Kenmore 79047842400 wall oven/microwave combo Parts

On the Kenmore 79047842400 wall oven/microwave combo, the microwave is built into the combination unit, so it is not designed to be swapped out as a separate “microwave-only” appliance. In practice, you either repair the microwave section or replace the entire combo unit; use the owner's manual to confirm the service and safety guidance for your exact configuration.

What you can do instead

• Repair the microwave section by diagnosing the failed component (common issues include door switches, controls, or the magnetron).
• Replace a specific microwave safety part if it is faulty (for example, a door interlock switch).
• If the microwave cavity, cabinet, or major assemblies are damaged, replacement of the full combo is typically the path forward.
• Use the troubleshooting section in the manual before ordering parts.

Parts that commonly affect microwave operation

If the microwave will not start, stops when the door moves, or acts like the door is open, these parts are frequent suspects:

• Microwave door interlock switch 5304493153
• Wall oven microwave electronic control board 5304440820
• Wall oven microwave magnetron 5304521745

Quick decision guide

Situation	Most likely next step	Why
Microwave dead, no heat, or intermittent	Diagnose and repair a component	Many failures are part-level (switch, control, magnetron)
Door must be held “just right” to run	Check/replace door interlock parts	Door safety circuit prevents operation
Major structural damage or multiple failures	Replace the combo unit	Built-in design limits “microwave-only” replacement

Why it matters

Combo units share a built-in frame, wiring, and controls; that integrated design is why the microwave section is usually serviced by replacing internal parts rather than replacing the microwave as a standalone module.

Last updated: February 2026

Yes. A wall oven microwave combo is a single built-in unit that stacks a microwave (upper) with a wall oven (lower) for a clean, space-saving installation. Your Kenmore model 79047842400 is a microwave/wall oven combination, as shown in the owner's manual.

What you get with a combo unit

A combo is designed to give you two cooking methods in one cabinet cutout, with separate controls and features for each oven cavity.

• Full-size wall oven baking and broiling in the lower oven
• Microwave cooking in the upper oven (with door latches and a turntable)
• Built-in look with a shared trim and frame
• Independent control pads (microwave controls and wall oven controls)
• Standard wall oven accessories such as adjustable racks and a broiler pan (varies by model)

Quick comparison: combo vs. separate appliances

Option	What it is	Best for
Wall oven microwave combo	One built-in unit with microwave over wall oven	Saving cabinet space and matching finishes
Separate wall oven + countertop microwave	Built-in oven plus a standalone microwave	Flexibility and easier microwave replacement
Separate built-in microwave + wall oven	Two built-in appliances installed separately	Premium layouts and independent sizing

Why it matters

A combo unit affects your kitchen planning and repairs because the microwave and wall oven share a single built-in chassis. When you troubleshoot heating, door issues, or controls, it helps to identify whether the problem is in the microwave section or the wall oven section.

Helpful next steps for owners

• Use the microwave section for quick heating and the wall oven for baking/roasting
• Confirm which features your specific unit has (manual-clean vs. self-clean varies by model)
• Follow the recommended rack positions and venting guidance
• If you are planning a replacement, verify cabinet cutout and electrical requirements before ordering

Last updated: February 2026

A Kenmore microwave in the 79047842400 wall oven/microwave combo can stop working when it loses power (outlet, breaker, fuse), the controls are locked up, or a door safety interlock problem prevents operation. Start with the simple power and door checks before suspecting internal parts.

Quick checks we recommend first

• Confirm the unit has power: check the kitchen outlet, house fuse, and circuit breaker.
• Press STOP/CLEAR once to reset the keypad logic.
• Make sure the door closes fully; do not use the microwave if the door, hinges, or latches are damaged.
• If the display countdown runs unusually fast, turn off Demonstration mode (steps are in the owner's manual).
• If the microwave runs but does not heat, stop using it and have it serviced by a qualified technician.

Common part-related causes

Door and safety interlock issues are a frequent reason a microwave will not start, will stop mid-cycle, or will act “dead” even though the display works.

• Door interlock switch failure: microwave door interlock switch 5304493153
• Interlock switch and fuse assembly issues: switch 5304468224
• Door release mechanism problems that keep the door from latching correctly: switch 5304485407

What the symptoms usually mean

Symptom	Most likely direction	What to do next
No display, no response	Power supply issue	Check breaker/outlet; then inspect wiring and terminal connections
Display works, won’t start	Door not latching or interlock fault	Inspect latch alignment; test/replace interlock switch
Runs but no heat	High-voltage system problem	Stop using; schedule qualified service
Odd behavior after opening/closing door	Control logic state	Press STOP/CLEAR; retry a normal cook cycle

Why it matters

Microwave door interlocks are a critical safety system. If the door does not close and latch correctly, the control prevents operation to reduce the risk of unsafe microwave energy exposure.

Last updated: February 2026