Interior Dimensions W x H x D (mm) 535 x 240 x 355 mm

Cooking Power 950 Watts (IEC-705 Rating)

Turn Table Yes, Sunken Flush

Cooling Fan Automatic - On if oven is operating,

Off if door open

Oven Light Automatic - Turns on when oven

door is open or oven is operating. (30 Watts)

DOOR FEA TURES

Seals Two Stage (Capacitive and Reflective)

MICROWAVE SYSTEM

Distribution Top Feed w/o Stirrer
Magnetron One standard

SAFETY FEATURES

Interlock Three Door/Latch Operated

Primary, secondary and monitor

Thermal Protectors Four - 1 Magnetron, 1 Oven Cavity, 1 Hood, 1 Wave Guide

VENTIL A TION SYSTEM

Type Convertible Recirculation or Exhaust Vertical/Horizontal

Duct Outlet Size 3 1/4"H x 10"W
Recirculation CFM Out

112

Exhaust CFM Out

221

Touch Control 2 Speed

Exhaust Fan Auto ON - High Speed YES : 60° C, 140°F

Noise Level Recirculation (Acc. to IEC 704) Sound Power Level: 70 dB(A)

Grease Filter Yes (2)

Charcoal Filter Yes (1)

Blower Type/ Ventilation

Twin Squirrel Cage Blower: Left fan wheel for hood airflow and cavity ventilation.

Right fan for cooling airflow.

Shipped Recirculation mode

EXTERIOR FEA TURES

Power Cord Length 3 Feet

OTHER SPECIFICA TIONS

Electrical 120V, Single Phase, 60 Hz

1800 Watts, For Use With 15 - 20 Amp Circuit

Domestic Use Only Yes

Agency Approvals FCC, DHHS, UL, CUL
Approx. Net Weight - Lb 57 lbs.

LITERA TURE

Use & Care Guide 8205884

Installation Instructions 8205870

Warranty In Use & Care Guide

Tech Sheet 8205886

JobAid

8178573

1-8

MH 1170XS TM H16XS

Basic Non Sensor Basic Non Sensor

Black, White, Biscuit and Stainless (B)Black, (Q)White, (D)Silver

Electronic Electronic

99 Min. 99 Sec. 99 Min. 99 Sec.

TOUCH CONTROL, TOUCH CONTROL,

Blue Green scrolling text--Dual Language English and French Blue Green with scrolling text--Dual Language English and French

No No

Yes - Press "Cancel" Key for 3 Seconds Yes - Press "Cancel" Key for 3 Seconds

One Incandescent 40 Watt bulb One Incandescent 40 Watt bulb

"Low-Medium-High"-Scrolling Text "Low-Medium-High"-Scrolling Text

Yes - ':' Displayed Flashing Yes - ':' Displayed Flashing

"RETRY"-Scrolling Text "RETRY"-Scrolling Text

"F-" With Error Number "F-" With Error Number

Yes Yes

1.7 cu. ft. 1.6 cu. ft.

21" W x 9 1/2" H x 14" D 21" W x 9 1/2" H x 14" D

535 x 240 x 355 mm 535 x 240 x 355 mm

1000 Watts (IEC-705 Rating) 1000 Watts (IEC-705 Rating)

Yes, Sunken Flush, Stoppable Yes, Sunken Flush

Automatic - On if oven is operating, Automatic - On if oven is operating,

Off if door open Off if door open

Automatic - Turns on when oven Automatic - Turns on when oven

door is open or oven is operating. (30 Watts) door is open or oven is operating. (30 Watts)

Two Stage (Capacitive and Reflective) Two Stage (Capacitive and Reflective)

Top Feed w/o Stirrer Top Feed w/o Stirrer

One standard One standard

Three Door/Latch Operated (Primary, secondary and monitor) Three Door/Latch Operated (Primary, secondary and monitor)

(Primary, secondary and monitor) (Primary, secondary and monitor)

Four - 1 Magnetron, 1 Oven Cavity, 1 Hood, 1 Wave Guide Four - 1 Magnetron, 1 Oven Cavity, 1 Hood, 1 Wave Guide

Convertible Recirculation or Exhaust Vertical/Horizontal Convertible Recirculation or Exhaust Vertical/Horizontal

3 1/4"H x 10"W 3 1/4"H x 10"W

112 112

221 221

2 Speed 2 Speed

YES : 60° C, 140°F YES : 60° C, 140°F

Sound Power Level: 70 dB(A) Sound Power Level: 70 dB(A)

Yes (2) Yes (2)

Yes (1) Yes (1)

Twin Squirrel Cage Blower: Left fan wheel for hood airflow and cavity ventilation.

Right fan for cooling airflow.

Twin Squirrel Cage Blower: Left fan wheel for hood airflow and cavity ventilation.

Right fan for cooling airflow.

Recirculation mode Recirculation mode

3 Feet 3 Feet

120V, Single Phase, 60 Hz 120V, Single Phase, 60 Hz

1800 Watts, For Use With 15 - 20 Amp Circuit 1800 Watts, For Use With 15 - 20 Amp Circuit

Yes Yes

FCC, DHHS, UL, CUL FCC, DHHS, UL, CUL

57 lbs. 57 lbs.

8205884 8205884

8205870

8205870

In Use & Care Guide In Use & Care Guide

8205880

8178573 8178573

1-9

WHIRLPOOL MICROWAVE OVEN WARRANTY

WHIRLPOOL CORPORATION MAJOR APPLIANCE WARRANTY

ONE YEAR LIMITED WARRANTY

For one year from the date of purchase, when this major appliance is operated and maintained according to instructions attached to or
furnished with the product, Whirlpool Corporation or Whirlpool Canada LP (hereafter “Whirlpool”) will pay for FSP

®

replacement parts

and repair labor to correct defects in materials or workmanship. Service must be provided by a Whirlpool designated service company.

ITEMS WHIRLPOOL WILL NOT PAY FOR

1. Service calls to correct the installation of your major appliance, to instruct you how to use your major appliance, to replace or repair

house fuses or to correct house wiring or plumbing.

2. Service calls to repair or replace appliance light bulbs, air filters or water filters. Those consumable parts are excluded from warranty
coverage.

