Question about LG Microwave Ovens

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Lg microwave starts and turns off

Micro starts and turns off after about 6-7 seconds. It displays F-9 when it shuts off. any idea what could be wrong?

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This is usually caused by a bad inverter, magnetron, control board, or a connection between them.

Due to the lethal voltages used and produced in inverters, I do not recommend that an inexperienced person work on these.

But to order Goldstar / L.G. parts, visit Encompass. You'll probably have to call them for price and availability for your model's parts.

For more Goldstar / LG / L.G. help, call 1-800-243-0000 (M-F, 7am-8pm CT, Sat 8-5 CT) and choose the appropriate prompt from the menu or visit here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Jan 03, 2009

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Ive got a d90d25eslr111-b1 micro combi,i poached an egg ani ie exploded in the micro,it blew the electic and went off,if i swith it on its ok,as soon as i shut the door it fuses the electric. why plea


see this causes and fix it. God bless you
If the microwave runs for a few seconds and stops the thermostat might be defective. Watch our video on testing thermostats.
If the microwave runs for a few seconds and stops the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.
If the microwave runs for a few seconds and stops the high voltage transformer might have an intermittent short. This is not common. Check other components related to the microwave symptom first.
If the microwave runs for a few seconds and stops the touchpad might be at fault. This is not common. Generally speaking, if the dishwasher display is working and some of the buttons respond correctly but some don't, the problem is with the touchpad.
If the microwave runs for a few seconds and stops the touchpad and control panel might be defective. There are several other components that can cause this problem, be sure to check any other components before replacing this board.
If the microwave runs for a few seconds and stops there may be a short circuit in the main control board. Check other components first, these boards are often misdiagnosed.
If the microwave runs for a few seconds and then shuts off, a door switch might have failed intermittently. Check each of the door switches for any signs of overheating, arcing, or burning. Also check each of them for continuity. Replace any of the switches that is visibly damaged or that only has continuity intermittently.

Sep 27, 2012 | Morphy Richards Microwave Ovens

1 Answer

Our microwave stops after a few seconds and code comes up F9


It of course depends on the model number, but here's some discussion from other boards:

F-9 on this microwave IS inverter related. There is a service tech troubleshooting document stuffed in behind the control board cover which has some testing proceedures. My problem was the magnatron and checked out bad with the help of this document. It would run for a few seconds making clicks and then say F-9. It has been working great since I replaced the magnatron PN 6324w1a002c.

f9 model 721.63764300
Kenmore Elite 36 " over tne counter microwave is supplied by LG made by Gold Star, made in China. It's main problem is the high voltage inverter board supplyed by Sears Parts. If you get a F-9 code on your microwave display screen and the micro quits it's probably this board. Reset the machine by pulling the power plug and waiting an hour. If it is the high voltage board is at fault it will probably fail after 45 seconds of start up. This part is really hard to get at but is less than $100. A qualified technician should be able to remove and repair this item in less than hour. Some techs will quote you $300 labor, don't buy it, it should cost a $100 or less. No need to buy another microwave.

To find helpful exploded view diagrams and get part numbers, you can just enter your full model number at the Sears parts site.

But Sears parts can usually be obtained for far less here by entering either the part number.

A full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########.


We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Sep 07, 2010 | Kenmore Microwave Ovens

1 Answer

Hit the start button and runs for 6 sec then code F-9 can't find manual


You didn't mention your brand or model, but F9 code on an LG sometimes means either a bad door switch or a loose door switch mount.

See this file on door switches.

If a switch is all you need, we offer a universal type for only $5 postpaid which you can order here.

Here is more info on F9 as it relates to some brands and models:

Sears Kenmore Whierlpool LG 721.63683300

"F-9 on this microwave IS inverter related. There is a service tech troubleshooting document stuffed in behind the control board cover which has some testing proceedures. My problem was the magnatron and checked out bad with the help of this document. It would run for a few seconds making clicks and then say F-9. It has been working great since I replaced the magnatron PN 6324w1a002c."

