If the fuse is blowing immediately when the microwave is activated, I'd suggest someone check operation of the door switches. by Charlie (Pennsylvania) I do some appliance repair, but never really tried to fix a microwave. A - Usually a shorted high voltage capacitor...see components section. The least expensive repair to make on a microwave is to replace a blown fuse, but it may take time for the repair tech to diagnose the problem—time that could add up to more than the cost of a new unit. Q - My microwave went dead when I opened the door ( same problem as closed the door ). My fuse blowing was a result of one of the two interlock switches failing. Blown fuses To determine if your fuse has blown out, which may attribute to your microwave not running, you need to pull the fuse out using a pair of fuse pullers. As always, abide by the proper safety measures when working with electricity. If you overload a circuit, your system will cut off the electrical flow to prevent circuit damage or a fire. I assume your replacement fuse is the proper type and specific rating. Left it on as usual, but everything inside it was still cold. Follow these steps to restore power and get those appliances going again. I spent 6 years in the Navy as an Aviation Electronics Technician and also taught electronics at a trade school for several years after getting out so I now my way around a switch and how to test them. Here are prices for parts (excluding labor) that commonly need to be replaced in malfunctioning microwave ovens: Magnetron: $100–$150 Follow these easy steps to fix a blown fuse: 1. Hi, Yesterday when turning on my microwave I heard a strange humming noise; louder than the usual noise the microwave makes. If your microwave has a dedicated circuit and the breaker keeps tripping, test the microwave on a higher amp circuit. Dan O. Q - My microwave blows the fuse inside itself as soon as I push the start button. If the microwave trips that breaker, then you know the microwave is at fault. You could try a ceramic delay burn fuse it is not your standard fast blow fuse. Sounds like the fuse your using is sensitive to the voltage surge when interrupting the cooking cycle by opening the door. Blowing a fuse or tripping a circuit breaker is a relatively common issue, especially if you like to vacuum, listen to music and microwave popcorn at the same time. so unless you have dead units that can be cannibalised -just by a basic model for around $50. It lasted for about 3 seconds and then stopped. Emerson microwave blows fuses. All 3 door switched must operate in sync or the fuse will blow if started, as a safety precaution. photo a blown mains transformer there are some very heavy induction loads in this type of circuitry so other than switch failure most of these faults are beyond economic repair a Magnetron $20+ a Transformer $40 even a thermal fuse $10. Luckily, fixing a blown fuse is a relatively easy DIY home repair. Lay it down and using a volt-ohm meter on RX1, check both ends of the fuse in question. A - This often is a stuck or faulty door switch and it has blown the interior microwave fuse. All you need is some basic knowledge about your fuse box and a quick trip to the hardware store and you’ll be back in business. Someone gave me an Emerson MW8118SL that is about 1 1/2 years old and I figured I'd give it a shot. It could be a simple issue with the microwave having a blown fuse or it may be time to get a new microwave oven. The main fuse was blown. Issue was the fuse kept blowing every time the door was opened while the microwave was operating.

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