Whirlpool MH1170XST Use And Care Manual page 18

Tones are not sounding
Are tones turned off?
See "Tones" section.
Steam is coming from the vent grille
Some steam is normal.
Fan running slower than usual
Has the microwave oven been stored in a cold area?
The fan will run slower until the microwave oven warms up to
normal room temperature.
Fan running during microwave cooking
This is normal. The fan comes on at low speed to cool the
microwave oven. See "Vent Fan" section.
Fan comes on during cooktop usage
This is normal. The fan automatically comes on to cool the
microwave oven if the temperature from the cooktop below
gets too hot. See "Vent Fan" section.
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Cooking times seem too long
Is the cooking power set properly?
See "Microwave Cooking Power" section.
Are large amounts of food being heated?
Larger amounts of food need longer cooking times.
Is the incoming voltage less than that specified in
"Microwave Hood Combination Safety?"
Have a qualified electrician check the electrical system in the
home.
Radio, TV or cordless phone interference
Is the microwave oven plugged into the same outlet?
Try a different outlet.
Is the radio or TV receiver near the microwave oven?
Move the receiver away from the microwave oven, or adjust
the radio or TV antenna.
Are the microwave oven door and sealing surfaces clean?
Make sure these areas are clean.
Is the cordless phone frequency 2.4 GHz?
Some 2.4 GHz-based cordless phones and home wireless
networks may experience static or noise while the microwave
oven is on. Use a corded phone, a different frequency
cordless phone or avoid using these items during microwave
oven operation.