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Rice cooker died

Discussion in 'Electronic Repair' started by Be, May 6, 2005.

  1. Be

    Be Guest

    Hello,

    We have a Salton Rice Steamer/Cooker Model: RA-3 that has been used less
    than a year and suddenly stopped working. It works very simply - you place
    raw rice and water in an aluminum bowl, then press down on a switch above
    were an AC cord inserts into the unit. This end of the cord is blocky and
    has two pin holes that mate with two protruding pins inside the unit... much
    like an electric griddle's cord.

    Anyway, normally, when this switch is pressed down, it clicks and locks into
    position and a light comes on. After 30 minutes the switch releases and the
    rice is done. There is no timer that I can see in the unit - it must have to
    do with the expansion of some metal trigger from heat over that time frame.

    This light will no longer come on and the cooking process likewise does not
    start. I unscrewed the bottom cap and looked in at the very simple workings
    - nothing seemed to be broken or disconnected. The latch does stay in the
    "on" position when the weight of the full pot is pressing on the hot plate,
    so the spring mechanism involved is not broken. The cooker was not dropped
    and there is no visible damage.

    Anyone have an idea what might be wrong?

    Thanks,
    Bill
     
  2. kip

    kip Guest

    Maybe a Bad Cord !
     
  3. cnctut

    cnctut Guest

    I continually have to replace cords on appliances because my wife likes
    to pull on the wire instead of the plug itself when unplugging from the
    wall socket. Over time the wires in the cord break and the power is
    disconnected. If it were my rice cooker, I'd take Kips suggestion and
    check the cord first.
     
  4. PaPaPeng

    PaPaPeng Guest


    Took some effort to figure that out. The circuit switch is held
    closed by a curie point magnet underneath the central circular cup.
    So long as the rice is aboil the temperature will remain around 100
    deg C, the boiling point of water. When the rice is cooked and fairly
    dry the temperature rises rapidly. Somewhere around 200 deg C say,
    the curie point of the magnet will be exceeded and the magnet will
    lose its magnetism. The spring below the circular cup pushes the cup
    up and breaks the circuit. With the circuit open the pot contents
    will cool and fall below the curie temperature. The switch is ready
    to be set again if you want to warm up the rice.

    The pot must be sized to your cooker as per manufacturer. I had once
    substituted a less battered pot from another brand rice cooker. The
    strange things began to happen. At first it took longer to cook. Then
    it would undercook, leaving half raw rice when the switch triggered
    open.. I had to swith it on again to finish the cooking. Then I
    noticed one of the cooker's legs had sagged/melted. I took a look at
    the heater element and the aluminum had melted in places too. The
    cooker was toast. Took a few minutes to realise that the substiitute
    pot's bottom didn't fully conform to the heater element. The heat
    transfer rate was lessened. Thus the heater had to work harder to boil
    off the water (longer cooking time.) By repeated switching on again
    to finish the cooking, bit by bit the element became hot enough to
    melt the aluminum and the plastic leg.
     
  5. NSM

    NSM Guest

    Interesting. I have a sensor microwave which has a rice setting. Works
    great.
     
  6. Guest

    My guess would be a thermal fuse, since you description of the internals
    as being very simple.

    : Hello,

    : We have a Salton Rice Steamer/Cooker Model: RA-3 that has been used less
    : than a year and suddenly stopped working. It works very simply - you place
    : raw rice and water in an aluminum bowl, then press down on a switch above
    : were an AC cord inserts into the unit. This end of the cord is blocky and
    : has two pin holes that mate with two protruding pins inside the unit... much
    : like an electric griddle's cord.

    : Anyway, normally, when this switch is pressed down, it clicks and locks into
    : position and a light comes on. After 30 minutes the switch releases and the
    : rice is done. There is no timer that I can see in the unit - it must have to
    : do with the expansion of some metal trigger from heat over that time frame.

    : This light will no longer come on and the cooking process likewise does not
    : start. I unscrewed the bottom cap and looked in at the very simple workings
    : - nothing seemed to be broken or disconnected. The latch does stay in the
    : "on" position when the weight of the full pot is pressing on the hot plate,
    : so the spring mechanism involved is not broken. The cooker was not dropped
    : and there is no visible damage.

    : Anyone have an idea what might be wrong?

    : Thanks,
    : Bill
     
  7. Edd Whatley

    Edd Whatley Guest

    Bill:

    My vote is definitely for the units internally mounted and sinke
    thermal fuse also, as I actually was approached by an associate t
    check out his unit, it being inoperative in the same manner.
    ECG’s follow up replacement parts supplier NTE had a replacement uni
    that filled the replacement temp/current specs.
    As for being a cord problem, the unit is probably not old enough fo
    that, and even that requires a lot of coiling/flexing , like an ironin
    cord receives.

    73’s de Ed
     
  8. kip

    kip Guest

    Some people have a Nasty habit of pulling plugs out with the Cord.
     
  9. Be

    Be Guest

    Thermal fuse it was! Replaced it with one from Radio Shack and it has
    already made another batch of rice.

    Thanks for your help and the education you provided.

    Be
     
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