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MT4078SPB1
MT4078SPB1 Whirlpool Microwave - Overview
Sections of the MT4078SPB1
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Manuals & Care Guides for MT4078SPB1
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Installation Instructions
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Manual
Owner's Manuals
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Specs
Product Specifications Sheet
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Fastener Screw
PartSelect #: PS389896
Manufacturer #: 8169475
Sold individually.
No Longer Available
Door Interlock Switch Kit
PartSelect #: PS373050
Manufacturer #: 4392027
This part is a genuine manufacturer door interlock switch kit, also known as primary micro switch or microwave switch kit, for a microwave. The function of this part is to sense when the door of the m...
$85.78
In Stock
SCREW
PartSelect #: PS12728594
Manufacturer #: W11380570
Sold individually. For white and almond models.
$14.15
In Stock
Turntable Roller Guide
PartSelect #: PS11745256
Manufacturer #: WP8205178
This roller is located underneath the glass turntable. With the help of the motor, this roller helps to rotate the glass tray. This part takes the place of the coupling.
No Longer Available
Turntable Motor
PartSelect #: PS11749221
Manufacturer #: WPW10159107
This motor rotates the glass turntable in the microwave.
$118.69
In Stock
High-Voltage Diode Wire
PartSelect #: PS11745270
Manufacturer #: WP8205489
This part allows power to go only one way.
$55.64
In Stock
Turntable Cooking Tray
PartSelect #: PS11745251
Manufacturer #: WP8205098
This tray rotates in your microwave ensuring more even temperatures.
$92.27
In Stock
Microwave Screw
PartSelect #: PS11742285
Manufacturer #: WP4158079
This screw is for microwaves.
A qualified technician should install this part if it requires accessing internal components of the microwave or microwave door. High-voltage capacitors can retain a l...
$2.85
Special Order
Questions And Answers for MT4078SPB1
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Common Symptoms of the MT4078SPB1
[Viewing 4 of 4]Tray won’t turn
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Won’t turn on
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No heat
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Doesn’t shut off
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Keep searches simple. Use keywords, e.g. "leaking", "pump", "broken" or "fit".
Microwave worked intermittently depending on how door was closed
Remove top grille (2 screws), undo control panel (1 screw). Tilt down control panel, switches are on the left. There are actually three switches that are involved with the door, two horizontally mounted, one vertically mounted. This would be an EASY REPAIR, but it took me a while to figure out which of the three switches was bad, and a
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lso took a while to figure out that there is a plastic rod that inserts through the hole in the switch body. Once i figured this out went like a breeze. Lower horizontal switch was the bad one, but since the kit came with two switches i went ahead and replaced the upper horizontal one as well. IT appears that the horizontal switches are probably more likely to fail than the vertical switch based on the position of the switch and force angles. Works great now!
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Parts Used:
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Robert from Bainbridge Island, WA
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Difficulty Level:A Bit Difficult
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Total Repair Time:30 - 60 mins
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Tools:Pliers, Screw drivers
67 of 82 people
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Microwave went dead while in use.
1. removed vent across the top to gain excess to Screw holding control in place. 2. Removed control panel to access Fuse. 3. Remover fuse after pulling plug. 4.Tested fuse for continuity with volt ohm meter noting no continuity.5. Orderd new fuse. 6. receeived new fuse and installed infuse holder.7. plugged microwave plug back in receptic
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al and tested unit now working OK.Reversed steps 2 & 1 job complete
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Parts Used:
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Keith from Georgetown, TX
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Difficulty Level:Really Easy
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Total Repair Time:15 - 30 mins
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Tools:Pliers, Screw drivers
34 of 41 people
found this instruction helpful.
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Close the door on the microwave, punch in the # nothing happened
I removed the unit from the wall. Took the cover off. Set the unit on its side. It revealed the working parts. Removed the old micro switches. Put in the new oness. Presto, it worked. Very easy for me.
The parts was delivered almost before my notice they were shipped.
The parts was delivered almost before my notice they were shipped.
Parts Used:
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Robert S. from Stafford, TX
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Difficulty Level:Really Easy
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Total Repair Time:15 - 30 mins
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Tools:Screw drivers
15 of 22 people
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