Question about Samsung SMH7174BC Microwave Oven

4 Answers

Light and fan trouble

Everything works fine except the cooktop lights, which wont come on at all, and the fan, which only works in Turbo mode. Have replaced the bulbs, but still not change in status.

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  • rthawley Mar 02, 2008

    Socket has no stain. In fact, there are two undercounter bulb sockets, and neither bulb works. Also, the fan has three setting, low, high and turbo. The fan only runs on turbo setting. While not 100% certain, it appears that both these problems began at the same time.

  • rthawley Mar 04, 2008

    both bulbs have been replaced but no change in status. Also, fan has three speeds (high, low, turbo) but only works on turbo setting. We think both problems started at the same time.

  • rthawley Mar 05, 2008

    Have checked the board and can see no obvious signs of damage. Also, both ceramic fuses are good. Anyone have any other suggestions besides purchasing new microwave.

  • rthawley Mar 05, 2008

    I'm aware of this, its from my manual. The problem is when you press the button once, the fan runs at turbospeed, press it twice and the display says high speed but the fan stops, press the button twice and the display reads low but the fan does not run.

  • rthawley Mar 06, 2008

    do you happen to know if there is an easy way to access the board.? Your's is the first response that makes sense because it addresses both problems which I'm sure have to be related.

  • rthawley Mar 06, 2008

    already have the guide. There is apparently a small board that controls both the lights and the fan, but I don't know where its located. Do you know where I can find a schematic of the oven?

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The vent fan removes steam and other vapors from surface cooking and protects the microwave from too much heat rising from the cooktop below it. It automatically turns on if it senses too much heat.
Press the Vent Fan Turbo/Hi/Low/Off button once for turbo fan speed, twice for high fan speed and three times for low fan speed or four times to turn the fan off.
If you have turned the fan on, you may find that you cannot turn it off. The fan will automatically turn off when the internal parts are cool. It may stay on for 30 minutes or more after the cooktop and microwave controls are turned off.
The Vent Fan will operate only in Hi/Low/Off mode while the microwave is working.

Posted on Mar 05, 2008

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Those are both controlled by a small board in back of the unit, which may have gone bad.

Posted on Mar 05, 2008

  • Patrick Michaels
    Patrick Michaels Mar 06, 2008

    nope..not what I'd call easy. Those units are built to stay together. What's your technical skill level anyhoo?

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If you are comfortable opening the machine, look at the boards for signs of burnt components or cracked or loose solder joints.

As a side note, I recently bought a 1.1 cubic foot 1100W Panasonic microwave oven from Walmart for $80 CAD so good ovens are available for cheap these days. Might be worth it to get a new one with Warranty.

Posted on Mar 04, 2008

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Fan works when component heat is higher so its normal.

Posted on Mar 01, 2008

  • ExpressFiX
    ExpressFiX Mar 01, 2008

    About the bulb, I believe socket might have some stain, unplug the Microwave and clean the socket also check the connection.

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