3. Repairs when your major appliance is used for other than normal, single-family household use.

4. Damage resulting from accident, alteration, misuse, abuse, fire, flood, acts of God, improper installation, installation not in

accordance with electrical or plumbing codes, or use of products not approved by Whirlpool.

5. Any food loss due to refrigerator or freezer product failures.

6. Replacement parts or repair labor costs for units operated outside the United States or Canada.

7. Pickup and delivery. This major appliance is designed to be repaired in the home.

8. Repairs to parts or systems resulting from unauthorized modifications made to the appliance.

9. Expenses for travel and transportation for product service in remote locations.

10. The removal and reinstallation of your appliance if it is installed in an inaccessible location or is not installed in accordance with

published installation instructions.

DISCLAIMER OF IMPLIED WARRANTIES; LIMITATION OF REMEDIES

CUSTOMER'S SOLE AND EXCLUSIVE REMEDY UNDER THIS LIMITED WARRANTY SHALL BE PRODUCT REPAIR AS PROVIDED
HEREIN. IMPLIED WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE,
ARE LIMITED TO ONE YEAR OR THE SHORTEST PERIOD ALLOWED BY LAW. WHIRLPOOL SHALL NOT BE LIABLE FOR
INCIDENTAL OR CONSEQUENTIAL DAMAGES. SOME STATES AND PROVINCES DO NOT ALLOW THE EXCLUSION OR LIMITATION
OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, OR LIMITATIONS ON THE DURATION OF IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS, SO THESE EXCLUSIONS OR LIMITATIONS MAY NOT APPLY TO YOU. THIS WARRANTY GIVES
YOU SPECIFIC LEGAL RIGHTS AND YOU MAY ALSO HAVE OTHER RIGHTS, WHICH VARY FROM STATE TO STATE OR PROVINCE
TO PROVINCE.

Outside the 50 United States and Canada, this warranty does not apply. Contact your authorized Whirlpool dealer to determine if
another warranty applies.

If you need service, first see the “Troubleshooting” section of the Use & Care Guide. After checking “Troubleshooting,” additional help
can be found by checking the “Assistance or Service” section or by calling Whirlpool. In the U.S.A., call 1-800-253-1301. In Canada,
call 1-800-807-6777.

8/05

Keep this book and your sales slip together for future
reference. You must provide proof of purchase or installation
date for in-warranty service.

Write down the following information about your major appliance
to better help you obtain assistance or service if you ever need it.
You will need to know your complete model number and serial
number. You can find this information on the model and serial
number label located on the product.

Dealer name ____________________________________________________

Address ________________________________________________________

Phone number __________________________________________________

Model number __________________________________________________

Serial number __________________________________________________

Purchase date __________________________________________________

8205884

© 2005 Whirlpool Corporation.

.A.S.U,looplrihWfokramedarTMT/kramedarTderetsigeR®.devresersthgirllA

4619-652-68351

11/05

Printed in China

1-10

INSTALLATION INFORMATION

HOOD FAN MOTOR MOUNTING POSITIONS

RECIRCULATING AIR

REAR VENTED AIR

Airow towards front of unit.

Note: this is the way the

unit is shipped.

Airow towards rear of unit. Unplug

wire, turn fan motor over, and plug

wire back into the quick disconnect

socket over the top of the fan motor.

TOP VENTED AIR

Airow towards top of unit.

2-1

---- NOTES ----

2-2

THEORY OF OPERATION

AIRFLOW PATHS

The microwave uses the exhaust blower motor to remove vapors from the cooking area below the
unit, it also circulates air within the unit to assist cooking performance and cool the operating compo­nents.

Cooktop

Venting

Component

cooling

This process is accomplished by using one side
of the blower motor assembly to pull ambient air
into the unit to cool the working components,

and the remaining side of the blower for exhaust­ing steam and cooking odors.

3-1

Air is circulated in the unit to assist cooking
performance.

The motor operates at two speeds--low speed all
of the time and high speed during sensor-cooking
modes.

3-2

COMPONENT ACCESS

PartsLayout

(nottoscale)

A. Hood fan motor assembly
B. Humidity sensor
C. H.V. capacitor
D. AC line filter
E. Magnetron

F. Magnetron thermostat—opens at 257ºF

(125ºC), closes at 185ºF (85ºC)

G. Cavity thermostat 1—opens at 257ºF

(125ºC), closes at -31ºF (-35ºC)

H. Cavity thermostat 2—opens at 257ºF

(125ºC), closes at -31ºF (-35ºC)

I. H.V. transformer

J. H.V. diode

K. NTC thermistor

L. Motor capacitor

M. Line fuse

N. Fuse holder

O. Power display

P. Electronic control

Q. Touch panel

R. Secondary interlock switch
S. Monitor interlock switch

T. Primary interlock switch

U. Lamp holders

V. Hood (cooktop) lamp

W. Turntable motor

X. Cavity lamp

A

B

C

D

E

F

G

H

I

J
K

L

M

N

O

P

Q

R

S

U

U

T

W

V

3

5

5

1

P

5

X

This section instructs you on how to service each component inside the Model MH2175XS
Microwave Oven Hood Combination. The components and their locations are shown below.

COMPONENT LOCATIONS

4-1

REMOVING THE TURNTABLE MOTOR &

HOOD (COOKTOP) LAMP ASSEMBLY

IMPORTANT: When you work on the microwave

oven, be careful when handling the sheet metal
parts. Sharp edges may be present, and you
can cut yourself if you are not careful.

1. Unplug microwave oven or disconnect power.

4. Remove the wire from the wire clip towards the
middle of the bottom cover.

5. To remove the turntable motor:
a) Remove the glass turntable, roller assembly,
and spindle from inside the oven cavity.

2. Remove the ten screws from the bottom
cover and partially lower the top edge
of the cover so you can access the component
wiring below it.

3. Disconnect the wire connector at the right side.

b) There are two small holes on the connector.
Lower the bottom cover just far enough to get
a sharp tool with the right size (diameter less
than 2mm) to press into the two access holes
one by one and release the connector.

4-2

c) Remove the two screws from the turntable
motor and remove the motor.

NOTE: When reassembling the wire connec­tor onto the turntable motor, make sure the
holes of the connector are facing away from
the bottom of the unit, outward toward you.

