Family-Size 1.2 cu. ft. Countertop Microwave Oven

  • 1300 Watt High Power
  • Inverter Technology
  • Inverter Turbo Defrost
  • One-Touch Sensor Cook and Reheat
  • Keep Warm Feature

SpecificationsExpand All

    • SIZE
    • Type
    • Installation
    • Oven Capacity
    • Cooking Power
    • Turntable Diameter
    • Panasonic Inverter
    • Genius Sensor
    • DESIGN
    • Color
    • Control Panel
    • Display Panel
    • Cooking Options
    • STYLE
    • Door Front
    • Door Window
    • Exterior Wrap
    • Door Release
    • Oven Interior
    • Power Settings
    • Multi-Stage Cooking
    • Automatic Turntable
    • Sensor Cook
    • Sensor Reheat
    • Auto Reheat
    • More/Less Control
    • Inverter Turbo Defrost
    • Keep Warm
    • Popcorn
    • Quick Minute
    • Delay Start
    • Timer
    • Power Requirements
    • Cavity Dimensions (H x W x D) inches
    • Unit Dimensions (H x W x D) inches
    • Weight
    • UPC


NN-SN657S is rated 3.3 out of 5 by 6.
Rated 5 out of 5 by from Poweful microwave I bought this microwave a few months ago. So far the microwave has worked well, it heats my food very fast. This microwave seems that it will last for a long time.
Date published: 2012-03-14
Rated 2 out of 5 by from Good, while it lasted Purchased this not quite 2 years ago, and worked well. The defrost and reheat buttons are really convenient. When it started making a low buzz sound yesterday we were hoping it wasn't detrimental as we really like the features of this one, and don't want to have to get another microwave after such a short period of time. Alas, the buzzing got progressively louder, and it bit the dust. As much as I like the microwave while it lasted, going to steer away from Panasonic for the replacement. This is the shortest lifespan for any appliance I've had, or even that my parents have had for that matter.
Date published: 2012-03-05
Rated 2 out of 5 by from Worked Great Then Died This microwave worked great for two and a half years and then just stopped. No warnings, no errors, it just shut itself off and wouldn't start again. No display and no indication it was getting any power at all despite the fact it was plugged into a working outlet. Unfortunately I'll have to buy a new appliance because this one was used daily but is far past warranty. However, I don't think I will be buying another Panasonic product. On a side note to R&D: My previous microwave, a clunky little off-brand model, worked great for 15 years before giving up the ghost. If smaller companies can build dependable products like that, surely a Goliath like Panasonic can match them.
Date published: 2012-01-27
Rated 5 out of 5 by from Great microwave! I have been using this microwave for over a year now and it is still running great! The Inverter technology cooks and reheats my food perfectly and evenly. This is also a very powerful microwave!
Date published: 2012-01-19
Rated 1 out of 5 by from lemon This is the worst piece of cooking equipment I have ever wasted money on, I would not recommend this to anyone. Purchased this microwave 3 weeks ago and it has been nothing but trouble and finally this week the door switch broke. STAY CLEAR OF THIS!!!!!1
Date published: 2010-09-15
Rated 5 out of 5 by from
Date published: 2010-08-18
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  • What should I check if my microwave stops working?

    Check the fuse/circuit breaker for the outlet to see if it has been tripped or blown. Check other outlets to see if there is a GFI (Ground Fault Interrupt) outlet that is on the same circuit as the outlet used for the unit and see if it needs to be reset. Connect the oven to another outlet to see if unit is still operational. If the unit is still not working, please contact a local authorized servicer for diagnosis and repair.

    Click Here for Panasonic Service Locator

  • What should I do if my microwave display is not working?
    Check to make sure unit is plugged into a working outlet by plugging in another device to determine if power is available at the receptacle.
    If power is not available at the outlet check your fuse/circuit breaker, panel.

    Note: Newer homes/buildings are generally wired with GFI (Ground Fault Interrupt) receptacles, if your building is equipped with GFI receptacles be sure to check if the circuit breaker directly on the receptacle has been tripped and requires reset.

    If you determine the outlet has power but the microwave still is not functioning, contact a local Panasonic authorized servicer for repair.

    Click Here for Panasonic Service Locator
  • How do I remove the odor from inside the microwave?
    Combine 1 to 1-1/2 cups (250 - 375 ml) water with the juice and peel of one lemon in a 2 quart microwave safe bowl. Heat contents on high for 5 min.(s). After water finishes boiling, wipe interior of oven with a cloth.

    Click here for video.

  • For some reason my microwave oven displays units of measure in grams instead of ounces. How do I change it back?
    1. Unplug the microwave oven for about 60 Seconds.
    2. Right after you plug the microwave back in, press the *start button (this will initiate/toggle the oven between grams and ounces.
    3. Choose the unit of measure.
    Diagram change units of measure MWO.
    *Note: Depending on the model microwave oven you may need to turn the dial instead of pressing the button to start.
Consumer Product Support and Technical Assistance
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Sat-Sun 10am-7pm EST
Panasonic USA