It’s a small habit, but pressing the Cancel (or Stop) button before you open the microwave door can help your microwave last longer. At Jeffrey’s Appliance Service, we repair microwaves regularly, and one common issue involves worn or carbon-fouled door switch contacts. This simple step can reduce that wear.
What Happens When You Open the Door While It’s Running
When a microwave is operating and you pull the door open, the door switches immediately interrupt power to the magnetron and turntable. That sudden interruption can create a small electrical arc across the switch contacts. Over thousands of cycles, this arcing leaves carbon buildup on the contacts.
Carbon buildup can cause:
Intermittent operation (microwave starts and stops randomly)
The microwave not starting at all
Door switch failure
In some cases, more expensive control or safety circuit problems
The Better Habit
Press the Cancel or Stop button first, then open the door.
This stops the magnetron and turntable through the control board before the door switches have to interrupt full power. The switches still do their safety job, but they experience far less arcing and carbon buildup over time.
Other Microwave Care Tips
Keep the interior clean — food splatters can cause arcing and odors.
Don’t run the microwave empty.
Avoid metal or foil unless the manufacturer specifically allows it.
If the microwave makes unusual noises, sparks, or won’t start, stop using it and have it checked.
When to Call for Microwave Repair
If your microwave won’t start, stops mid-cycle, or the turntable isn’t moving, the door switches are a frequent culprit — especially on units that have been opened while running for years. Many microwave repairs are straightforward when caught early.
Microwave Service in Spokane Valley
Jeffrey’s Appliance Service has been repairing microwaves and other appliances across the Spokane and surrounding areas since 1985. Our factory-trained technicians can diagnose door switch issues and other common microwave problems.