6. To remove the cooktop lamp assembly:
a) Remove the one screw to the left of the
lamp housing that secures the lamp cover to
the bottom of the unit.

f) Remove one screw to remove the lamp
socket.

b) Remove the lamp from the socket.

c) Remove the two screws to the right of the

lamp housing that secure the lamp xture

electrical box cover to the inside of the bottom
cover.

a

d) Remove the bottom cover from the unit.
(see page 4-2 steps 1 thru 4)

c

e) Remove the electrical box cover to expose
the lamp socket, wire connectors and one
screw.

4-3

REMOVING THE CONTROL PANEL & CONTROL BOARD

5. Push the panel up to release the tabs from the
slots. Pull the panel away from the microwave
unit to gain access to the back side of it.

IMPORTANT: When you work on the microwave
oven, be careful when handling the sheet metal
parts. Sharp edges may be present, and you
can cut yourself if you are not careful.

6. Disconnect the seven wire connectors from the

1. Unplug microwave oven or disconnect power.

2. Remove the two screws from the top of the
grille.

control board.

3. Pull the top of the air grille forward, lift the bot­tom tabs from the slots, and remove the grille.

4. Remove the screw from the top of the control
panel.

P3

P2

Black

Brown

P4

Ground

P1

4-4

7. To remove the microcomputer board:

a) Remove 2 screws at the top and release
2 tabs at the bottom to be able to lift the top
board.

Screws

c) Press in on the locking tab end of the arm
and lift the arm to release the touch panel rib­bon cable.

d) You can now remove the microcomputer
board assembly.

Tabs

b) Remove 5 screws from the bottom board to
release it from the touch panel assembly.

e) To remove the microcomputer board mount­ing bracket release 4 tabs.

f) Pull the bracket out of the touch panel as­sembly.

4-5

REMOVING THE MOTOR CAPACITOR AND LINE FUSE

REMOVING THE DOOR SWITCHES

IMPORTANT: When you work on the microwave

oven, be careful when handling the sheet metal
parts. Sharp edges may be present, and you
can cut yourself if you are not careful.

To remove the door switches:

1. Unplug microwave oven or disconnect power.

2. Remove the control panel (see page 4-4).

3. Open the microwave oven door.

4. The Primary interlock switch and Monitor inter­lock switch are attached to a mounting bracket
at the top.

Primary interlock switch

and Monitor interlock

switch assembly

1. Unplug microwave oven or disconnect power.

2. Remove the control panel (see page 4-4).

3. To remove the motor capacitor, remove one
screw.

Motor Capacitor

Screw

Top switch

assembly screw

Bottom switch

assembly screw

Secondary inter-

lock switch

Line Fuse

4. To remove the line fuse, pull the fuse out of the
fuse holder.

5. The secondary interlock switch is attached to a
mounting bracket at the bottom.

4-6

6. To remove a switch assembly, remove the
mounting screw from the front panel of the
microwave for the desired assembly.

7. Use a at blade screwdriver to push the latch

arm back just far enough to release the mount­ing tab and remove the assembly from the unit.

Mounting

screw

Latch arm

Mounting tab

8. Disconnect the wire connectors from the termi­nals.

10. The Primary interlock switch and Monitor
interlock switch are located on opposite sides
of their mounting bracket. The Primary inter­lock switch can be removed from the mounting
bracket in the same manner as shown above
for the Monitor interlock switch.

Primary

Interlock

Monitor

Interlock

Switch

Switch

9. To remove the monitor interlock switch from
the mounting bracket, press the locking tabs
away from the switch and slide the switch up
off the mounting posts.

Locking tab

Locking tab

4-7

REMOVING THE OVEN CAVITY LAMP AND CHARCOAL FILTER

To remove the charcoal lter:

1. Unplug microwave oven or disconnect power.

2. Remove the air grille (see page 4-4).

3. Lift the charcoal lter from the mounting frame

and pull it out of the microwave unit.

4. Replace the charcoal lter with the correct

IMPORTANT: When you work on the microwave
oven, be careful when handling the sheet metal
parts. Sharp edges may be present, and you
can cut yourself if you are not careful.

1. Unplug microwave oven or disconnect power.

2. Remove the air grille (see page 4-4).

replacement lter.

Charcoal lter

3. To change the oven cavity lamp, lift the tab on
the cover to access the lamp.

Lift tab to access lamp

4. Unscrew the lamp from the socket. There will
be a dab of silicone that is intended to keep
the bulb from loosening in the socket during
shipping. Be sure to clean off any loose sili­cone from the socket before installing a new
lamp.

4-8

REMOVING THE OVEN RACK RETAINERS

IMPORTANT: When you work on the microwave

oven, be careful when handling the sheet metal
parts. Sharp edges may be present, and you
can cut yourself if you are not careful.

1. Unplug microwave oven or disconnect power.

2. Open the microwave oven door.

3. Locate the four oven rack retainers, two on
each side of the oven interior.

4. Remove the one screw that attaches each rack
retainer to the wall of the microwave oven.

4-9

REMOVING THE OUTER CABINET

IMPORTANT: When you work on the microwave

oven, be careful when handling the sheet metal
parts. Sharp edges may be present, and you
can cut yourself if you are not careful.

1. Unplug microwave oven or disconnect power.

2. Remove the air grille (see page 4-4).

7. After removing all the screws, pull each side
out and push it back from the front corners of
the unit to release the tabs on the inside front
edge of the cabinet.

8. The cabinet may now be completely removed
from the unit.

3. Remove the 8 screws visible on the top of the
microwave unit.

4. Remove the 1 screw visible on the side.

5. Remove the 9 screws around the edge of the
back panel.

6. Remove the 3 screws on each end of the bot­tom panel (not shown).

9. CAUTION: Discharge the high-voltage ca­pacitor with a 20,000 Ohm resistor to chassis
ground.

4-10

REMOVING THE THERMOSTATS AND THERMISTOR

IMPORTANT: When you work on the microwave

oven, be careful when handling the sheet metal
parts. Sharp edges may be present, and you
can cut yourself if you are not careful.

