Microwave runs without heating: stop at external checks

What you may notice

• The appliance appears to run but food remains cold.
• Timer activity may be mistaken for cooking.

Common causes

Step-by-step checklist

1. Confirm cooking, not timing

   Read the selected function and the model manual.

2. Inspect the external door

   With operation stopped, check for an obvious obstruction. A damaged latch, hinge, seal area or door needs service.

3. Request service if unresolved

   Keep the microwave cabinet closed; arrange qualified high-voltage service.

When to stop and get help

• Stop if the door is damaged, arcing occurs or burning is suspected.
• Stop using it if it continues operating with the door open. Do not repeat the condition as a test.
• Internal capacitors can retain dangerous charge after unplugging.

Prepare for a technician

• Record model, selected function, whether the door closes normally and when the symptom began.

Repair or replace?

• Compare a professional diagnosis/repair quote with installed replacement cost.
• Ask a qualified technician to establish the failed part before authorizing a replacement.

Compare itemized quotes or compare repair and replacement costs with your own figures.

Common questions

Sources and editorial status

Each reference supports the stated scope. Each source includes its scope and the date it was consulted.

1. Microwave - Runs But Does Not HeatGE Appliances · Accessed 2026-11-01

   The manufacturer explains stored-charge hazards and directs internal repairs to qualified service.

2. Microwave OvensU.S. Food and Drug Administration · Accessed 2026-11-01

   Supports stopping use for a damaged or insecure door and for operation with the door open. Use qualified microwave service to assess safety concerns.

Related research

• Microwave sparking: stop and inspect safely

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