What microwave problems do we repair?
We repair heating faults, power and start problems, sparking, noise, door and turntable faults, and control faults on over-the-range and built-in microwaves.
| Symptom | Likely cause | What the technician does |
|---|---|---|
| Runs but does not heat | A failed magnetron, high-voltage diode, capacitor, or transformer (an inverter board on inverter models), a blown high-voltage fuse on models that have one, or a door switch that does not close | Checks the power level and settings, discharges the capacitor safely, tests the high-voltage parts, and replaces what failed. A shorted diode or capacitor is often replaced together with its partner, once the cause is found |
| Heats weakly or unevenly | A power level set low, a turntable that does not turn, or a weakening magnetron or diode | Checks the settings and the turntable, then tests the high-voltage parts |
| Dead, with no display | A blown fuse (often because a door switch failed), a tripped thermal cutout, a failed control board, or no power at the outlet | Checks the outlet and the breaker, then tests the door switches, the fuse, the cutout, and the board |
| Display works but it will not start | A door switch or latch that does not register the door as closed | Tests every door interlock switch and the door monitor switch, replaces the latch assembly or the failed switches as the service manual requires, and never bypasses an interlock |
| Shuts off in the middle of a cycle | Overheating from a blocked vent or a failed cooling fan, or a thermal cutout that trips | Checks the airflow, the cooling fan, and the cutout |
| Trips the breaker | A shorted high-voltage part such as a diode, a capacitor, or the magnetron, damaged wiring, or a circuit shared with other appliances | Leaves it off, tests the high-voltage parts and the wiring, and replaces what failed |
| Sparks or arcs inside | A damaged waveguide cover, a burned spot in the cavity, or a worn turntable support or rack | Inspects the cavity and the waveguide cover and replaces the damaged parts |
| Burning smell | Food burned onto the waveguide cover, or an overheating fan or transformer | Cleans or replaces the cover and checks the fan and the transformer |
| Loud humming or buzzing | A failing high-voltage transformer or diode, a worn cooling fan, or a worn magnetron | Isolates the noise to one part and replaces it |
| Grinding or rattling | A worn turntable motor, a broken roller ring or coupler, or a loose fan | Replaces the motor, the ring, or the coupler, or tightens the fan |
| Buttons or touch panel do not respond | A failed membrane switch or touch panel, or a failed control board | Tests the panel and the board and replaces the one that failed |
| Turntable does not turn | A failed turntable motor, a worn coupler, or a broken roller ring | Replaces the failed part |
| Door will not latch, or pops open | A broken door latch, release button, or hook, a worn door switch, or a bent door | Replaces the latch, the button, the hook, or the switch. If a bent door or a damaged seal cannot be restored properly, the microwave should not be used |
| Vent fan not working, or weak | A failed fan motor, clogged grease filters, or a stuck damper | Tests the motor, cleans the filters, and checks the damper |
| Light does not work | A burned-out bulb or a failed socket | Replaces the bulb or the socket |
The high-voltage capacitor in a microwave can hold a dangerous charge even when the unit is unplugged, so the outer cabinet stays closed for everyone but a technician, who discharges the capacitor before touching anything inside. Washing the grease filters needs only the fan switched off. For the charcoal filter, the glass tray, the roller ring, or the cooktop-light bulb, unplug the microwave (or switch its breaker off if it is hard-wired) and follow the manual. Open only the vent grille or lamp cover the manual names, and never remove the outer cabinet or any other screwed-on panel.
Which microwave types do we service?
We service over-the-range and built-in microwaves most often, and countertop models too. Reaching the parts of an over-the-range unit can mean lifting it off its wall bracket, so tell us which type you have when you book.
- Over-the-range microwaves with a built-in vent fan and light
- Built-in microwaves and trim-kit models, including combination units with a convection oven
- Microwave drawers
- Countertop microwaves, which can cost little more to replace than to diagnose, so we say up front whether a repair is worth it
We also remove and reinstall over-the-range microwaves for cabinet or countertop work. An over-the-range microwave doubles as the hood over the stove, and a separate range hood is repaired by the same team, as are the cooktop and the oven and range below it. We work on Samsung, LG, GE, Whirlpool, KitchenAid, Frigidaire, and other major brands.
