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.

Posted by sgarcz on

  • 10 more comments 
  • 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!

  • Anonymous 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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1 Answer

William Miller

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  • LG Master
  • 9,179 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 http://us.lge.com/support/support.jsp

Posted on Sep 22, 2007

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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.

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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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