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Microwave doesn't rotate, internal light off, but heats food

Ewave Microwave Model: KOT-170SW

Unit has always been glitchy, displaying odd characters in display. Now it is turning off and on at random. When it does ''work'' it will heat food, but the internal light doesn't come on and the turntable doesn't rotate.

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  • gholmesnc Nov 26, 2008

    2 follow-up questions: 1) does this explain ALL the erratic behavior including the most important (i.e., turntable doesn't rotate and internal light doesn't come on when door is shut)? 2) What does the ERC look like? I tried to find it at RepairClinic.com and couldn't find it. I have the unit fairly open at the moment and could find it if I know what to look for.

  • gholmesnc Nov 26, 2008

    I have the motor out right now and the post is not broken. Everything is in tact.

  • gholmesnc Nov 26, 2008

    The fuse is okay. It seems to be the link to the power for the whole unit. I say this because when I pull out the fuse, everything goes dead. Put it back in and things work again (but with the problems I mentioned before). The light comes on when the door is opened but not when the unit is running.

  • gholmesnc Nov 26, 2008

    I don't have a lot of confidence in the advice I'm getting. It doesn't seem very well thought out; jumping from one solution to another and then giving up. Hmmm...

  • gholmesnc Nov 26, 2008

    Let me restate the problem:

    1) Microwave heats food, but internal light doesn't come on during operation and turntable doesn't turn.
    2) Internal light does come on when door is open and turntable motor is intact and sounds right when I turn it forcibly.

    3) Display works and buttons respond. However, the unit dies at the end of the cook time regardless of length. It beeps to signal the end of the cook time, then it dies. Several minutes later, the lights come back on.

    4) I have taken off the control panel and exposed the wiring and fuse. Fuse is good and wiring is intact. I have disconnected and reconnected everything I can get my fingers on in case there is a poor connection somewhere.



    These things are expensive to replace and it seems like the kind of problem that results from a faulty electronic component. Does this ring a bell for any one?

  • gholmesnc Nov 26, 2008

    and why would the wiring suddenly be wrong? It came from the factory wired and the wiring has not changed.

  • gholmesnc Nov 26, 2008

    but the motor sounds good (compared to YouTube video) and the light works when the door is open (just not when in operation with door closed).

  • gholmesnc Nov 26, 2008

    I just ran current through the motor and it turns. So that doesn't seem to be the problem.

  • gholmesnc Nov 26, 2008

    I have gone to the links you provided, but still don't know what the ERC is. The CG Industries site doesn't take me anywhere that I can find anything about ERCs. The only place I can see a ribbon in the control panel is a place where it connects directly to the board. I don't see anything that is replaceable there except the whole board.

  • gholmesnc Nov 26, 2008

    That sounds like the most plausible solution yet. That item is $107. Ouch! If I were certain this would fix the problem I would probably do it, but what if it doesn't? I'm out $107 and still have the problem. Hmmmm...

  • gholmesnc Nov 26, 2008

    no problem with soldering or plastic ring or plastic piece on the turntable motor. Everything looks intact. Must be the PC board. This would explain the earlier erratic display characters (but didn't lead to any real malfunctions).

  • gholmesnc Nov 26, 2008

    you sound like you know what you're talking about. There is a box at the bottom of the PC Board/ERC. I don't know what it's called, but it's a common electrical component. It's hundreds of wires coiled around and surrounded by a set of sandwiched metal bands (electromagnet?). Anyway, this think is hot. It doesn't burn me, but I can only hold it for a second or two before having to let go. Does this confirm your diagnosis?

  • gholmesnc Nov 26, 2008

    replacing the PCB would be simple. I've already taken it off and put it back on. What about the hot item at the bottom?

  • gholmesnc Nov 26, 2008

    No. I have the motor out. I can turn it easily by hand. I passed 110 current through it and it turns. So I don't think it's the motor. The PC Board sounds more like it.

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More often than not replacing the whole unit is more economical as excessive heat due to the turntable not turning with a transformer (the secondary winding) receiving power would also overheat unrelated components that degrade the pcb itself. Interlocks -there are many -may have been faulty as well and it takes a special microwave leak detector that know for sure if your microwave oven is safe to use, especially if anyone in the house has a pacemaker. The only check I ever do is the fuse as the price of a new microwave or especially a good used microwave rarely justifies the cost of repair and possible safety hazard.