How does a microwave repair visit work?
Choose an arrival window online or by phone, and a technician comes to your home. The microwave is tested, the failed part is found, and you receive a written estimate for the repair. Nothing is repaired until you approve it.
On a dead or non-starting microwave, the technician starts with the outlet, the fuse, and the door switches, and then tests the high-voltage parts. For an over-the-range unit, they may take it off the wall bracket to reach the parts, then rehang it on its mounting plate, fastened as the installation manual requires.
If the technician has the part with them, the repair is usually finished in the same visit. If it has to be ordered, you pick a time for the return visit.
Before the visit, empty the microwave and clear the counter or the stove under an over-the-range unit. Have the model number ready. It is usually on the door frame inside the cavity or on a side panel.
Should I repair or replace my microwave?
A repair is worth it when it costs well under half the price of a comparable new microwave. When it would cost more than about half, we tell you so and talk through whether it makes sense.
The National Association of Home Builders' 2007 life-expectancy study, an older but widely cited source, puts the typical life of a microwave at about 9 years. Over-the-range and built-in models cost much more to replace than countertop ones, and a new unit may need a different bracket, a trim kit, or a new cutout, so a repair is often worth pricing. Repair tends to make sense when:
- the microwave is over-the-range or built-in, and under about 7 years old
- the problem is a door switch, a latch, a fuse, a fan, a magnetron, or a control board
- the cavity is clean and not burned or rusted through
Replacement is usually the better call for a countertop model, because a basic one can cost little more than a diagnostic visit. It is also often the better call for a cavity that is burned through or rusted, or when the high-voltage parts and the control board are failing together.
What can I check before I book a microwave repair?
Quick checks
Take these in order, and stop at the first one that explains the problem.
- Check the breaker and any GFCI outlet that feeds the microwave, and on a countertop model plug a lamp or phone charger into the same outlet to see whether it has power. The microwave should plug straight into the wall, never into an extension cord, and the U.S. Fire Administration gives the same advice for major appliances.
- Make sure nothing is caught in the door seal and that the door closes with a click.
- Check that the glass tray and the roller ring sit properly on the turntable coupler.
- If it sparks, press Stop and do not run it again until you know why. Look for foil, metal trim, or a metal twist tie on a dish, and for a burned spot on the small panel on the cavity wall, which is the waveguide cover.
- Check that the power level is set to full and that the microwave is not in a demo mode, which your manual explains. Then run a microwave-safe cup of water for one minute and let it stand for 30 seconds before you lift it out, because very hot water can boil over when it is disturbed. If it is only lukewarm, the microwave is not heating.
- On an over-the-range unit, switch the fan off, let the filters cool, and wash the metal grease filters. If the microwave recirculates air instead of venting outside, replace the charcoal filter too.
- If the display shows an error code, write it down with the model number before you call.
Do not open the outer cabinet. If you see smoke or flames, keep the door closed, cut the power at the plug or the breaker only if you can do it safely, and call 911. If the flames do not die out at once, get everyone out of the house. If the breaker trips, leave it off. If you smell burning, stop using the microwave, cut its power, and call us.
What keeps a microwave running
Do not run a microwave empty, and cover food so it does not spatter. Wipe the cavity, and especially the waveguide cover, after spills. Wash the grease filters on an over-the-range unit once a month, and change a charcoal filter about every six months.
What does microwave repair cost?
A microwave visit starts with a diagnostic fee, which your service area sets and which is waived when you go ahead with the repair. After that you pay only for the repair you approve. Pick your area in the list of service areas above to see its fee and the labor prices for common microwave repairs.
The price of a repair is parts plus labor, and it varies with the part and your model. Door switches, fuses, and turntable parts are the smaller repairs, while a magnetron, a high-voltage transformer, or a control board costs more in parts. The price is confirmed in writing on site before any work starts.
Every repair comes with 90 days of labor coverage, so if our work fails in that time, we come back and redo the labor at no charge. Parts have their own coverage, which depends on the part and the supplier.
