Microwave repair
Two things are true about microwaves at once. Most countertop microwaves cost less than a service call plus the part, so repairing one rarely makes sense, and we will tell you that on the phone rather than charge you $89 to say it in your kitchen. Built-in, drawer and over-the-range microwaves are different: they are fitted to cabinetry, they cost far more to replace, and their faults are usually worth a proper diagnosis.
The other thing that is true is that a microwave is not a home repair. The cabinet contains a high-voltage capacitor that GE notes can hold a charge even after the microwave is unplugged. RepairWell technicians discharge and test that circuit with the right equipment; nobody else should open the cabinet.
Online booking is a request; we confirm a window by text or phone within 1 business hour.
Types and configurations we service
- Over-the-range microwaves — Combine a microwave with a range hood and light; door switches, magnetrons, turntable motors and the vent fan are the common calls.
- Built-in and trim-kit microwaves — Set into a wall cabinet, often above a wall oven; replacement means matching the trim kit and cutout.
- Microwave drawers — Open from the top; the drawer mechanism and its sensors add failure points.
- Combination wall ovens with a microwave — Two appliances in one hard-wired cabinet; see also wall oven repair.
- Countertop microwaves — Usually not worth a visit; we say so honestly. Exceptions are large commercial-grade units and some high-end convection models.
Symptoms we're called for
- Runs, light and turntable work, but food stays cold
- Heats weakly or takes much longer than it used to
- Loud hum or buzz, then stops heating
- Dead: no display, no light
- Turntable not turning
- Sparking or arcing inside
- Door won't latch, or the microwave stops when you touch the door
- Vent fan or light on an over-the-range model not working
Possible causes
These are possibilities, not a diagnosis; the technician confirms the cause on site.
- A door switch or interlock that has worn, so the control refuses to power the high-voltage circuit
- A failed magnetron, high-voltage diode or capacitor, which only a technician can test safely
- A blown line fuse or an open thermal cut-out after the door was opened mid-cycle or the unit overheated
- A demo or kitchen-timer mode that runs the display without heating, which Samsung lists as a first check
- A door that doesn't close fully because of debris on the frame or a bent latch
- A worn turntable motor or coupler, or a cracked roller ring
- A damaged waveguide cover or metal inside the cavity causing arcing
- On over-the-range units, a failed vent fan motor, light socket or damper
Repairs a technician may recommend
- Replace the door switches and interlock assembly and adjust the latch
- Replace the magnetron, high-voltage diode or capacitor, after discharging and testing the circuit
- Replace the line fuse and find the reason it blew
- Replace the turntable motor, coupler or roller ring
- Replace the waveguide cover and repair minor cavity damage where arcing has occurred
- Replace the control board, membrane keypad or door latch on built-in units
- Replace the vent fan motor, light socket or damper on over-the-range models
- Replace the drawer mechanism, motor or sensor on drawer microwaves
Typical components involved: door switches, latch and interlock, high-voltage transformer, capacitor and diode (technician-only), magnetron and waveguide cover, line fuse and thermal cut-outs, turntable motor and roller ring, control board and keypad, vent fan, filters and light (over-the-range), drawer drive and sensors (drawer models).
Safe checks before you book
- Check for a demo mode or a kitchen-timer setting; Samsung notes the timer counts down faster than normal in demo mode
- Make sure the door closes fully; wipe the door frame and latch area clean
- Unplug the microwave for a minute (or reset the breaker on a built-in) and try again
- Test the outlet with a lamp; over-the-range microwaves plug in inside the cabinet above
- Check the clearance and vents aren't blocked, as Samsung lists for weak heating
- Remove any metal, foil or a damaged waveguide cover from the cavity before running it again
Stop using it if
- Sparking or arcing inside the cavity, or a burnt spot on the waveguide cover
- A loud buzz or hum followed by no heating, which can indicate a high-voltage fault
- The microwave runs with the door open, or starts when the door closes without pressing start
- Smoke, a burning smell, or a melted spot on the door or cavity
- Never remove the outer cabinet: the capacitor can hold a dangerous charge after unplugging
Never work on gas lines, wiring, refrigerant or microwave components yourself.