To remove the magnetron thermostat:

1. Remove 2 screws and disconnect the wire
connectors.

Wire

Connectors

Screws

To remove the Cavity thermostats:

1. Unplug microwave oven or disconnect power.

2. Remove the outer cabinet (see page 4-10).

3. CAUTION: Discharge the high-voltage ca­pacitor with a 20,000 Ohm resistor to chassis
ground.

Magnetron

thermostat

Cavity

thermostat 2

Cavity

thermostat 1

1. Slide the thermostat up and out from behind
the mounting bracket. Remove the wire con­nectors.

Wire

Connectors

To remove the NTC thermistor (base thermis-

tor):

1. Remove one screw and remove the connection
at P4 of the microcomputer board (see illustra­tion on page 4-4).

NTC

thermistor

4-11

REMOVING THE MAGNETRON

IMPORTANT: When you work on the microwave

oven, be careful when handling the sheet metal
parts. Sharp edges may be present, and you
can cut yourself if you are not careful.

1. Unplug microwave oven or disconnect power.

2. Remove the outer cabinet (see page 4-10).

6. Remove the four T-20 Torx® screws that se­cure the magnetron to the unit and remove the
magnetron.

3. CAUTION: Discharge the high-voltage ca­pacitor with a 20,000 Ohm resistor to chassis
ground.

4. Remove 3 screws that secure the air shroud
and 1 screw that secures the ground wire. Lift
the air shroud up to expose two of the four
screws that secure the magnetron to the unit.

5. Remove 2 wire connectors from the thermostat
and 2 wire connectors from the magnetron
terminals.

4-12

REMOVING THE HIGH-VOLTAGE TRANSFORMER

IMPORTANT: When you work on the microwave

oven, be careful when handling the sheet metal
parts. Sharp edges may be present, and you
can cut yourself if you are not careful.

1. Unplug microwave oven or disconnect power.

5. Remove the 2 wire connectors on the front, 1
wire connector from the magnetron and 2 wire
connectors from the capacitor.

2 Wire

Connectors

1 Wire

Connector

2. Remove the outer cabinet (see page 4-10).

3. CAUTION: Discharge the high-voltage ca­pacitor with a 20,000 Ohm resistor to chassis
ground.

4. Remove the 4 screws from below the trans­former that secure it to the microwave unit.

2 Wire

Connectors

4-13

REMOVING THE HIGH-VOLTAGE DIODE AND CAPACITOR

To remove the High-Voltage Capacitor:

1. Unplug microwave oven or disconnect power.

2. Remove the outer cabinet (see page 4-10).

3. CAUTION: Discharge the high-voltage ca­pacitor with a 20,000 Ohm resistor to chassis
ground.

IMPORTANT: When you work on the microwave
oven, be careful when handling the sheet metal
parts. Sharp edges may be present, and you
can cut yourself if you are not careful.

1. Unplug microwave oven or disconnect power.

2. Remove the outer cabinet (see page 4-10).

3. CAUTION: Discharge the high-voltage ca­pacitor with a 20,000 Ohm resistor to chassis
ground.

4. Remove one screw to remove the diode. Dis­connect one wire connector from the capacitor.

4. Remove one screw and slide the tab out from
the slot in the unit.

5. Disconnect the wire connectors and remove
the capacitor from the unit.

Tab

Screw

High Voltage

Diode

Screw

4-14

REMOVING THE OVEN CAVITY LAMP SOCKET

IMPORTANT: When you work on the microwave

oven, be careful when handling the sheet metal
parts. Sharp edges may be present, and you
can cut yourself if you are not careful.

1. Unplug microwave oven or disconnect power.

2. Remove the outer cabinet (see page 4-10).

7. Twist the lamp socket to release it from the one
tab on the left side.

8. Remove the two wire connectors and remove
the lamp socket from the unit.

Tab

3. CAUTION: Discharge the high-voltage ca-

pacitor with a 20,000 Ohm resistor to chassis
ground.

4. Remove the oven cavity lamp (see page 4-8).

5. Remove the capacitor (see previous page).

6. Remove one screw that secures the oven cav­ity lamp socket to the unit.

Screw

4-15

REMOVING THE AC LINE FILTER

6. When reinstalling the wire connectors to the

AC line lter, install the following wires to the

following connection spades:

1. Black AC line in

2. White AC line in

3. Black

IMPORTANT: When you work on the microwave
oven, be careful when handling the sheet metal
parts. Sharp edges may be present, and you
can cut yourself if you are not careful.

1. Unplug microwave oven or disconnect power.

2. Remove the outer cabinet (see page 4-10).

3. CAUTION: Discharge the high-voltage ca­pacitor with a 20,000 Ohm resistor to chassis
ground.

4. Remove 3 screws that secure the AC line lter
to the unit. Slide the AC line lter and bracket

out from under the tab to remove it.

5. Disconnect the 5 wire connectors from the AC

line lter.

4. Blue

Green Ground

3

1

Ground

2

4

AC Line

Filter

4-16

REMOVING THE HOOD FAN MOTOR AND HUMIDITY SENSOR

To remove the humidity sensor:

1. Unplug microwave oven or disconnect power.

2. Remove the outer cabinet (see page 4-10).

3. CAUTION: Discharge the high-voltage ca­pacitor with a 20,000 Ohm resistor to chassis
ground.

IMPORTANT: When you work on the microwave
oven, be careful when handling the sheet metal
parts. Sharp edges may be present, and you
can cut yourself if you are not careful.

1. Unplug microwave oven or disconnect power.

2. Remove 2 screws from the top of the micro­wave oven that secure the cover plate to the
outer cabinet. Lift the front of the cover plate
and pull the tabs out of the slots at the back of
the unit.

3. Remove 2 screws from the back of the unit that
secure the hood fan motor assembly to the
unit.

4. Remove the hood fan motor. (See left column)

5. Remove the 2 screws that secure the Humidity
sensor to the unit. Disconnect the wire con­nector at P1 on the microcomputer board (see
illustration on page 4-4).

Hood fan

motor wiring

connector

4. Pull the hood fan motor assembly up and out
of the top of the unit. Disconnect the wiring
connector to remove the assembly.

Humidity

Sensor

4-17

REMOVING THE FUSE HOLDER & MOUNTING BRACKET

4. Remove the control panel (see page 4-4, steps
2 - 5).

5. Remove the wires from the retainer on the top
of the fuse holder mounting bracket.

6. Remove the 2 wire connectors from the fuse
holder.

IMPORTANT: When you work on the microwave
oven, be careful when handling the sheet metal
parts. Sharp edges may be present, and you
can cut yourself if you are not careful.

