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wpcoe

Microwave Ovens -- Do They Wear Out Slowly?

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I have a 5-year old Daewoo 800-watt microwave oven. It seems to take longer to cook/heat things than it did when it was new.

IIRC I used to heat two cups of water for my coffee in about 5 minutes, but now I need to take 7 or more minutes. (I use filtered tap water, and just for peace of mind, I like the water to boil for at least 60 seconds).

I don't often cook in the microwave, but I thought I used to be able to cook a couple chicken legs and/or thighs in about 8 or 9 minutes. The other night I put in two chicken legs and after 11 minutes, it was still not well done.

Do microwave ovens gradually start wearing out as I seem to be experiencing, or is there something else wrong, like my memory? :D

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do you use every time the same cup?

the thiknes of the cup could influence the heating time

look inside the wave

see any black color ?

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It's possible your incoming power isn't what it used to be. Or....if you're on village power and trying to run an ac, you're microwave will definitely take longer.

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Suggest you check the power setting of the oven. In some models, power level can be set to 50%, 70% and 100%.

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I think microwaves ovens do deteriorate over time. I suspect (although I have absolutely no proof) that they wear out because they gradually cook themselves to death. This could occur if the oven was supplying more energy than the food/drink could quickly absorb. That excess energy could conceivably cook the oven's operating components. (?)

OK, slightly O/T, but while you're waiting for the proverbial water to boil, consider how you could use your microwave oven and a block of cheese to calculate the speed of light. It can be done, and with pretty good accuracy :)

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I think I'd go with the iffy power supply post, worth checking your supply voltage with and without the oven operating.

All the ones I've had fail have gone off with a nice solid bang :(

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I think I'd go with the iffy power supply post, worth checking your supply voltage with and without the oven operating.

All the ones I've had fail have gone off with a nice solid bang :(

I go along with Crossy 100% and know from personal experience how much reduced/reducing power supply affects Microwaves, electric ovens grills, toasters and electric kettle cooking/boiling times.

As Corssy knows (having offered me much kind and helpful info over a period on my power supply issues)I lived through 1 year of iffy reducing power voltages before the PEA finally added an extra power line after 10 months of nicely asking and chasing.

Please Note I live in the Muang district of Khon Kaen City (so it is far from only villages that find power supplies iffy, as the Electricity company keeps hooking up new homes on over worked lines PLUS people's increasing electrical needs(such as Air cons which can really drain voltage on overstretched supply lines)

Regards

Dave

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Power output is quite sensitive to the AC input - there is no regulation. A 10% drop in line voltage is likely to reduce microwave power output by more than 20%

Magnetrons, the device that creates the microwaves, like other vacuum tubes, can weaken with age and use. An oven that sees daily use may indeed weaken over the course of several years.

My microwave suffered a drop in power over a period of time until one day it wouldn't heat a thing but before chucking it out I decided to see if it was something other than a dead magnetron. What I found was a dry joint that had developed over some time on the relay contact that controlled power to the magnetron. Resoldering fixed it, but you would need someone who knows microwave oven servicing to check it. If you are of a non-technical nature I wouldn't suggest to anyone to open a microwave unless they're 100% confident of what they are doing as there is around 5 to 7 Kv around the magnetron and there is a capacitor inside charged to lethal voltages.

If in any doubt get a new microwave.

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My microwave oven is about 15 years old. It definitely has gradually lost "power" over the years (still works though).

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I don't know for sure, but guessing the 1/2 life of a magnatron is about 100 times that of a single guy in LOS. :ermm:

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Oh, my. Such a variety of responses! :D

I use the same cup every time, I don't want yet another device (kettle) cluttering my small kitchen counter, the power setting (by default) is set to 100%, and haven't a clue how to measure the supply voltage.

Guess I'll just set the old range for 20 minutes per piece of chicken and 40 minutes to boil my coffee water. (just kidding!)

One variable that I did consider was the temp of the water before submitting it for boiling, and even when it's "warm from the tap" (due to the outdoor tank heating up with the daytime sun), it seems to take too long.

Thanks for all the input!

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Mine totally quit heating one day...found online that a diode can go out. It's near where power cord comes inside and one end grounds to the frame. Amorn shop had the diode replacement 60 baht.... Was an easy fix

careful though like previous posts warned. Deadly voltages to stay away from..

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No idea about your model.

Years ago in the UK my Microwave 'Brothers' Combi appeared the same, took the cover off and there was 2 heating elements, 1x white the other was black, took it out and went to buy another...... In UK that is a NO NO, sure the shop had one but they would not sell.. can only be fitted by an engineer, must be tested and have an approved stamp etc + cost the earth...

Last year my Panasonic Microwave here also took a lot longer, was the same 1x heating element was black, no problem in buying hear, replaced both while I was at it myself.... must get round to take the cover off again as the light has stopped working

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I would like to reiterate the warnings about having the back off your microwave.

Several components remain LETHAL even when the unit is off and the plug removed, there are no second chances when dealing with the power levels living inside these units.

Please take care.

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BANGKOK 27 July 2017 14:02
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