Microwave Repair in Nairobi — Common Faults, All Brands & Repair Guide

1. Microwave Types We Repair in Nairobi

We service all types of microwave ovens used in homes, offices, restaurants, and hospitals across Nairobi.

2. Common Microwave Faults We Fix in Nairobi

Here are the faults we repair most often across Nairobi, along with what causes them and how each is resolved.

a) Microwave Not Heating

This is the most common microwave complaint in Nairobi. The microwave runs — you can hear the turntable spinning and the light comes on — but food comes out cold. This is almost always an internal component failure, not a wiring issue.

b) Microwave Sparking Inside

Sparking inside the microwave cavity is alarming — and means you should stop using the unit immediately. It is a fire and safety risk.

c) Turntable Not Spinning

The food doesn't rotate during cooking, leading to uneven heating. This is usually a mechanical fault and one of the simpler repairs.

• Turntable motor burnt — the small motor beneath the plate has failed; we replace it on the spot
• Broken turntable coupling / drive bushing — the plastic coupling that connects motor to tray has cracked; inexpensive replacement
• Broken turntable ring or support roller — the roller guide under the glass plate is cracked or jammed; replace the ring assembly
• Misaligned or cracked glass turntable plate — replace glass plate with correct size for your model

d) Door Not Closing or Latch Broken

A microwave will not run — and should not run — if the door does not close and latch correctly. The door safety switches prevent operation with an open door.

• Broken door latch hook — the plastic hooks that catch into the latch have snapped; replace door latch assembly
• Faulty door interlock switch — one or more of the 2–3 safety switches behind the latch have failed; replace switches
• Damaged door hinge — door doesn't align properly; hinge replacement or door realignment
• Cracked door — if the door inner glass or seal is damaged, the unit must not be used until repaired

e) Display Not Working / Buttons Not Responding

• Blown main fuse — usually caused by a power surge; replace the fuse (common after Kenya power fluctuations)
• Faulty control board — the main circuit board has failed; check for burnt components, replace if necessary
• Membrane keypad worn out — buttons become unresponsive after years of use; replace the keypad panel
• Loose ribbon cable — the cable connecting keypad to control board has come loose; reseat or replace

f) Microwave Making Loud Noise

• Loud humming — magnetron or high-voltage transformer failing; needs inspection
• Rattling — loose turntable ring or broken roller; replace roller assembly
• Grinding — turntable motor failing; replace motor
• Buzzing during operation — normal at low levels; excessive buzzing indicates a diode or magnetron issue

g) Microwave Trips the Power / Blows Fuse at Home

If your microwave causes the circuit breaker to trip every time it's used, this indicates a serious internal short circuit.

• Shorted high-voltage capacitor — most common cause; capacitor has internally shorted to earth
• Shorted magnetron — magnetron filament or antenna has shorted; replace magnetron
• Damaged power cord — insulation breakdown in the power cable; replace cord

h) Smoke or Burning Smell

• Burnt food residue inside cavity — deep clean required; grease buildup can ignite
• Burnt waveguide cover — the mica sheet absorbs grease and begins to burn; replace it
• Failing component on control board — visible burnt marks on PCB; component-level repair or board replacement
• Burning magnetron — magnetron filament burning out; replacement needed

3. How a Microwave Oven Works

Understanding the basic mechanics helps explain why certain faults occur and why some repairs require specialist handling.

A microwave converts electrical energy into microwave radiation using a component called the magnetron. The magnetron requires very high voltage — typically 2,000–4,000 volts — generated by a high-voltage transformer, capacitor, and diode circuit. This high voltage is what makes microwaves dangerous to open without training.

Microwaves enter the food cavity through the waveguide and cause water molecules in the food to vibrate rapidly, generating heat. The turntable rotates food so it heats evenly. The door interlock switches (usually 2–3 switches) cut power to the magnetron the instant the door opens.

4. Microwave Brands We Repair in Nairobi

We repair all microwave brands available in Kenya. Here's a quick breakdown of the most common brands and their known weak points.

5. How We Diagnose Your Microwave

Our technicians follow a structured process to find the fault accurately and safely.

1. Visual InspectionCheck for obvious damage — burnt marks, cracked door, damaged cavity, burnt waveguide cover.
2. Power CheckConfirm 240V supply, check internal fuse, test door interlock switches.
3. Safety DischargeDischarge the high-voltage capacitor safely before touching any internal components. Non-negotiable step.
4. Component TestingTest magnetron, diode, capacitor, and transformer using a multimeter and specialist tools.
5. Control Board InspectionCheck PCB for burnt traces, failed relays, or damaged components.
6. Turntable & Mechanical CheckTest turntable motor, coupling, and roller assembly for wear or breakage.
7. Function TestRun a controlled heat test after repair to confirm the fault is fully resolved before leaving.

6. Is It Worth Repairing My Microwave?

A question we get often — and the honest answer is: it depends on the fault.

We give you an honest assessment before starting any work. If the repair cost approaches the price of a new unit, we will tell you — we don't charge for diagnosis if we advise replacement.

7. Tips to Extend Your Microwave's Life

• Clean the cavity after every use. Grease and food splatter absorb microwave energy, burn onto the cavity walls, and eventually damage the waveguide cover and magnetron.
• Replace the waveguide cover if it looks discoloured or burnt. It costs very little and prevents expensive magnetron damage.
• Never run the microwave empty. With no food to absorb the microwaves, energy reflects back and destroys the magnetron within seconds.
• Always ensure adequate ventilation. Leave at least 15cm clearance on all sides and above. Blocked vents cause thermal cutouts to blow repeatedly.
• Use a surge protector. Kenya's power fluctuations frequently blow the internal fuse and damage control boards.
• Never use metal containers or aluminium foil unless your unit specifically supports it. Metal causes sparking and damages the cavity.
• Avoid slamming the door. The door latch hooks are plastic — repeated slamming cracks them over time.

8. Microwave Safety Warnings

9. Frequently Asked Questions