Question about LG LMVM1945 Microwave Oven

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F-9 error on LG microwave

When I turn on the microwave there is a steady ticking sound and a few seconds later it stops and shows F-9 error message.

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  • Anonymous Dec 26, 2007

    We have the same problem with LG LMVM1945. The clock runs for 6 sec with a steady clicking sound and the F-9 code is displayed. We have unplugged power to the microwave for 15 min with no effect.

  • Anonymous Jan 30, 2008

    I had the same problem. The microwave would run for 10 seconds, then stop and display an F-9 code. It was a bad magnetron. The magnetron is covered by a 10 year parts warranty. I had to take the microwave to the repair shop and pay $85 for labor. It would have been $215 for the tech to come to the house to fix it. The microwave is only 22 months old. No help from LG.

  • nomolgfme Feb 13, 2008

    6 seconds the oven turns on and stops and display f-9 called lg services lady play dum and said to turn off oven and restart to no avail?They must know about this problem by now!!! No more lg for me forever!!!!!!!!

  • keithwil Feb 21, 2008

    Same problem here too. The microwave runs for about 10 seconds, stops, error code F-9 displays. Does anyone know for sure what this error means?

  • tcmurph Jun 22, 2008

    I turn on microwave, it shuts down after 6 sec. with error code F-9. LG was no help. What is more cost effective,repairing or junking it and buying a new one.?

  • magnagroup Sep 12, 2008

    Runs a few seconds. Shuts down. F-9. Not surprised. It's been problems since day one. Not getting fixed again and NEVER buying LG.

  • Anonymous Oct 26, 2008

    F-9 code appears after a few seconds, unit about 18 months old. Called LG they told me to unplug the unit and wait 15 minutes. No improvement.

  • easllc Apr 09, 2009

    F-9 appears 10-30 seconds after responding to selecting cooking instructions. It will cook using 30 seconds intervals repeatedly-very time consuming!

    When it first started I thought I smelled something burning - not food!

  • Rick Huskisson Apr 11, 2009

    Microwave runs for 5-10 seconds, then I start hearing a clicking sound at a 1 second interval - after about 3 clicks, the microwave shuts off and displays F-9,

  • Anonymous Apr 23, 2009

    The notorious F-9 error about 6 seconds into the cycle.

  • amebud May 03, 2009

    I have the exact same issue with an F-9 error message that has been described. Unit is about 2 years old. Haven't been able to find a response online as to what an F-9 error is. Still looking...

  • btkaplan529 May 13, 2009

    Microwave runs for 10 seconds then stops, showing F-9 on screen.

    Does anyone know how to fix this without calling a repair service?



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  • 9,098 Answers

This is a problem with the inverter or magnetron. Due to the lethal voltages involved, I do not recommend that a person without training and experience ever work on these models. You can find support for service or parts at

Posted on Sep 22, 2007


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Since this an LG microwave, an F9 error when the inverter module fails. Unfortunately, other parts could cause the inverter to read as a failure. A bad magnetron, relay 2 or door switches or the connections between the various parts could be bad. Since the microwave is starting, the switches are the least likely culprit. However, it's hard to determine if the inverter or the magnetron is bad without replacing one part. Then the other if the first repair doesn't solve the problem.

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3 things can fail - the control board, the inverter board, or the magnetron. If the microwave runs for about 7 seconds with a ticking sound..then stops and shows "F-9", it is the magnetron that has failed. The fact that the unit starts and runs with the TICKING SOUND means the control board is sending signal to inverter board and the inverter board is sending signal to magnetron. Magnetron is covered by full 5 year warranty, inverter board is only 3 years.

If this is not the case then it could be a defective control board, inverter or line voltage too high.

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F-9 error code indicates a defective control board, inverter or line voltage too high. f the microwave runs for about 7 seconds with a ticking sound..then stops and shows "F-9", it is the magnetron that has failed. The fact that the unit starts and runs with the TICKING SOUND means the control board is sending signal to inverter board and the inverter board is sending signal to magnetron. Magnetron is covered by full 5 year warranty, inverter board is only 3 years.

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If this is a "SmartWave" branded microwave oven then F9 is an error that indicates an inverter board or magnetron has failed. Either way.. Try this...With the F9 error cleared, start the oven and listen for a ticking sound. The inverter will attempt to 'fire' the magnetron 5 times.(ticking sound). If can hear ticking, replace magnetron....Else in may be a door switch problem

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F9 code can mean something different depending upon the particular model.....
1.) IF your Microwave uses "UltraWave technology"/"SmartWave technology"...Then either the Magnetron has failed or the Inverter board has failed OR maybe the control board has failed (HUH?).
2.) IF your Microwave does NOT use "UltraWave technology"/"SmartWave technology" then one or more of the door switches has failed.

** "UltraWave technology"/"SmartWave technology" **
I'll explain a few things about this wonderful technology...
The control board (accepts the pushbutton commands) has to talk to the inverter board to tell it how much power should be applied to the magnetron. The inverter board will then power the magnetron and inform the control board if the magnetron is working OK.
If there is something wrong with the magnetron or inverter board or a there is a communication breakdown between the control board and the inverter board...WA-LA-----F9----

A pretty reliable test for the Magnetron is to operate the oven and listen for a ticking sound 5-6 times about a second apart. If you can hear the ticking....The magnetron has failed..if no ticking, the control or inverter board failed.

Note: This 'technology' may come in other flavors as well

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Need to know the entire model # on the microwave.

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