Posted on Nov 26, 2008

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Http://www.mcappliance.com/service/manualdownloads.asp

use this guide much more helpful. many problems solved..

thank you

Posted on Nov 26, 2008

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It sounds to me that your microwave has had it and its time 4 a new one

Posted on Nov 26, 2008

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Control panel bad.about $100.00 for part, this sounds like the major problem

Posted on Nov 26, 2008

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You have some control board issues, may mean replacing the control board. If you would like the part numbers let me know and I will look them up for you. If you are not experienced with fixing these type of units you should refer this to a service center. There are some very high voltages inside the microwave that can kill or cause serious injury.

Posted on Nov 26, 2008

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If your problem was just the light and turntable, I would suspect one of the door switches (bad contacts due to internal arching or migration of grease into switch) but the problem with the display blanking out and comming back minutes later, and odd figures in the display lead me to feel you have a bad electronic control board. (sometimes called an ERC or electronic range control). It is the electronic board with the digital display attached to it, and usually several little square boxes on it (relays). They do tend to be rather expensive, and if your unit is older, say 10 years, the part may not be available any longer. I personally do not have a source for that brand, so I can't tell you for sure.

Posted on Nov 26, 2008

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This is the problem with electronic control unit which control's the microwave oven signal and responses to the signal ,if this part is defective then it cannot communicate with all signals , this leads to malfunction of the oven ,check any open wires or poor soldering in the wiring and Inspect the plastic drive coupling that the tray sits on, as well as the ring-and-roller assembly, to make sure that they're working properly..........

Good luck...

Posted on Nov 26, 2008

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You have no problem with the wiring or fuses as you been told / your pc control board is bad / it supply power to your turntable, inter-light and display and also the on and off funtion / replace the board to repair it.
Larry

Posted on Nov 26, 2008

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Check the control panel of you microwave. Replace the turnable motor.Click this http://www.fixya.com/Unanswered.aspx Thank you..

Posted on Nov 26, 2008

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The motor which moves the tray needs to be repaired and also the light. Get it checked by repairman. As you have said that the food is heatinng up so it can be repaired easily.

Thanks

Posted on Nov 26, 2008

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  • 98 Answers

This could be because the wiring is bad and it may need to be rewired. Or your light bulb is died and you need to replace it, and the motor for the plate turner might be burnt out and may need a new one put in. But it could be due to poor wiring if your light still does not work and or if you get a new motor.

Posted on Nov 26, 2008

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The unit is probably glitchy because the software that is installed and the micro chips used to run all of the controls of the microwave are messed up. It would be cheaper to get a new microwave. A blown fuse could cause the light not to come on or the turntable not to spin. This could have been caused by an electrical problem by a messed up micro chip and you will definitely have to hurry and get a new one.

Posted on Nov 26, 2008

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  • Jazz Boyce
    Jazz Boyce Nov 26, 2008

    The light is not supposed to be on when the door is closed but only when the door is open. And since you say it is not the fuse, there is probably something wrong with the power supply board. Look for anything burnt. That will be the area where the problem is.

  • Jazz Boyce
    Jazz Boyce Nov 26, 2008

    Since you say you have to turn the turntable forcibly and it moves, it might be jammed in some way that makes it hard for you to move and it will not move otherwise. Check for anything jamming it. Since you say the unit dies after it heats up something, this might be a heat-activated short. Try and look for a loose hanging wire or something burnt.

  • Jazz Boyce
    Jazz Boyce Nov 26, 2008

    That hot electromagnetic produces the microwaves that warms your food. It is supposed to get warm, not too hot, to produce the microwaves.

  • Jazz Boyce
    Jazz Boyce Nov 26, 2008

    That thing at the bottom is the microwave producer that warms up food.

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  • 174 Answers

I'm sure your motor has failed.

Sometimes it a broken post inside the motor, if you like to tinker.

Posted on Nov 26, 2008

  • debroy
    debroy Nov 26, 2008

    replace it....get a new one.

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The random behaviour is because electronic range control is failing. You need to replace the electronic range control (ERC).

Posted on Nov 26, 2008

  • SAM ANDERSON Nov 26, 2008

    Click the line below in order to get details about ERC with proper images .

    Fixya Guide

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