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Re: F-9 error on LG microwave
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
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Microwaves are not supposed to be worked on unless you are trained. They have security screws for a reason. And to have it running with the cover of is so dangerous. Microwave energy can make you blind in about 15 seconds. There is thousands of volts in the capacitor which can easily stop your heart and the core of the magnetron is a poisonous heavy metal.
Put it back together and give it to a trained technician.
This error code F7 on KitchenAid microwave is about a function key that is stuck on ERC. You will have to Replace control board (also called ERC or clock) to fix the problem. In case you will have to buy a replacement part you may contact Sears for the replacement part at 1-800-252-1698; M-F 6:30 AM-10:30 PM - Sat 7:00 AM-9:30 PM - Sun 7:30 AM-9:30 PM - All times Central.
Has been listed as a possible door latch or invertor problem. The main pcb for this model is however no longer available. You will need to get it looked at as microwave faults and home repair don't go together, they can be lethal.
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.
Please do rate the solution as "FixYa" if found useful and revert for further assistance.
Hi, 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.
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
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