Microwave Repair

Common Problems We See:

  • Runs but does not heat

  • Sparking / arcing inside the cavity

  • Control panel or keypad not responding

  • Turns off by itself / not turning on

  • Abnormal noises

  • Turntable-related problems

Got a microwave that won’t heat, sparks, shuts off unexpectedly, or has buttons that just won’t respond? Knapp’s Service & Appliance Repair in Portland, Oregon provides fast, reliable microwave repair and replacement to get your kitchen back on track. We diagnose and fix common microwave problems and give an honest recommendation. Repair when it makes sense to, replace when that is the better value. Quality workmanship, done right the first time. Book Knapp’s Service & Appliance Repair for trusted Portland microwave repair and replacement.

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Brands We Service:

  • GE

  • LG

  • Panasonic

  • Whirlpool

  • Toshiba

  • Samsung

  • Sharp

  • KitchenAid

  • Hamilton Beach

  • Commercial Chef

  • and more!

At Knapp’s Service & Appliance Repair, we diagnose and repair microwaves fast and reliably. You’ll get straight answers, expert work, and dependable fixes that restore proper heating and get your microwave working the way it should. Schedule an appointment today.

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Other Appliances We Can Help You With:

Outline of a refrigerator with a door handle on the left side and shelves inside, accompanied by the word 'REFRIGERATOR' below.
Icon of a washing machine with the word 'WASHER' below
Simple line drawing of a dishwasher with the word 'DISHWASHER' written below in blue.
Illustration of a range oven with the words "Range / Oven" beneath it.
Icon of a washing machine with the word 'DRYER' below it.

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Frequently Asked Questions About Microwaves

  • In many cases, repair is the better value. Especially for built-in or over-the-range microwaves and units that are under 7–10 years old. If the repair cost is high or the unit has multiple issues, replacement may make more sense. We’ll diagnose the problem and give you a clear repair vs. replace recommendation based on cost and condition.

  • This is one of the most common microwave complaints. It can be caused by a failed high-voltage component, a door safety switch issue, or control-related problems. Because microwaves contain high-voltage parts that can remain dangerous even when unplugged, professional diagnosis is the safest option.

  • Sparkarcing. Stop using the microwave to prevent further damage and schedule service so we can identify the cause.ing is often caused by metal or foil, a damaged waveguide cover, food debris/grease buildup, or interior damage from previous

  • No-power issues can be caused by a tripped breaker/GFCI, a blown internal fuse, a door switch problem, or a control failure. We’ll check the power supply and internal safety circuits to pinpoint the issue.

  • This can happen if the unit is overheating, if the door switches are failing, or if there’s a control or electrical issue. We’ll diagnose the cause and restore reliable operation.

  • Turntable issues are often caused by a misaligned tray, a worn coupler, a faulty turntable motor, or control problems. We can correct the cause so your microwave heats evenly again.

  • Grinding, buzzing, or rattling can come from the turntable system, fan, stirrer (model-dependent), or internal components. We’ll identify the source and recommend the right repair before the problem worsens.

  • Yes—many common microwave problems can be repaired when parts are available and the repair cost makes sense. We’ll always provide an honest recommendation based on the unit’s condition, age, and total repair cost.