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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.
I would try troubleshooting the "defrost circuit". The behavior sounds like the microwave is cooking in the defrost mode, where it actively cooks then stops allowing the food to rotate and the heat to spread then actively cooking again.
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.
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