# My microwave continues to run 2-3 seconds after cook time. It doesn't seem normal but it works fine otherwise

Once the cook time is set and the start button is pressed, the microwave continues to run fine until the end of cook time. It beeps 2 or 3 times and after the beeping, it will shut off. I don't think I have seen this on another microwave, so I don't think it is normal, but it works great otherwise. It is a used microwave, so there is no warranty.

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Microwaves are cheap, if you are worried replace it, With what i k now about electronic clocks I am willing to bet it's not a safety issue.

If you want to be sure you could measure the amount of current it is drawing from the outlet and compare this with the specifications on the back of the microwave. Either get a "kill-a-watt" device, a multimeter with a current probe, or if it draws less than ten amps according to the sticker on the back you could use a regular multimeter to measure the current by hooking it up in series. The "kill-a-watt" is a brand name for a device that plugs into the outlet and then you would plug the microwave into. It will measure the amount of electricity it uses and display it on a screen. This device or the current probe would be the safest as you don't touch the wires. Hooking up the multimeter in series requires splicing wires.

Posted on Apr 04, 2015

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The easy answer is to shorten the time you set. But be careful not to open the door when food is still cooking, or else you will expose yourself to unnecessary amounts of radiation.

Posted on Apr 05, 2015

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Sounds like is what's happening:

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http://031d26d.namesecurehost.com/mwd/safety.txt

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see the next causes. God bless you
Diode The high voltage diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron which emits the energy that cooks the food. If the diode burns out, a lower A/C voltage reaches the magnetron, which is not sufficient to power the magnetron. When the diode fails it is often visibly burned out. If it appears to be good, it can be tested with a volt-Ohm meter capable of testing diodes. High voltage diodes frequently fail and are one of the most common points of failure in a microwave oven.

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Thermal Fuse If the microwave doesn't heat the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

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### Khhc2090s trouble

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I would first check the door switches and their mounts. See this help file.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

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The owner's manual is here. On page 10 we find:

COOKING IN ONE STAGE
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OPERATION(CONTINUED)
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