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There might be a problem with door switch for your microwave to be turning off after 3 seconds and the door switch will need replacement on your microwave.
NOT FAMILIAR WITH Lincoln MICROWAVES BUT IF IT RUNS A FEW SECONDS THEN SHUTS OFF IT IS DOING WHAT UNITS WITH A BAD MAGNETRON AND OR INVERTER DO, HAVE THEM BOTH CHECKED OR REPLACE UNIT
Robert, I will post links below that may address your problem. "I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Main control boardIf
your microwave runs for a few seconds and stops, the first thing to
check is the main control board to ensure that a shortage has not
occurred. If the part is defective then it will need to be replaced to
prevent continual shut offs. If this is not the issue, the next step
would be to check for a faulty touchpad.
Touchpad/Control panelIf
the control board is not the issue and your microwave continues to shut
off after running for only a few seconds, the next thing to check is
your touchpad, which is also known as a control panel. Although uncommon
for this issue, symptoms are usually that the display and some buttons
are working properly; however, when selected some buttons are not
functioning. If this is the case the touchpad will need to be replaced.
Main control boardIf
your microwave runs for a few seconds and stops, the first thing to
check is the main control board to ensure that a shortage has not
occurred. If the part is defective then it will need to be replaced to
prevent continual shut offs. If this is not the issue, the next step
would be to check for a faulty touchpad.
Touchpad/Control panelIf
the control board is not the issue and your microwave continues to shut
off after running for only a few seconds, the next thing to check is
your touchpad, which is also known as a control panel. Although uncommon
for this issue, symptoms are usually that the display and some buttons
are working properly; however, when selected some buttons are not
functioning. If this is the case the touchpad will need to be replaced.
Main control boardIf
your microwave runs for a few seconds and stops, the first thing to
check is the main control board to ensure that a shortage has not
occurred. If the part is defective then it will need to be replaced to
prevent continual shut offs. If this is not the issue, the next step
would be to check for a faulty touchpad.
Touchpad/Control panelIf
the control board is not the issue and your microwave continues to shut
off after running for only a few seconds, the next thing to check is
your touchpad, which is also known as a control panel. Although uncommon
for this issue, symptoms are usually that the display and some buttons
are working properly; however, when selected some buttons are not
functioning. If this is the case the touchpad will need to be replaced.
see the diagram attached and fix it. God bless you
Main control boardIf
your microwave runs for a few seconds and stops, the first thing to
check is the main control board to ensure that a shortage has not
occurred. If the part is defective then it will need to be replaced to
prevent continual shut offs. If this is not the issue, the next step
would be to check for a faulty touchpad.
Touchpad/Control panelIf
the control board is not the issue and your microwave continues to shut
off after running for only a few seconds, the next thing to check is
your touchpad, which is also known as a control panel. Although uncommon
for this issue, symptoms are usually that the display and some buttons
are working properly; however, when selected some buttons are not
functioning. If this is the case the touchpad will need to be replaced.
Ge Spacemaker comes on ok but after a few seconds the noise level goes up significantly and it does not heat. It keeps running until the time runs out but it doesn't heat.
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