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Microwave won't run

My microwave runs for 7 seconds and then it stops and displays f-9 in the display window.

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  • smokewhite00 Aug 18, 2008

    I am having the same problem, my microwave runs for 7 seconds then stops displaying F9 on the control panel.

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  • Microwave Ovens Master
  • 8,820 Answers

F9 code means either a bad door switch or a loose door switch mount.

If you or someone you know decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

(If not, please reply back with your brand and model number so we can help you.)

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

Posted on Aug 09, 2008

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Microwave runs for 5 seconds then shuts down displaying F9 HELP


If the microwave runs for a few seconds and stops the touchpad might be at fault. This is not common. Generally speaking, if the microwave display is working and some of the buttons respond correctly but some don't, the problem is with the touchpad

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GE spacemaker microwave turns off during cooking and display goes black


Step 1:


Door Switch




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


mwswitchtest2.jpg

Step 2:

Main Control 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.


Touchpad and Control Panel




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.

Touchpad




If the microwave runs for a few seconds and stops the touchpad might be at fault. This is not common. Generally speaking, if the microwave display is working and some of the buttons respond correctly but some don't, the problem is with the touchpad.

High Voltage Transformer




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.

Thermostat




If the microwave runs for a few seconds and stops the thermostat might be defective. Watch our video on testing thermostat

Step 3:

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Step 4:

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Step 5:

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Step 6:

use the DVOM tester and fix it. God bless you

Feb 08, 2013 | Microwave Ovens

1 Answer

Alarm list says motor rotation and cuts off


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 | Microwave Ovens

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Microwave was run empty and now it won't run. Display works but no fan or microwave. What to do?


The magnetron does not fair well when running empty, the thermal fuse usually kicks in if a metal object was put in by mistake, but should be checked along with the door switches.

May 31, 2012 | Panasonic Microwave Ovens

1 Answer

My Kenmore Elite over the range microwave model 85293 will only run for a few seconds and then it atuomatically stops and says F-9 on the display pad. It does not heat anything. What does F-9 mean?


Just had this happen - the repair guy says it is the inverter. And they have stopped making the part so it cannot be fixed!!! When did you buy your unit?

Jul 03, 2010 | Microwave Ovens

1 Answer

Model 72180883400


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.

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1 Answer

We set the cook time and push START, the oven runs for 30 seconds then stops,then (F-9) appears in the display window. What does this mean? Please send me an answer! Thank You, Tom Clegg PS...


What brand is your microwave? I looked under panasonic and kenmorer because of the numbers you gave but can find nothing under either. I need:

The Brand (complete Name)
The model(Complete model name
Model #

Please have another look. :0)

Aug 12, 2008 | Microwave Ovens

2 Answers

F-9


Need to know the entire model # on the microwave.

Oct 05, 2007 | Microwave Ovens

1 Answer

Shuts down after running about 8-9 seconds.


We'd need the full model number to be sure, but it sounds like an inverter failure. Due to the lethal voltages involved, I do not recommend that a person without training and experience ever work on these models. I would call Sears for service. See http://www.sears.com

Sep 15, 2007 | Kenmore 80883 Microwave Oven

1 Answer

4205 stops after a few seconds, beeps, every segment of every digit lights up.


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