1. Unplug microwave oven or disconnect power.

2. Remove the bottom cover (see page 4-2, steps
1-3).

3. Remove the 2 screws near the front right cor­ner of the bottom of the unit.

7. Pull the assembly out of the microwave unit.

8. Remove the fuse from the holder.

9. Remove 1 screw in the bottom of the fuse
holder to remove the holder (not shown in
photo. Only visible when fuse is removed).

4-18

Wire

Retainer

Fuse

holder

2 Wire

connectors

Mounting

bracket

REMOVING THE DOOR AND DOOR DISASSEMBLY

Components of the MHC door (in order of

removal.):

1. Choke Seal

2. Inner Door

3. Handle

4. Door Bracket

5. Outer Glass

6. Door Frame

1

2

IMPORTANT: When you work on the microwave

oven, be careful when handling the sheet metal
parts. Sharp edges may be present, and you
can cut yourself if you are not careful.

1. Unplug microwave oven or disconnect power.

2. Remove the air grille (see page 4-4,
steps 2 & 3).

3. Remove the 1 T-10 Torx® screw from the top
hinge of the door.

4. Lift the door up and off the other hinge to re­move the door.

5. Place the door face down on a protective sur­face. (All removal procedures assume the door
is face down with the handle to the left.)

5

4

3

6

Choke seal removal:

1. There are 4 tabs on the top edge, 3 tabs on
each side and 5 tabs on the bottom edge.

2. Use a putty knife to open the gap between the
door frame and the choke seal.

3. Locate each tab and use a at blade screw­driver to gently lift the choke seal and release
each tab. Place the screwdriver in the slot direct­ly beside each tab and lift from there.

4. Only lift enough to release each tab all the way
around the choke seal to avoid bending and pos­sibly breaking the choke seal.

Putty
Knife

Tab

Screwdriver

4-19

Inner door removal: This shows the screw loca-

tions for each labeled component at the top of
the door bracket. The same screws are at the
bottom of the bracket, in reverse order.

Door bracket

Inner door

Handle

2. Beginning at the bottom left corner, work your

way across the bottom edge to release 4 tabs.
Release 3 tabs on the right edge and 2 tabs on
the left edge.

Door bracket removal:

1. Remove two screws that secure the door
bracket to the door frame. Refer to the photo in
the left column for screw location.

Door Latch Removal:

1. After removing the Inner door, turn it over.

2. Each door latch is secured with one screw.
Remove the screw and slide the latch out of the
slot in the inner door.

3. Gently lift the inner door from the bottom edge

to release the 4 clips along the top edge.

Handle removal:

1. Remove two screws from the door bracket that

secure the handle to the front of the door. Refer
to the photo at the top of this column for screw
location.

2. The handle can be replaced without regard for

orientation of top and bottom.

Outer glass removal:

1. Press the 5 tabs at the top edge of the outer
glass that secure it to the door frame.

2. Lift the glass at the top left corner just enough
to slide the glass to the left and up from under the
tabs on the right and bottom edges.

Slide out

from under

Press tabs

4-20

COMPONENT TESTING

Important

Before testing any of the components, perform

the following checks:

• Unplug microwave oven or disconnect power.

• Remove the lead wires from the related com­ponent before conducting any of the following
tests.

H.V. TRANSFORMER

• Discharge the high-voltage capacitor and
remove the lead wires from the primary winding
of the high-voltage transformer before conduct­ing any of the following tests.

• All operational checks using microwave
energy must be done with the microwave oven
loaded with a minimum of 8 oz (250 mL) of wa­ter in a microwave safe container.

• Conduct a microwave energy test after per­forming any tests or repairs to the microwave
oven.

• Check that all wire leads are in the correct
positions before operating the microwave oven.

• Grasp wire connectors when removing the
wire leads from microwave oven parts.

• All testing must be done with an ohmmeter
having a sensitivity of 20,000 ohms per volt DC
or greater, and powered by at least a 9-volt bat­tery

1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance (ohmmeter scale: Rx1):

• Primary winding: Less than 0.5 ohm (approxi­mate)

• Secondary winding: 80 ohms (approximate)

• Filament winding: 0 ohms

4. Measure resistance (ohmmeter scale: Rx1k):

• Primary winding to grounding: Normal: Innite

• Filament winding to grounding: Normal: Innite

Filament (black & red)

Secondary

(white wire,

ground to trans-

former case)

Red Tube

Black Tub e

White

Tube

5-1

Primary

(terminals)

MAGNETRON

H.V. CAPACITOR

1. Unplug microwave oven or disconnect power.

2. Remove wire leads. Check that the seal is in
good condition.

3. Measure resistance (ohmmeter scale: Rx1):

• Filament terminal: Normal: Less than 1 ohm

4. Measure resistance (ohmmeter scale: Rx1k):

• Filament to chassis: Normal: Innite

Filament

Terminals

1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance (ohmmeter scale: Rx10k):

• Terminal to terminal: Normal: Momentarily indi­cates several ohms, and then gradually returns

to innite.

• Terminal to case: Normal: Innite

Magnetron

F

FA

5-2

H.V. DIODE

TURNTABLE MOTOR

NOTE: Some inexpensive meters may indicate

innite resistance in both directions.

1. Unplug microwave oven or disconnect power.

2. Measure resistance (ohmmeter scale: Rx1k):

• Forward: Normal: Continuity; Abnormal: Innite

• Reverse: Normal: Innite; Abnormal: Continuity

1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance (ohmmeter scale: Rx1k):

• Turntable Motor—Normal: 2.7k-3.8k ohms (ap-

proximate); Abnormal: Innite

Cathode

Anode

TTM

5-3

HUMIDITY SENSOR

HOOD EXHAUST FAN MOTOR

1. Unplug microwave oven or disconnect power.

2. Remove the 3-pin connector from the elec­tronic control (P1). NOTE: Do not remove the
attached resistor, which is used for internal
resistance calibration.

