If your microwave oven suddenly stops working, the problem may be the fuse. If you have some experience working with electrical equipment, you can check it and replace it.

Precautions

Don’t attempt the job if you aren’t comfortable with it. If you don’t know a capacitor from a caster, leave the matter to a professional. Even an unplugged microwave oven may contain high voltages and could give you a dangerous shock. If you’re learning, be sure you have expert supervision, and follow all instructions.

Leave the oven unplugged for at least fifteen minutes before opening it up. The main capacitor holds a very high voltage, and it needs time to discharge. Even after that, don’t assume that it’s safe to touch.

Checking the fuse

Start with what’s obvious and easy to check. Unplug the appliance and check if the outlet is delivering power. Plug in a lamp at the same outlet and see if it gets power. If not, the problem is more likely a circuit breaker than the oven. If it keeps throwing the breaker, though, you should check why. You might be running too many appliances on the same circuit, or the oven could be defective.

Unfortunately, microwave fuses are rarely in a convenient location. You’ll have to do some disassembly to get to the fuse. Typically this means removing a panel. Set all the screws aside. The power cord will lead to the fuse holder. Be careful not to touch any electrical parts or interior metal objects.

The fuse will be one to two inches long. It may be a glass fuse with a filament, or a ceramic fuse. It’s easy to tell if a glass fuse is blown; it will show scorch marks, and the filament will be melted. To check a ceramic fuse, use an ohmmeter or continuity tester. With an ohmmeter or multimeter, you should see a reading close to zero ohms if the fuse is intact, or infinite if it’s blown. If a continuity tester indicates continuity when you touch its lead to the ends of the fuse, it’s good.

If the fuse is good, the problem lies somewhere else. The outlet may have an unreliable connection, or another component may have failed. Reassemble the oven and try it at a different outlet. If it still does nothing, it needs service.

If the fuse is open, then the next step is determining what caused the fuse to blow. If you just simply replace the fuse, there is a good chance the fuse will blow again.

Replacing the fuse

If you have a blown fuse, take a look at the other circuitry without touching it. If you see any loose objects, they might be the source of a short circuit. Remove them using a non-conducting tool. If you see damaged electrical components, replacing the fuse won’t do any good and could create a hazard.

Remove the fuse from its clip and replace it with a new one of the same type. The new fuse must have the same ampere rating as the original; one with too low a rating will blow immediately, and one with a higher rating won’t stop dangerous current. Make sure the clip holds the fuse snugly. Reassemble the oven and plug it in. If the control display comes on, you’ve replaced the fuse successfully.

Put a microwave-safe cup of water in, and run the oven for fifteen seconds. If it stops working again, something is wrong with it. Time to call for service. We recommend replacing the monitor switch, it is the most likely cause for why the fuse failed in the first place. if you are not sure which one it is, we can help! If you don’t want to waste money on fuses, check out our re-settable fuse for microwave repair!

Simple repairs such as this aren’t a problem if you have basic electrical skills. For more difficult ones, get in touch with Fred’s Appliance. We’ll be happy to get your appliances working again.

A common microwave problem
One of the most common microwave failures is the touchpad. Over time, the touchpad becomes less sensitive, and you may start to see certain numbers or buttons fail intermittently. It’s also possible to damage the touchpad while cleaning. Never use glass cleaners or harsh chemicals on touchpad surfaces, as they can cause a short.

The material cost of replacing a touchpad ranges from $10 to $20, while a touchpad plus full control panel will cost $50. A microwave repair professional should be able to complete this job within an hour and on the low end of the cost scale, along with checking to make sure other microwave systems aren’t at risk.

An uncommon microwave issue
One of the rarest problems is a microwave that runs when the door is open. In most cases, this is the result of a broken fan still spinning. It’s also possible, but unlikely, for all three “interlock” switches — the ones that engage when the door’s closed — to fail simultaneously.

A microwave that works when the door is open poses a serious risk. If this occurs, your best bet is a new microwave, as any fix will be very expensive.

Repair or replace?
Microwaves are easy to replace and don’t add significant value when a home is sold. If you have an expensive model or one with special features, have it repaired.

Depending on the purchase price of your microwave and the cost of repairs, you may decide to replace it. If you have a basic model, which can cost as little as $60, consider a replacement.

Replacement also may be the best bet with high-end models, which can run $500 to $1,000. If your broken microwave cost $250 but repairs are $150, you may save more in the long term by getting a new one.

Considering contractors
If you choose to fix your microwave, make sure to find the right contractor. Start by getting recommendations and looking online in your area. Once you find a prospective contractor, head to a trusted review site like Angie’s List and look at what other consumers in your area are saying.

The right small appliance repair company will be upfront about its pricing, respond quickly to any inquiries and give you sound advice on the repair/replace dilemma.

There are several ways to help lower costs for appliance repair. First, know the difference between what should be repaired and what should be replaced. The average lifespan for most large appliances is between eight and ten years; while many last longer, the price of repairing an old appliance combined with its high likelihood to break again may make replacement a better option.

In addition, you can save money by being as detailed about your problem as possible before the appliance technician arrives. This means providing symptoms of the issue along with the make, model and serial number of the appliance in question. Often, an experienced contractor will be able to make an interim diagnosis, and bring the appropriate parts on the first visit. This saves you excess labor cost and time spent identifying the issue. In addition, make sure to get quotes from more than one company. Some professionals won’t want to provide an estimate over the phone: Avoid these companies, as they are likely trying to get you to commit to a service charge with no real idea of total cost.

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Keeping costs down for appliance repair means doing your homework on companies, providing detailed information about your problem and sidestepping providers who don’t offer solid estimates

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