Quick answer
A microwave that runs but does not heat usually has a failed high-voltage part such as the magnetron, diode or capacitor. A microwave that will not start usually has a door switch or control problem. Appliance Repair Philly repairs countertop, over-the-range and built-in microwaves. The diagnostic is $60 flat and credited toward the repair. Many repairs cost $120 to $250, and some units are cheaper to replace.
Common microwave problems
| What you see | Likely cause | Typical fix |
|---|---|---|
| Runs, lights up, food stays cold | Magnetron, diode, capacitor, transformer | Replace the part, or replace the unit |
| Will not start | Door switch, door latch, fuse, control board | Replace switch, latch or fuse |
| Sparks or arcs inside | Damaged waveguide cover, food debris, chipped paint | Replace the cover, clean |
| Turntable does not spin | Motor, coupler, roller ring | Replace the coupler or motor |
| Buzzing or loud hum | Fan motor, transformer, magnetron | Test and replace |
| Display dead or keys not working | Control board, touch panel | Replace board or panel |
| Door will not close or open | Latch hooks, door spring | Replace latch parts |
Your microwave is high voltage even when unplugged. A capacitor can hold a dangerous charge for days. Never open the case yourself.
Over-the-range and built-in units
An over-the-range microwave also has a vent fan and a light. A failed fan, a bad light socket or a worn grease filter is cheap to fix. Mounting plates are in the cabinet, so removing one takes two people. Built-in trim kit models need exact parts. Tell us the model number, usually on a label inside the door frame.
What you can check first
- Plug it directly into a wall outlet, and reset the breaker or GFCI.
- Check the door for food on the latch hooks.
- Look for a child lock or demo mode on the display.
- Never run the unit empty. It can damage the magnetron.
- If you see sparks, stop and unplug it.
Repair or replace
Microwaves last about 9 years. Under 5 years old, or a built-in or over-the-range model, repair is often worth it. A high-voltage failure on a basic $120 countertop is usually not. We tell you honestly at the visit, and if replacing is better, you pay only the $60 diagnostic. Our cost guide explains the rule.
What microwave repair costs
| Job | Typical total with part |
|---|---|
| Diagnostic | $60 flat, credited to the repair |
| Door switch, latch, turntable motor | $120 to $200 |
| Fan, light or filter on over-the-range | $120 to $220 |
| Magnetron, diode or capacitor | $180 to $300 |
| Control board | $200 to $350 |
How it works
- Send the brand, model and what the microwave does.
- Call to check the next open appointment; availability depends on the schedule.
- Diagnosis and a clear price. The $60 is credited if you go ahead.
- Repair and test. Ask what the repair includes when you book.
Areas we serve
Philadelphia, Northeast Philadelphia, Bensalem, Willow Grove, Abington, Huntingdon Valley, Southampton and Feasterville-Trevose.
See also oven repair and stove, range and cooktop repair.
FAQ
Why is my microwave running but not heating?
Usually the magnetron, diode or capacitor. These are high-voltage parts and should be tested only by a technician.
Is it worth repairing a microwave?
For over-the-range, built-in or newer units, often yes. For a cheap countertop with a high-voltage fault, usually not.
How much does microwave repair cost?
Most repairs are $120 to $300. The $60 diagnostic is credited toward the repair.
Why is my microwave sparking?
Often a damaged waveguide cover or food stuck inside. Stop using it until it is checked.
Is it safe to open a microwave?
No. The capacitor can hold a charge even when it is unplugged.
My microwave runs but the food stays cold. Is that fixable?
Sometimes. See microwave not heating for the usual causes, such as a bad diode, magnetron or door switch.