3. Measure resistance across pins 1 & 3, and
across pins 2 & 3 (ohmmeter scale: Rx1k):

• Normal: 2.8k ohms (approximate) at 77ºF
(28ºC) +/- 18ºF (-10ºC)

• Abnormal: Innite

1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance (ohmmeter scale: Rx1):

• High Speed—Normal: Red (R) and Blue (BU)
wires: 100-200 ohms (approximate); Blue (BU)
and Black (BK) wires: 40-100 ohms (approxi-

mate) ; Abnormal: Innite

• Low Speed—Normal: Red (R) and Blue (BU)
wires: 100-200 ohms (approximate); Blue (BU)
and White (W) wires: 80-150 ohms (approxi-

mate); Abnormal: Innite

1

BK

R

W

BK

W

HF

BU
Y

R

5-4

AC LINE FILTER

THERMOSTATS

1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance (ohmmeter scale: Rx1):

• Normal: 1-3 (coil): Less than 1 ohm; 2-4 (coil):
Less than 1 ohm; 3-4 (resistor): 550k-800k
ohms

• Abnormal: Innite

1

2

4

3

1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure continuity (ohmmeter scale: Rx1)

• Cavity and Magnetron Thermostats—

Normal: Continuity; Abnormal: Innite

• Magnetron thermostat opens at 257ºF (125ºC),
closes at 185ºF (85ºC)

• Cavity thermostat 1 opens at 257ºF (125ºC),
closes at -31ºF (-35ºC)

• Cavity thermostat 2 opens at 257ºF (125ºC),
closes at -31ºF (-35ºC)

L

GND

N

BK

G

W

1

2

Ground

L

R

Cx

L

3

Cy

Cy

4

5-5

---- NOTES ----

5-6

Primary
Interlock

DIAGNOSIS & TROUBLESHOOTING

INTERLOCK SWITCH CHECKOUT PROCEDURES

1. Unplug microwave oven or disconnect power.

2. Disconnect the wires at the Primary Interlock Switch.

3. Check from the common terminal (black/brown wires) to the

normally open terminal (black/white wires).

1. Unplug microwave oven or disconnect power.

2. Disconnect the wires at the Primary Interlock Switch.

3. Check from the common terminal (black/brown wires) to the

normally closed terminal (orange wire).

- +

+ -

desolC rooDnepO rooDyB kcehChctiwS

Secondary
Interlock

Monitor
Interlock

(+) Continuity (-) No Continuity

NOTE: These diagrams are not intended to show a complete circuit; they represent the position of switches during “DOOR
OPEN” or “DOOR CLOSED” (continuity checks only).

1. Unplug microwave oven or disconnect power.

2. Disconnect the wires at the Secondary Interlock Switch.

3. Check from the common terminal (blue/white wires) to the

normally open terminal (blue wires).

1. Unplug microwave oven or disconnect power.

2. Disconnect the wires at the Monitor Interlock Switch.

3. Check from the common terminal (white wire) to the normally

closed terminal (blue/white wires).

- +

+ -

nepO rooDdesolC rooD

(NO)

N

(NC)

Primary

Interlock

Switch

(NO)

(NO)

Monitor

Interlock

Switch

(NC)

(NC)

Secondary

Interlock

Switch

NL

(NO)

L

(NC)

Primary

Interlock

Switch

(NO)

(NO)

Monitor

Interlock

Switch

(NC)

(NC)

Secondary

Interlock

Switch

TROUBLESHOOTING

Do not continue with the diagnostics of appliance if the
household fuse is blown, a circuit breaker is tripped or if there
is less than 120-volt power supply at the wall outlet.

Complete the following steps before checking microwave
oven circuitry:

1. Unplug microwave oven or disconnect power.

2. Check for loose wiring or incorrect wiring within
microwave oven.

3. Disconnect white wire from power transformer and
discharge high-voltage capacitor.

4. All testing must be done with an ohmmeter having a
sensitivity of 20,000 ohms per volt DC or greater, and
powered by at least a 9-volt battery.

5. All operational checks using microwave energy must be
done with the microwave oven loaded with a minimum of
8 oz (250 mL) of water in a microwave safe container.

6-1

TOUCH PANEL AND ELECTRONIC CONTROL TEST

Touch Panel and Electronic Control Test

The microwave hood combination is provided with a self-diagnostic routine that can be accessed through the touch keypad.

To initiate this routine:

1. Press and hold the OFF/CANCEL button while opening
the door. While still holding the OFF/CANCEL button,
unplug the microwave oven for 2 seconds, then plug it
back in.

2. Release the OFF/CANCEL button and close the door. All
VFD segments will be lit to indicate the test mode has
been entered.

NOTE: If the OFF/CANCEL button is pressed during this
diagnostic routine, you will exit the test mode.

Key Tables for Test Mode

Key Name Function Display Buzzer

peeb 11 yeK-tratS

Light Hi/Lo/Off - Key 3 1 beep

Hood Exhaust Fan
(HF) Hi/Med/Lo/
Off

- Key 4 1 beep

Turntable On/Off - Key 5 1 beep

Clock - Key 6 1 beep

Timer Set/Off - Key 7 1 beep

Add 30 Sec - Key 9 1 beep

Cook Time - Key 10 1 beep

Cook Power - Key 11 1 beep

Warm Hold - Key 12 1 beep

Cook - Key 13 1 beep

Reheat - Key 14 1 beep

Defrost - Key 15 1 beep

Frozen Entrée - Key 16 1 beep

Beverage - Key 17 1 beep

Popcorn - Key 18 1 beep

Baked Potato - Key 19 1 beep

Frozen Vegetable - Key 21 1 beep

Fresh Vegetable - Key 22 1 beep

Key Name Function Display Buzzer

peeb 123 yeK-0

1

Cavity Light
On—Relay
4901

Key 33 1 beep

2

Cooktop Light
On (High)—
Relay 4911

Key 34 1 beep

3

Microwave
Oven On for
10 Seconds—
Relay 4903

Key 35 1 beep

peeb 163 yeK-4

peeb 173 yeK-5

6

Cavity Light &
Turntable On—
Relay 4901
&4906

Key 38 1 beep

peeb 193 yeK-7

8

Cooktop Light
On (Night)—
Relay 4912

Key 40 1 beep

9

HF On (High
Speed)—
Relay 4902 &
Triac 7104

Key 41 1 beep

Off/Cancel (to
lock hold, hold
for 3 seconds)

Exit Test Mode - 1 beep

6-2

MICROWAVE OVEN POWER OUTPUT TEST

1. Place 8 oz (250 mL) of lukewarm water in the center of the
microwave oven.

2. Operate on HIGH power level for 2 minutes. Water
should be hot.

NOTE: If the water takes longer than 2 minutes to heat,
this may indicate either the operating voltage is lower
than 110 volts or there is a problem with the microwave
oven.

