Kitchenaid Microwave Combi Oven: burning smell

Professional Repair Guide

What is this symptom?

Are you experiencing a burning smell from your KitchenAid Microwave Combi Oven? This odor can occur during or after operation and may linger even with a clean cavity. Common causes include food residue, a damaged waveguide cover, or faulty electrical components. It's essential to address this issue promptly to prevent further damage.

Urgency: High

Important Tips for Kitchenaid Models

KitchenAid guides specifically list waveguide cover damage, power supply board faults, and thermostat issues as common part-related causes for burning smell.

Possible Causes

Food residue or burnt food inside cavity

How to Identify: Burnt smell only during or after heating food; visible burnt splatters or residue inside cavity

Part: Microwave interior surfaces (walls, ceiling, turntable)

Damaged or burning waveguide cover

How to Identify: Sharp burning smell with possible arcing or sparks inside cavity; discoloration or damage on waveguide cover

Part: Waveguide cover (mica/plastic sheet)

Faulty power supply board or electrical components

How to Identify: Persistent burning smell even after cleaning, possible burning odor not tied to food; signs of burned components on board

Part: Power supply board / control board

Failing high voltage capacitor or magnetron

How to Identify: Persistent electrical burning smell, microwave not heating properly or uneven heating; visible damage to high-voltage components

Part: High voltage capacitor / magnetron

Overheated wiring insulation or blocked airflow

How to Identify: Burning smell accompanied by overheating casing, lack of cooling, or unusual noises

Part: Internal wiring / cooling components

DIY Solutions

Clean interior to remove burnt residue

Easy 15â€“30 minutes

Tools Needed: mild detergent, soft cloth or sponge, vinegar or lemon (optional)

Unplug the microwave.
Remove turntable and wash with warm soapy water.
Wipe all interior surfaces to remove food splatters and burnt debris.
Optionally microwave a bowl of water with vinegar or lemon for 2â€“5 minutes to loosen residue, then wipe again.

⚠️ Safety First: Unplug before cleaning

Inspect and replace waveguide cover

Moderate 30â€“60 minutes

Tools Needed: screwdrivers, replacement waveguide cover

Unplug and remove microwave outer cover.
Locate and inspect waveguide cover for damage.
Remove damaged cover and install new waveguide cover.
Reassemble microwave and test.

⚠️ Safety First: High voltage capacitor can retain charge â€” discharge before touching internal components

Professional Repairs

Replace power supply board

Estimated Cost: $100â€“$300

Replace high voltage components (magnetron/capacitor)

Estimated Cost: $150â€“$400

When to Call a Professional

Burning smell persists after thorough cleaning

Visible electrical arcing, sparks, smoke, or melting inside cavity

Microwave not heating properly or unevenly and smell present

Uncertain about safely accessing internal high voltage parts

Preventive Maintenance

Clean interior after each use: Food residue buildup that causes burnt odors
Frequency: weekly
Check and clean ventilation openings: Overheating and blocked airflow issues
Frequency: monthly

Frequently Asked Questions

Why is my KitchenAid Microwave Combi Oven burning smell?

Common causes include food residue, a damaged waveguide cover, or faulty electrical components.

How do I fix KitchenAid Microwave Combi Oven burning smell myself?

Unplug the microwave, clean the interior, and inspect the waveguide cover for damage.

How much does it cost to fix burning smell?

Professional repairs can range from $100 to $400, depending on the issue.

When should I call a technician for burning smell?

Call a technician if cleaning doesn't resolve the smell or if electrical components may need replacement.

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Can I Fix This Myself?

70%

DIY Success Rate Difficulty: Either

Common Issues Reported by Users

Food debris or spills inside the microwave cavity causing burning odors.
Faulty or worn-out magnetron overheating, leading to a burning smell.
Burnt wiring or insulation within the microwave, potentially due to age or damage.

User Suggested Solutions

Clean the interior of the microwave thoroughly, removing any food debris or spills. Use a damp cloth and a mild detergent to wipe down all surfaces, including the turntable and the area around the magnetron.
Inspect the microwave for any signs of burnt wiring or insulation. If visible damage is found, disconnect the microwave and replace the damaged parts with appropriate replacements.
If the magnetron is suspected to be faulty, test it with a multimeter for continuity. If it fails the test, replace the magnetron. This may require professional assistance if you are not experienced.