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Microwave Repair in San Antonio

Microwave diagnosis and repair for homes, rentals and small businesses across San Antonio, for 27 brands.

Diagnosed on site before any priceYou approve the price before work startsWe tell you if a repair isn't worth it
(210) 401-3007

Call or use the form, and we'll offer you the earliest appointment we have.

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Two short steps: the appliance, then how to reach you. We'll contact you to arrange the visit.

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01Property
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What needs fixing
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TrueFix San Antonio

Microwave repair in San Antonio

TrueFix San Antonio repairs microwaves in homes, rentals and small businesses across San Antonio. Below you'll find the common microwave symptoms and what usually causes them, what to check before you book, and when a repair stops being worth it.

How a Repair Visit Works

01

Call or Book Online

Tell us the appliance, the brand, the model number if you have it, and what it's doing.

02

On-Site Diagnosis

A technician finds the fault on site before any price is discussed.

03

You Approve the Price

You get the price first. If the repair isn't worth it for your appliance, we tell you.

04

Repair & Test

We make the repair, test the appliance and show you what failed.

Common microwave problems and what causes them

A symptom tells you how the microwave is misbehaving, not which part failed. These are the usual causes behind each one; the diagnosis at your home confirms which applies.

Runs but Doesn't Heat

The light, fan and turntable work, but food stays cold. This points to the high-voltage circuit, which can hold a dangerous charge even after the microwave is unplugged, so it isn't a do-it-yourself repair.

Likely causes

  • Magnetron failed
  • High-voltage diode failed
  • High-voltage capacitor failed
  • Door switch not signaling closed
  • Inverter board failed on inverter models

How we narrow it down: The capacitor is safely discharged first, then the door switches, diode, capacitor and magnetron are tested. On inverter models the inverter board is tested. The failed part is replaced.

Sparking or Arcing InsideSafety

Sparks or flashes inside the cavity. Stop the microwave at once. Metal, foil or dishes with metallic trim cause sparks; if the cavity is empty of metal, something is wrong.

Likely causes

  • Waveguide cover burned or coated in food splatter
  • Metal rack or support used in the wrong position
  • Paint peeling inside the cavity
  • Food debris burned onto the cavity
  • Magnetron antenna damaged

How we narrow it down: The waveguide cover is inspected and replaced if burned. The cavity is checked for peeling paint and debris, and the magnetron tested if sparks continue. The damaged part is replaced.

Turntable Not Turning

The turntable stays still, turns in jerks, or grinds.

Likely causes

  • Turntable not seated on its coupler
  • Coupler cracked
  • Roller ring dirty or damaged
  • Turntable motor failed

How we narrow it down: The turntable, ring and coupler are checked. The motor is tested and replaced if it doesn't turn.

Door Won't Latch, or Door Damaged

The door won't latch, feels loose, or the door window is cracked. Stop using a microwave with a damaged door.

Likely causes

  • Door latch hooks broken
  • Door switch failed
  • Door hinge worn
  • Door window or frame cracked

How we narrow it down: The latch hooks, hinges and switches are checked. Damaged doors and latches are replaced, and the door switches tested together because they work as a safety set.

Won't Start

The display works but the microwave won't start, or stops when the door is touched.

Likely causes

  • Door switch failed
  • Door latch not pressing the switches
  • Control board fault
  • Thermal cut-out tripped

How we narrow it down: The door switches and latch are tested, then the thermal cut-outs and control board. The failed part is replaced.

Runs With the Door OpenSafety

The microwave runs, or the light and fan stay on, with the door open. Unplug it and don't use it until it's repaired.

Likely causes

  • Door switch welded closed
  • Monitor switch failed
  • Control relay stuck

How we narrow it down: The door switches, monitor switch and control relay are tested, and the whole interlock set replaced as needed.

Display Blank or Keypad Not Responding

The display is blank or dim, or the keypad doesn't respond.

Likely causes

  • Control lock activated
  • Keypad membrane failed
  • Control board failed
  • Fuse blown

How we narrow it down: A control lock is ruled out, then the keypad and control are tested. If a fuse blew, the reason is found before the fuse is replaced.

Loud Humming, Buzzing or Grinding

Louder humming, buzzing or grinding than usual during cooking.

Likely causes

  • Magnetron failing
  • Turntable motor worn
  • Cooling fan worn
  • Diode or transformer buzzing

How we narrow it down: The noise is traced to the magnetron, fan or turntable motor, and the failing part replaced.

Burning Smell or SmokeSafety

A burning or electrical smell, or smoke without food burning. Stop the microwave and unplug it.

Likely causes

  • Waveguide cover burned
  • Wiring or component overheating
  • Grease in the vent area
  • Magnetron failing

How we narrow it down: The cavity, waveguide cover and internal components are inspected with the unit discharged. The damaged part is replaced.

Vent Fan Not Working or Noisy

On an over-the-range microwave, the vent fan doesn't run, runs weakly or makes noise.

Likely causes

  • Grease filters clogged
  • Vent damper stuck
  • Fan motor worn
  • Control output failed

How we narrow it down: The grease filters are cleaned and the damper checked. The fan motor is tested and replaced if needed.

Light or Cooktop Lamp Out

The cavity light or the cooktop light on an over-the-range model doesn't work.