What to expect during diagnosis and repair
On the phone we ask the type and model first. For a countertop unit we usually recommend replacement rather than a visit. For a built-in, drawer or over-the-range microwave, the technician checks the door switches, fuse and control, then unplugs the unit, removes the cabinet, discharges the high-voltage capacitor and tests the transformer, diode, capacitor and magnetron. You get a written finding with the total before any part is fitted. Door switches, fuses and turntable motors are often on the truck; magnetrons, control boards and drawer mechanisms are ordered by model. Over-the-range units may need to come off the wall bracket, and the finding says so.
Repair or replace?
For countertop microwaves the honest answer is usually replacement, and we give it on the phone. For over-the-range units a door switch, fuse, turntable motor or fan repair is worthwhile; a magnetron repair is a closer call and the finding shows the number against replacing the unit. Built-in and drawer microwaves lean toward repair because replacement means matching a trim kit or cabinet cutout, and combination wall ovens with a microwave section are almost always repaired rather than replaced for a microwave fault.
Our repair-versus-replacement method →
Pricing factors
The diagnostic visit is $89, waived when you go ahead with the repair, and the quote is given on the spot. What moves the repair price:
- Countertop units: usually a phone recommendation, not a visit
- Door switch or fuse versus magnetron or control board
- Over-the-range units that have to come off the wall bracket
- Built-in and drawer models with model-specific mechanisms
- Combination ovens where the microwave section shares a control
- Second appliance on the same visit: If a second appliance is diagnosed on the same visit, it is $45 instead of the full $89.
Brands we service for microwaves
Brand list subject to confirmation: most major brands, including LG, Samsung, Whirlpool, Bosch, GE, Maytag, Frigidaire, KitchenAid, Electrolux, Kenmore, Amana, Inglis, Miele, Jenn-Air, Fisher & Paykel, Haier and Danby. Independent service; no manufacturer affiliation implied.
Microwave questions
Is it worth repairing my countertop microwave?
Usually not, and we would rather say so on the phone than charge you a visit. If it is a large, high-end or commercial model, tell us the model and we'll give you a straight answer.
Can I test or replace the fuse myself?
No. The fuse is inside the cabinet next to a capacitor that can hold a high-voltage charge after the unit is unplugged. GE's own guidance is that microwave diagnosis needs special equipment. Leave the cabinet closed.
The microwave runs but doesn't heat. What's the usual cause?
A door switch, a failed high-voltage diode or capacitor, or a worn magnetron. On some models it is simply demo mode. The technician tests the high-voltage circuit safely and the finding names the part.
Do you repair over-the-range microwaves, including the vent fan and light?
Yes. Fan motors, lights, filters and dampers on over-the-range units are common repairs, along with the microwave itself.
My microwave sparks. Is it ruined?
Often not. Arcing is commonly caused by a burnt waveguide cover, exposed metal in a rack, or damage to the cavity paint, all of which are repairable. Stop using it until it is checked.
Do you install over-the-range microwaves?
Over-the-range units need a wall bracket, a cabinet-mounted outlet and, for vented models, a duct connection.
Related guides and pages
Service areas: Ottawa (central), Nepean, Kanata, Stittsville, Barrhaven, Orléans, Gloucester, Manotick and Riverside South, Gatineau (secteur Gatineau), Hull, Aylmer, Buckingham and Masson-Angers, Chelsea and Cantley.
Sources
Reviewed 2026-09-24.
Book a microwave diagnostic
Tell us the symptom and your postal code. You'll get a confirmed window, then a written finding before any repair.
Online booking is a request. We confirm the appointment by text or phone within 1 business hour.