Can’t find your part?   Contact us:
+1-309-603-4777
Sears Parts Direct
Orders

  • Keep track of the models you own in your profile

    Sign in or Register to view or add models

Schedule a repair
Whirlpool
Countertop Microwave

Model # MT4078SPQ3 Official Whirlpool microwave

Here are the diagrams and repair parts for Official Whirlpool MT4078SPQ3 microwave, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

  • Click a diagram to see the parts shown on that diagram.
  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

For DIY troubleshooting advice and repair guides, visit our repair help section.

Installation guide
Owner’s manual

Model diagram and schematic

SEARCH WITHIN THIS MODEL

?

This is the number corresponding to the part on the diagram / schematic

Search
ALL PARTS
Showing 10 of 57 parts  |
Switch 8183561
#3

Latch board parts diagram

Switch

Part #8183561

Replaced by #4392027

?
Manufacturer substitution
This part replaces 8183561. Substitute parts can look different from the original.
$69.11 | 
8% OFF Phone Price : $75.11
In Stock
Switch 8183562
#4

Latch board parts diagram

Switch

Part #8183562

Replaced by #4392027

?
Manufacturer substitution
This part replaces 8183562. Substitute parts can look different from the original.
$69.11 | 
8% OFF Phone Price : $75.11
In Stock
Screw 4358192
#6

Base plate parts diagram

Screw

Part #4358192

Replaced by #W11380570

?
Manufacturer substitution
This part replaces 4358192. Substitute parts can look different from the original.
This item is not returnable
$18.19 | 
10% OFF Phone Price : $20.19
In Stock
Turntable Motor 8184375
#8

Oven cavity parts diagram

Turntable motor

Part #8184375

The manufacturer no longer makes this part, and there's no substitute part

Fan Blade 8184292
#1

Oven interior parts diagram

Fan blade

Part #8184292

$36.16
In Stock
Electronic Control 8205473
#3

Control panel parts diagram

Electronic control

Part #8205473

Replaced by #WP8205473

?
Manufacturer substitution
This part replaces 8205473. Substitute parts can look different from the original.
$260.49
In Stock
Power Cord W10246260
#9

Oven interior parts diagram

Power cord

Part #W10246260

Replaced by #8206281

?
Manufacturer substitution
This part replaces W10246260. Substitute parts can look different from the original.
$46.16
In Stock
Screw 4358362
#10

Oven cavity parts diagram

Screw

Part #4358362

Replaced by #W11245710

?
Manufacturer substitution
This part replaces 4358362. Substitute parts can look different from the original.
This item is not returnable
$16.79 | 
11% OFF Phone Price : $18.79
In Stock
Capacitor W10246258
#4

Oven interior parts diagram

Capacitor

Part #W10246258

Replaced by #W10293696

?
Manufacturer substitution
This part replaces W10246258. Substitute parts can look different from the original.
$107.60
In Stock
Microwave High-voltage Diode 8205489
#8

Oven interior parts diagram

Microwave high-voltage diode

Part #8205489

Replaced by #WP8205489

?
Manufacturer substitution
This part replaces 8205489. Substitute parts can look different from the original.
$32.49 | 
16% OFF Phone Price : $38.49
In Stock

Effective articles & videos to help repair your microwaves

View all
5 Holiday Cleaning Tasks Essential to Boosting Your Home’s Image

5 Holiday Cleaning Tasks Essential to Boosting Your Home’s Image

Get tips on completing essential holiday cleaning tasks to brighten your home.…

Read more
Introducing new technical repair content that we’re developing for the Sears Technical Institute

Introducing new technical repair content that we’re developing for the Sears Technical Institute

Learn about Sears Technical Institute and the advanced technical content being developed for aspiring appliance techs.…

Read more
Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

Read more

Parts & More

Compact Refrigerator
LG Parts Compact refrigerator