Likely causes

  • Bulb or LED failed
  • Socket failed
  • Control output failed

How we narrow it down: The bulb or LED is replaced and the socket and control checked.

Shuts Off After a Few Seconds

The microwave starts, then stops after a few seconds.

Likely causes

  • Thermal cut-out tripping
  • Cooling fan not running
  • Door switch intermittent
  • Magnetron overheating

How we narrow it down: The cooling fan and thermal cut-outs are tested, and the door switches checked. The failed part is replaced.

Trips the Breaker or Blows a Fuse

The microwave trips its breaker, or blows its internal fuse repeatedly.

Likely causes

  • Door switch failed, shorting the circuit
  • High-voltage component shorted
  • Magnetron shorted
  • Wiring damaged

How we narrow it down: The door switches and high-voltage components are tested with the unit discharged. The shorted part is replaced before a new fuse is fitted.

Paint Peeling or Rust Inside

Paint is chipping inside the cavity, or rust spots are forming. Exposed metal can cause arcing.

Likely causes

  • Moisture and food splatter wearing the coating
  • Scratches from utensils
  • Age

How we narrow it down: The damage is assessed. Small areas can sometimes be repaired with microwave-cavity paint; larger damage can mean the unit isn't worth repairing.

Fan Runs After Cooking Stops

The fan keeps running after the timer ends. Many over-the-range models run the vent fan automatically when the cooktop below gets hot, which is normal.

Likely causes

  • Automatic heat-sensing vent mode
  • Thermostat in the vent stuck
  • Control relay stuck

How we narrow it down: The model's automatic vent behavior is confirmed first. If the fan still won't stop, the thermostat and relay are tested and replaced.

Microwave brands we repair

Samsung logoLG logoWhirlpool logoGE Appliances logoMaytag logoBosch logoKitchenAid logoFrigidaire logoViking logoKenmore logoAmana logoElectrolux logoMiele logoThermador logoAdmiral logoAvanti logoBlomberg logoDacor logoFisher & Paykel logoGaggenau logoHotpoint logoInsignia logoJennAir logoRoper logoSharp logoSmeg logoThor Kitchen logo
Microwave · San Antonio

How we approach microwave repairs

On a microwave we check the door interlock switches before anything else — they fail more than any other microwave part and they're also the safety cutoff, so nothing further gets tested until they check out.

One microwave symptom that's easy to misread is a microwave that lights up, turns and hums but leaves food cold, which feels like a total loss but usually means a failed magnetron, high-voltage diode or capacitor, not the control board.

Microwaves in San Antonio homes

In San Antonio's older kitchens, microwaves are often built into a cabinet or wall with a trim kit, or sit on a counter because there's no room for an over-the-range model. Built-in units have to come out of their trim for most repairs.

Over-the-range microwaves in San Antonio's updated ranch kitchens often double as the range hood. Grease filters, the vent fan and the cooktop light are part of the job, and a vent fan that runs on its own is usually a heat-sensing feature working as designed.

Nearly every builder kitchen in San Antonio has an over-the-range microwave above the range, often matching the rest of the package. Door switches, the vent fan and the magnetron are the usual failures, and mounting it back on its wall plate is part of any repair.

Apartment microwaves in San Antonio are mostly over-the-range units owned by the property or countertop models the tenant owns. A basic countertop model often costs less to replace than to repair.

Locally, the thing that matters most for a microwave is over-the-range microwaves in builder kitchens that double as the range vent, where the grease filters and exhaust fan become part of the job.

Repair or replace?

Most microwave repairs involve parts that wear out and are inexpensive to replace: door switches, fuses, turntable motors, and on over-the-range models the vent fan, light and filters. Those are usually worth fixing, even on an older unit.

The decision gets harder when the fault is the magnetron or the control board. On a newer or built-in microwave it can still be the right call; on one well into its working life, replacing it often makes more sense. You'll have the price and our view before anything is done.

Microwave safety

A microwave's high-voltage capacitor can hold a dangerous charge after the plug is pulled, which is why internal repairs aren't a do-it-yourself job. If a microwave sparks, smells of burning, or runs with the door open, unplug it and leave it unplugged.

FAQ

Microwave Repair Questions

Short answers to the questions that come up before a repair. If yours isn't here, ask when you book.

Ready to book?

Tell us the appliance, the brand and what it's doing, and we'll offer you the earliest appointment we have.

Call usBook a repair

After the diagnosis, not before. Most microwave repairs involve parts such as door switches, fuses, turntable motors, and on over-the-range models the vent fan, light and filters, which are modest jobs. The bill is higher when the fault is the magnetron or the control board. You get the price once we've found the fault, and nothing is done until you approve it.

Check the breaker and make sure the door latches firmly. If it runs but doesn't heat, stop using it: the fault is in the high-voltage section, which isn't a do-it-yourself repair.

On most microwaves it's inside the door frame, or on the back or side of the cabinet. A photo of the label is ideal: it tells us exactly which model you have and which parts to bring.

Usually, when the fault is a part that wears out. It's a closer call when the fault is the magnetron or the control board on a unit that's well into its working life. You'll get the price and our view on it, and the decision is yours.

Call usBook a repair