FAILURE CODES INDICATIONS

Display Likely Failure Condition Recommended Repair Procedure

Flashing
colon “:”

F2 Touch panel failure 1. Unplug microwave oven or disconnect power.

F3H Humidity sensor failure 1. Unplug microwave oven or disconnect power.

Power failure After a power failure, the colon “:” will be flashing. Press any key to end this

indication. The colon will then be steady when in standby.

2. Replace touch panel.

3. Plug in microwave oven or disconnect power.

4. If problem persists, unplug microwave oven or disconnect power.

5. Replace electronic control.

6. Plug in microwave oven or reconnect power.

2. Connect a new sensor to the electronic control (at P1).

3. Plug in microwave oven or reconnect power.

4. If problem persists, unplug microwave oven or disconnect power.

5. Replace electronic control.

6. Plug in microwave oven or reconnect power.

F6 Microwave relay failure 1. Unplug microwave oven or disconnect power.

2. Check wiring to Relay 4903 for short circuits.

3. If wiring is OK, replace electronic control.

4. Plug in microwave oven or reconnect power.

6-3

---- NOTES ----

6-4

WIRING DIAGRAM & STRIP CIRCUITS

AC Line Filter

1

BK

L

3

L

GND

G

N

W

2

L

R

Cy

Cy

Cx

32Y/G

1

BK

3BR

Moni tor

Inte rlock

Swit ch

Fuse

20

2

BK

Primary

Interlock

Switch

4OR

6 B K

5W

El ectron i c Contr o l

7 BR

MW-R elay

4903

2 1

Red Tub e

Blac k T ub e

Whit e

Tube

R

C

H.V. Capac itor

H.V. Diode

3

3K

1

2

GND

Sec.

L.V.

Transformer

Pri.

33

K

6

8

K

HF NTC

HL Relay

4912

H

L

Relay

4

9

1

1

Diod e

6101

HF Triac

7104

HF Relay

4902

HL

HF1

HF2

Doo r

N1

NFS

CL

Rela y

4901

TTM

Rela y

4906

TTM

CL

L

18

R

19

W

17

R

1P5

CL

16

GY

11

W

2P5

22W

26W

10BU

27Y

28R

25BK

5P6

1P6

BK

B

U

R

Y

W

15Y

5P5

(Golden

tab)

(White

tab)

P2

P3

1

20

R

HL

21W

13BU

14

G

4P5

30Y/

G

Magn et ron

F

FA

31

R(

HV

)

H.V.

Tran sf orm er

Magnet ro n

Thermo st at

29W

24BU

HF

Seco nd ar y

Inte rl ock

Swit ch

23BU

12W

TTM

Condition: Door

Open

Symbol Notes

Cavi ty Lam p

Turn table Motor

TTM

BUWBK

Y

R

HF

Hood Ex haust

Fan M ot or

DWG NO. MU-0 76

P1/P 2/ P3/P4 /P 5/ P6: Co nne ctors

R: Red

Y: Yell ow

OR: Ora ng e

W: White

G: Gre en

GY: G ra y

BR: Br ow n

BU: Bl ue

BK: Bl ac k

1

BK

Wire NO. -1

Wire Col or-Bl ac k

Moto r

Capa citor

CL

Hood (Cook top) L amp

HL

1

P1

Humi dity

Sens or

Amp

BK

R

W

4

8B

U

TTM

9BU

Cavity

Thermostat 1

33

BK

Cavity

Ther mos tat 2

P4

AC 120 V/1 25V 60H z

HF NTC

P4

(White

tab)

(Golden

tab)

1

WIRING DIAGRAM - 8205889 - SENSOR MODEL

7-1

AC Li ne Fil te r

1

BK

L

3

L

GND

G

N

W

2

L

4

R

Cy

Cy

Cx

32 Y/G

1

B

K

8

B

U

3

B

R

Moni tor

Inte rlo ck

Swit ch

Fuse

20Am p

2BK

Prim ary

Inte rlo ck

Swit ch

4OR

6BK

5W

Elec tro nic C ontrol

7BR

MW-Rel ay

4903

2 1

Red Tub e

Blac k T ub e

White

Tube

R

C

H.V. Ca pacit or

H.V. Di ode

3

3

K

1

2

GND

Sec.

L.V.

Tra ns forme r

Pri.

3

3

K

68

K

Hood

Thermi st or

HL

Rela y

4911

Diode

6101

HF R el ay

4905

HF Rel ay

4902

HL

HF1

HF2

Doo r

N1

NFS

CL

Rela y

4901

TTM

CL

L

1

8

R

1

9

W

1

9

W

17

R

1P5

CL

1

6

G

Y

1

1

W

2P5

22 W

26 W

10

BU

27

Y

28 R

25B

K

5P6

1P6

BK

BU

R

Y

W

15 Y

5P5

(Golde n

tab)

(White

tab)

P2

P3

1

20R

HL

21W

1

3B

U

14

G

4P5

30Y

/

G

Magn et ron

F

FA

3

1

R

(

H

V

)

H.V.

Transf or mer

Magnet ro n

Thermo st at

29W

24BU

HF

Second ar y

Interl oc k

Switch

23 BU

12 W

TT

Condition: Door Opened.

Symbol Notes

Cavi ty Lamp

Turn ta ble Mo to r

TT

BU

W

BK

Y

R

HF

Hood Ex haust

Fan M ot or

DWG N O. MU-079 ( Rev. A)

P2/P 3/ P4/P5 /P 6: Con ne ctors

R: Red

Y: Y ell ow

OR: Or an ge

W: White

G: Gre en

GY: G ray

BR: Br ow n

BU: Bl ue

BK: Bl ac k

1

BK

Wire NO. -1

Wire Col or-Bl ac k

Motor

Capacitor

CL

Hood (C ookto p) Lamp

HL

1

33 B K

9

BU

Cavity

Thermostat 1

Cavi ty

Thermostat 2

(Golde n

tab)

(White

tab)

HL

Rela y

4912

AC 120 V/ 12 5V 6 0H z

P4

WIRING DIAGRAM - 8205660 - NON SENSOR MODEL

7-2

STRIP CIRCUITS

MICROWAVE COOKING

Elec tr oni c C ontro l
L.V.