"f9 model 721.63764300
Kenmore Elite 36 " over tne counter microwave is supplied by LG made by Gold Star, made in China. It's main problem is the high voltage inverter board supplyed by Sears Parts. If you get a F-9 code on your microwave display screen and the micro quits it's probably this board. Reset the machine by pulling the power plug and waiting an hour. If it is the high voltage board is at fault it will probably fail after 45 seconds of start up. This part is really hard to get at but is less than $100. A qualified technician should be able to remove and repair this item in less than hour. Some techs will quote you $300 labor, don't buy it, it should cost a $100 or less. No need to buy another microwave.
"

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Jul 02, 2010 | LG LMVM1945 Microwave Oven

1 Answer

My Kenmore Elite Ultra Wave Technology microwave is displaying an F-9 error. What does that mean?


Here are a couple of quotes from another forum:

"Kenmore Elite 36 " over tne counter microwave is supplied by LG made by Gold Star, made in China. It's main problem is the high voltage inverter board supplyed by Sears Parts. If you get a F-9 code on your microwave display screen and the micro quits it's probably this board. Reset the machine by pulling the power plug and waiting an hour. If it is the high voltage board is at fault it will probably fail after 45 seconds of start up. This part is really hard to get at but is less than $100. A qualified technician should be able to remove and repair this item in less than hour. Some techs will quote you $300 labor, don't buy it, it should cost a $100 or less. No need to buy another microwave."

"F-9 on this microwave IS inverter related. There is a service tech troubleshooting document stuffed in behind the control board cover which has some testing proceedures. My problem was the magnatron and checked out bad with the help of this document. It would run for a few seconds making clicks and then say F-9. It has been working great since I replaced the magnatron PN 6324w1a002c."

Note that part numbers mentioned may not for your model.

You can usually find exploded views and order parts by entering your model number at the Sears parts site.

BUT once you have the part number from the Sears parts site, you can often get the parts cheaper here

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

May 25, 2010 | Kenmore 63662 / 63664 / 63669 Microwave...

1 Answer

What does f-9 mean


F9 on most modern Kenmores (made by LG) is inverter-related or related to the failure of another part in the high voltage section, such as the magnetron.

Some chatter from other boards:

"F-9 on this microwave IS inverter related. There is a service tech troubleshooting document stuffed in behind the control board cover which has some testing proceedures. My problem was the magnatron and checked out bad with the help of this document. It would run for a few seconds making clicks and then say F-9. It has been working great since I replaced the magnatron PN 6324w1a002c."

"f9 model 721.63764300
Kenmore Elite 36 " over tne counter microwave is supplied by LG made by Gold Star, made in China. It's main problem is the high voltage inverter board supplyed by Sears Parts. If you get a F-9 code on your microwave display screen and the micro quits it's probably this board. Reset the machine by pulling the power plug and waiting an hour. If it is the high voltage board is at fault it will probably fail after 45 seconds of start up. This part is really hard to get at but is less than $100. A qualified technician should be able to remove and repair this item in less than hour. Some techs will quote you $300 labor, don't buy it, it should cost a $100 or less. No need to buy another microwave."

Note: part numbers mentioned in the text above may not the same as yours.

You can find helpful exploded views and part numbers on the
Sears parts site, but once you have the part number, you can often get the parts cheaper here.

Otherwise, you can contact Sears through their parts site link above to arrange service.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Jan 09, 2010 | Kenmore 63683 Stainless Steel 1200 Watts...

1 Answer

On the face of the microwave that displays the time, we just noticed ////////////along the bottom of the display under the time, we unplugged the microwave and tried to reset it, but no change


ok if memmory serves me correct
press the pause clear button with start button at same time
holding them for 5 seconds the micro should beep then press1 3 5 7 for the reset micro screen its been a while since i serviced a micro but i believe this is correct display reset config for micro

Jun 02, 2008 | GE Microwave Ovens

1 Answer

Microwave Fan won't shut off, no display


Depending on which brand you have I would think that the Thermal switch on top of the magnetron or one of the door switches has probably given up the ghost. However, if the display does not come on you probably have a micro or Psu fault on the display panel. Not to be attempted if you are not familiar with microwaves or electronics. Please unplug before opening. Good Luck, JUS004

Jan 05, 2008 | Microwave Ovens

2 Answers

Shuts down


check control circuit , and thermal sensors, check every thing, may be touchpad,

Nov 13, 2007 | Kenmore 80883 Microwave Oven

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