Troubleshooting - Whirlpool YKHMS1850S Use And Care Manual

Try the solutions suggested here first in order to avoid the cost of an unnecessary service call.
Nothing will operate
Has a household fuse blown, or has a circuit breaker
tripped?
Replace the fuse or reset the circuit breaker. If the problem
continues, call an electrician.
Is the microwave oven wired properly?
See Installation Instructions provided with your microwave
oven.
Microwave oven will not operate
Is the door completely closed?
Firmly close door.
Has the microwave oven been inactive and the door
closed for more than 5 minutes?
Open and close the door. See "Start" section.
Is a spacer (on some models) attached to the inside of the
door?
Remove spacer, then firmly close door.
Is the electronic microwave oven control set correctly?
See "Microwave Oven Control" section.
On some models, is the Control Lock set?
See "Control Lock" section.
On some models, is the Demo Mode activated?
See "Demo Mode" section.
Is the magnetron working properly?
Try to heat 1 cup (250 mL) of cold water for 2 minutes at
100% cooking power. If water does not heat, call for service.
See "Assistance or Service" section.
Microwave oven makes humming noise
This is normal and occurs when the power supply switches
the magnetron on and off.
Microwave oven door looks wavy
This is normal and will not affect performance.

TROUBLESHOOTING

Turntable will not operate
Has the tape been removed from turntable hub?
See "Turntable" section.
Is the turntable properly in place?
Make sure turntable is correct side up and is sitting securely
on the turntable support.
Is the turntable support operating properly?
Remove turntable. Remove and clean turntable support and
rollers. Replace turntable support. Replace turntable. Place
1 cup (250 mL) of water on the turntable, then restart
microwave oven. If it still is not working, call for service. See
"Assistance or Service" section. Do not operate the
microwave oven without turntable and turntable support
working properly.
Turntable alternates rotation directions
This is normal and depends on motor rotation at the
beginning of the cycle.
Display shows messages
Is the display showing an "Oven Status" screen, with a
letter/number code and instruction to inform KitchenAid?
The microwave oven has detected an internal problem. It has
run a self-checking program and displayed the error. Call for
service. See "Assistance or Service" section.
Display shows time countdown, but is not operating
Is the Timer in use?
See "Timer" section.
On some models, is the Demo Mode in use?
See "Demo Mode" section.
Tones are not sounding
Are tones turned off?
See "Tones" section.
Steam is coming from the vent grille
Some steam is normal.
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