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Error code reference

Maytag Microwave Error Code Error 4

Door open when attempting to operate sensor program (Model MMC5080AA*).

Maytag codesMaytag microwave codes

Door open when attempting to operate sensor program (Model MMC5080AA*).

First step from the service manual

Close door, press PAUSE/CANCEL and restart.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What Error 4 means on a Maytag microwave

Error 4 on the Maytag MMC5080AA microwave indicates that the door was detected as open at the moment the user attempted to initiate a sensor cooking program. The sensor cooking system relies on a fully closed and latched door as a prerequisite before any cooking cycle can begin. This is a safety interlock condition rather than a component failure in most cases. The control board reads the door switch status before allowing sensor programs to activate, and if the switch signals an open door state, Error 4 is triggered immediately.

The door switch assembly in this model is responsible for communicating door position to the control board. Most microwave door assemblies use two or three interlock switches that must all confirm a closed state before high-voltage components are energized. If any of these switches is faulty, worn, or misaligned, the board may register an open door even when the door appears physically closed. Additionally, the door latch hooks that engage the switch actuators can wear down or break over time, preventing full mechanical engagement.

In many instances, this error is simply the result of the door not being fully pressed shut before the program was started. The fix in those cases is straightforward: close the door firmly, press PAUSE/CANCEL to clear the error, and restart the sensor program. If the error recurs consistently with a properly closed door, the issue likely points to a faulty door interlock switch or a damaged latch assembly that requires inspection and possible replacement.

Source: manufacturer service documentation.

Common causes of Error 4

  1. 01

    Door not fully latched at program start

    Wiring / connection

    The most frequent cause is simply that the door was not pressed completely shut before the sensor program was initiated. A firm push to ensure the latch clicks into place usually resolves this immediately.

  2. 02

    Worn or faulty door interlock switch

    Part replacement

    The door interlock switches signal the control board that the door is closed and safe to operate. A worn or failed switch may send an open-door signal even when the door is physically shut, causing Error 4 to appear repeatedly.

  3. 03

    Damaged or broken door latch hooks

    Part replacement

    The plastic latch hooks on the door engage the interlock switch actuators when the door closes. If these hooks are cracked or broken, they may not depress the switches fully, triggering the error.

  4. 04

    Misaligned door or hinge

    Wiring / connection

    A door that is out of alignment due to hinge wear or physical impact may not close squarely enough to engage the latch and switches properly. Check whether the door sits evenly in the frame when closed.

  5. 05

    Control board misreading door switch input

    Part replacement

    In rare cases, a faulty control board may incorrectly interpret the door switch signal as open even when all mechanical components are functioning correctly. This is typically diagnosed only after confirming that all switches and latches test properly.

See the test procedure for each cause

Frequently asked questions about Error 4

What does Error 4 mean on a Maytag microwave?
Error 4 on the Maytag MMC5080AA microwave means the door was detected as open when you attempted to start a sensor cooking program. The microwave requires the door to be fully closed and latched before it will allow a sensor program to run. This is a built-in safety condition that prevents the appliance from operating with an unsecured door. In many cases, simply closing the door firmly and pressing PAUSE/CANCEL will clear the error.
How do I fix Error 4 on my Maytag microwave?
Start by closing the door firmly until you hear the latch click, then press the PAUSE/CANCEL button to clear the error, and attempt to restart your sensor program. If the error returns consistently, inspect the door latch hooks for visible cracks or breaks and check whether the door closes squarely in the frame. A faulty door interlock switch is the next most likely cause and can be tested with a multimeter for continuity. Replacing a failed switch or latch assembly typically resolves the issue.
Is Error 4 on a Maytag microwave a safety concern?
Error 4 is itself a safety feature, not a safety hazard. The microwave is preventing operation because it cannot confirm the door is securely closed, which protects against microwave energy exposure. As long as the unit displays this error and refuses to run, it is behaving correctly. You should not attempt to bypass or override the door interlock system, as that would create a genuine safety risk.
Will resetting the microwave clear Error 4?
Pressing PAUSE/CANCEL is the correct reset step for Error 4 on this model, and it will clear the error display. However, if the underlying condition, such as an open or unlatched door, has not been resolved, the error will return as soon as you attempt to start a sensor program again. A persistent Error 4 after resetting points to a mechanical or electrical problem with the door latch or interlock switches that needs to be addressed.
How much does it cost to repair a Maytag microwave showing Error 4?
If the fix is simply closing the door properly, there is no cost involved. If a door interlock switch needs replacement, parts typically range from around $10 to $35 depending on the specific switch, with professional labor adding $50 to $150 or more depending on your area. A broken door latch assembly is similarly priced for parts, though labor costs apply if you use a technician. Evaluating whether repair cost is worthwhile compared to the age and replacement cost of the unit is always a reasonable consideration.

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