If your microwave stops heating, makes weird noises, or won’t turn on, you don’t always need to call a technician right away. Most issues are simple enough to handle with a screwdriver, a multimeter, and a bit of patience. Below you’ll find the most common problems, quick fixes you can try, and clear signs that it’s time to hand the job to an expert.
Microwave won’t heat. The first thing to check is the door latch. If the latch isn’t engaging, the safety interlock stops the magnetron from powering up. Look for broken or misaligned latch tabs and snap them back into place. If the latch looks fine, the next suspect is the fuse. Unplug the unit, locate the fuse (usually a small glass tube near the power cord), and test it with a multimeter. A blown fuse is cheap and easy to replace.
Spinning plate stops. A noisy or stuck turntable often means the roller guide or motor gear is worn out. Remove the glass plate, pull out the rubber roller, and clean any food debris. If the roller is cracked, replace it – they cost less than £10. Also, spin the motor shaft by hand; if it feels gritty, the motor may need lubrication or replacement.
Weird smells or sparks. Burning smells usually point to food splatter on the magnetron or waveguide cover. Take out the interior panel (after unplugging), wipe the waveguide with a damp cloth, and make sure no metal pieces are stuck inside. If you see visible damage to the magnetron, that part typically requires a professional because it handles high voltage.
Microwave beeps constantly. This can be a control board glitch. Try resetting the unit: unplug it, wait two minutes, and plug it back in. If the problem persists, check the keypad contacts for moisture or wear. Cleaning with a cotton swab dipped in isopropyl alcohol can restore proper function.
Safety is the top reason to call a pro. If you discover any damaged high‑voltage capacitor, cracked waveguide, or signs of arcing inside the cavity, stop working on it immediately. These components store dangerous charge even when unplugged and can cause serious injury.
Another red flag is recurring issues after you’ve replaced the suspected part. For example, if you swapped a fuse and the microwave still won’t heat, the problem may lie deeper in the control board or magnetron, which requires specialized testing tools.
Finally, consider the age of the appliance. Microwaves typically last 7‑10 years. If yours is older and parts are becoming scarce, the cost of repair might approach the price of a new unit. In that case, budgeting for a replacement could save you time and money.
In most cases, a quick visual inspection, a few basic tools, and a safe approach will get your microwave back in action. Keep a simple repair kit handy, follow the steps above, and you’ll avoid unnecessary service calls. When you’re unsure, don’t gamble with high‑voltage parts – a qualified technician will have the right equipment and experience to get the job done safely.
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