P1

1

Tran sf ormer

MW Re la y

4903

TTM R el ay

4906

CL Re la y

4901

HF Tria c

7104

HF Re la y

4902

1P3

1

7P2

6P2

2P2

4P2

R

Cavi ty

Lamp

Tran sf ormer

BR

1P5

GY

Moto r Capac itor

BR

5P2

OR

3P2

BK

2

Humi dity

Sens or

BK

R

W

BK

Fuse

20AM P

BK

Prim ar y

Inte rl ock

Swit ch

L

Filt er

BK

BK

Cavi ty

Ther mo stat 2

G

H.V.

Turn ta ble

Moto r

R

TT

CL

4P5

Magn et ron

Ther mo stat

W

W

2P5

1P6

BK

W

BU

Y

R

BU

BK
W

BU

Y

R

5P6

Seco nd ary

Inte rl ock

Swit ch

BU

BU

W

HF

Ther mo stat 1

W

BU

Cavi ty

BU

N

Filt er

W

HOOD EXHAUST FAN ON HIGH AUTOMATICALLY

Cavi ty

Filt er

Ther mo stat 2

BK

BK

Fuse

20 Amp

BK

BR

5P2

L

BK

Elec troni c Cont rol

L.V.
Tran sform er

HF Tria c
7104

P4

HF NT C

HF Re lay

4902

1P3

2P2

Moto r

G

Capa citor

4P5

BK

BU

Y

R

BU

W
1P6

5P6

BK

BU

Y

R

HF

Cavi ty

Ther mosta t 1

W

BU

BU

N

Filter

W

HOOD EXHAUST FAN ON LOW SPEED

L

BK

Filt er

Cavi ty

Ther mosta t 2

BK

BK

Fuse

20 Amp

BK

BR

5P2

Elec troni c Co nt rol

L.V.
Tran sform er

HF Tria c
7104

HF Re lay

4902

1P3

4P2

4P5

G

Moto r

Capa citor

W

BU
Y

W

R

2P6

5P6

BU

W

BU

HF

Y

R

Cavi ty

Ther mosta t 1

W

BU

BU

N

Filt er

W

7-3

HOOD EXHAUST FAN ON HIGH / MEDIUM

L

BK

Filt er

Cavi ty

Ther mo stat 2
BK

BK

Fuse

20 Amp

BK

BR

5P2

Elec troni c Co nt rol

L.V.
Tran sform er

HF Tria c
7104

HF Re lay

4902

1P3

2P2

4P5

G

Moto r

Capa citor

BK

BU

Y

R

W

1P6

5P6

BU

BK

BU

Y

R

HF

Cavi ty

Ther mosta t 1

W

BU

BU

Filt er

MICROWAVE OVEN PLUGGED IN—TIME OF DAY DISPLAYED

Elec tro nic Co ntr ol

L.V.
Tran sform er

1P3

4P5

G

BU

W

Cavi ty

Ther mos tat 1

Filt er

BU

BK

Fuse

20 A mp

BK

BR

5P2

L

Filt er

BK

BK

Cavi ty

Ther mosta t 2

DOOR OPEN—OVEN CAVITY LIGHT IS ON

Elec tro nic Co ntr ol

L.V.

BR

5P2

BK

Fuse

20 Amp

BK

Prim ary

Inte rlo ck

Swit ch

L

Filt er

BK

BK

Cavi ty

Ther mosta t 2

OR

3P2

Tran sform er

CL Re lay

4901

1P3

6P2

GY

4P5

G

CL

Cavi ty
Lamp

BU

W

Cavi ty

Ther mosta t 1

W

BU

BU

Filt er

N

W

N

W

N

W

COOKTOP LIGHT ON HIGH

L

BK

Filt er

Cavi ty

Ther mosta t 2

BK

BK

Fuse

20 Amp

BK

BR

5P2

Elec tro nic Contr ol

L.V.
Tran sform er

HL Re lay

4911

1P3

1P2

Cavi ty

Ther mos tat 1

W

BU

Filt er

R

4P5

W

HL

Hood

Lamp

BU

G

5P5

Y

N

W

COOKTOP LIGHT ON LOW (NIGHT LIGHT)

L

BK

Filt er

Cavi ty

Ther mosta t 2
BK

BK

Fuse

20 Amp

BK

BR

5P2

Elec tro nic Contr ol

L.V.

Tran sform er

HL Re lay

4912

Diod e
6101

Cavi ty

1P3

1P2

G

5P5

Y

R

(Coo kto p) L amp

W

HL

Hood

4P5

BU

Ther mos tat 1

W

BU

Filt er

N

W

7-4

PRODUCT SPECIFICATIONS

AND

WARRANTY INFORMATION SOURCES

IN THE UNITED STATES:

FOR PRODUCT SPECIFICATIONS AND WARRANTY INFORMATION CALL:

FOR WHIRLPOOL PRODUCTS: 1-800-253-1301
FOR KITCHENAID PRODUCTS: 1-800-422-1230
FOR ROPER PRODUCTS: 1-800-447-6737

FOR TECHNICAL ASSISTANCE WHILE AT THE CUSTOMER’S HOME CALL:

THE TECHNICAL ASSISTANCE LINE: 1-800-253-2870

HAVE YOUR STORE NUMBER READY TO IDENTIFY YOU AS AN

AUTHORIZED SERVICER

FOR LITERATURE ORDERS:

PHONE: [phone]

FOR TECHNICAL INFORMATION AND SERVICE POINTERS:

www.servicematters.com

IN CANADA:

FOR PRODUCT SPECIFICATIONS AND WARRANTY INFORMATION CALL:

1-800-461-5681

FOR TECHNICAL ASSISTANCE WHILE AT THE CUSTOMER’S HOME CALL:

THE TECHNICAL ASSISTANCE LINE: 1-800-488-4791

HAVE YOUR STORE NUMBER READY TO IDENTIFY YOU AS AN

AUTHORIZED SERVICER