Built-In Microwave Repairs

A built-in or over-the-range microwave does more than heat leftovers. Many also serve as your range hood, with a vent fan and cooktop light. When one stops working, you lose both functions, and replacing it is more involved than swapping out a countertop model.

Types of built-in microwaves

The term "built-in" covers a few setups:

• Over-the-range microwaves, mounted above the stove, usually with a vent fan and light.
• Wall-mounted or cabinet built-ins, set into cabinetry, sometimes paired with a wall oven.
• Drawer microwaves, installed under a counter or in an island.

Because these are installed, repairs or replacements often require a technician and sometimes help with mounting.

Common problems

Here's what tends to go wrong:

1. Microwave runs but doesn't heat. Possible causes include a failed magnetron, high-voltage diode, capacitor or door switch.
2. Won't start at all. Often a blown internal fuse or bad door switch.
3. Turntable doesn't spin. Usually the turntable motor or coupler.
4. Touchpad doesn't respond. The keypad or control board may be failing.
5. Sparking inside. Often from metal in the cavity or a damaged waveguide cover.
6. Vent fan or light not working. Fan motors, switches and bulbs can fail on over-the-range models.
7. Door won't latch. Worn latches or switches can prevent operation as a safety feature.

A safety warning

Microwaves contain a high-voltage capacitor that can hold a dangerous charge even after the unit is unplugged. Don't open the outer cabinet to troubleshoot internal parts yourself. Leave internal repairs to a qualified technician.

Things you can safely check:

• Whether the breaker has tripped.
• Whether the door closes fully and nothing is blocking it.
• Whether the turntable is seated correctly.
• Whether the vent filters are clogged with grease. Many can be removed and washed.
• Replacing the cooktop light bulb, following your owner's manual.

What to tell the technician. A clear description speeds up the repair and can save a second visit. Before you call, note:

• The brand, model and serial number, usually on a label inside the door frame.
• Exactly what happens: no power, no heat, strange noises, error codes on the display.
• Whether the problem is constant or comes and goes.
• How old the microwave is and whether it's had prior repairs.

Technicians often order parts based on the model number, so having it ready can help them bring the right part the first time.

Repair or replace?

Several factors go into this decision:

• Age of the unit. Older units may be near the end of their useful life.
• Cost of the failed part. A door switch or turntable motor is often a reasonable repair. A control board or magnetron costs more.
• Installation costs. Replacing an over-the-range unit includes removal, mounting and venting. That labor can make a repair more attractive.
• Fit. Built-in replacements need to match the cabinet opening and venting setup. Not every model fits the same space.

Ask the technician for a repair estimate and the expected life of the unit before deciding.

To keep it working longer:

• Clean spills promptly to prevent buildup and sparking.
• Wash or replace grease filters regularly on over-the-range models.
• Don't run the microwave empty.
• Use only microwave-safe containers.
• Close the door gently to protect the latches and switches.

How home warranties usually cover them

Many home warranty plans cover built-in microwaves as part of kitchen appliance coverage. Countertop models are usually excluded. Common terms include:

• Coverage for components like the magnetron, control board, switches and motors.
• Exclusions for interior linings, shelves, trim kits, lights and cosmetic parts.
• Per-appliance or per-claim coverage limits.
• Possible limits on installation costs if a replacement is needed.

For typical terms, see our built-in microwave coverage page and our oven and range coverage page.

If a replacement is approved, ask how installation is handled. Some plans pay for the unit but limit what they'll pay for removal, mounting or vent changes.

How Warranty Wizards can help

We help homeowners compare home warranty plans from third-party providers and explain how kitchen appliances like built-in microwaves are covered. We'll go over limits and exclusions before you buy. Request a free quote.