Question about Microwave Ovens

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Oven control board 7021-0625

I have an oven with a control circuit board pair identified as MPC 7021-0625-03 and 0721-0626-03. Are these still available as replacement parts?

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  • chrism415 Nov 04, 2008

    This is an electric oven, not a microwave.

  • William Miller
    William Miller May 11, 2010

    Please reply back with your brand and model number so we can help you.

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1 Answer

The oven model is an Australian Westinghouse PAD630TF. Westinghouse Australia used to offer an exchange repair service but no longer do so. The oven is about 20 years old, and in very good condition apart from this control board failure.

Posted on Nov 09, 2008

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1 Answer

Power but blank screen


Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean, solder and reset the board. Now identify the parts by clicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html

If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron. Check this link to know how a microwave works:

http://www.espares.co.uk/advice/microwave/a/5/1443/how-a-microwave-oven-works.html

Jan 21, 2013 | GE Microwave Ovens

1 Answer

Oven does not work flashing door locked


Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean, solder and reset the board. Now identify the parts by clicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html

Jan 12, 2013 | GE Microwave Ovens

1 Answer

Microwave Oven displaying system error


Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean, solder and reset the board. Now identify the parts by clicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html

Jan 11, 2013 | Microwave Ovens

1 Answer

Displaying System Error


Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean, solder and reset the board. Now identify the parts by clicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html

Jan 11, 2013 | Samsung SMH8165W Microwave Oven

1 Answer

My Sharp Micro Convection Model R1870 fan behind the touch panel keeps running for 50 seconds after the microwave turns off,. this is not the vent fan. it also runs for 50 seconds when you turn the...


If the fan seems to run even after the microwave had completed the cycle, then it is possible that the drive to the fan is having a time delay. Also it has to be made sure that the magnetron has been cut OFF power or else it is not a good situation. You will have to remove the control panel and check on the board, check the drive to the fan, since the processor cuts off the fan and magnetron at the same time the fan circuit must be traced. Look to the circuit after identifying the fan wiring and back check using a multimter if you are able to trace. If not take help as this can be harmful in case the microwave works till the fan cuts off. A faulty capacitor on the board can create this time delay.

Oct 11, 2011 | Sharp R-1870 Convection/Microwave Oven

1 Answer

Light in microwave does not light up


Possible that the lamp has fused or burnt out, the controller output is absent or that the switch is faulty.
Please check lamp, check the ouput if the microwave works as it is parallel to this circuit.
For tips to identify the parts check :

http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html

Aug 30, 2011 | Sharp Microwave Ovens

1 Answer

GE Spacemaker Microwave JVM 1542WF 002 : everything works except the turntable and it won't heat. Have tried the TT on/off nothing happens. Have tried the power setting...nothing happens.


Usually, power for the turntable motor and the magnetron tube (the microwave source) are controlled by a couple of things. One is a relay on the control circuit board, and the other is a switch that's operated by one of the door latches. It's possible the control board has gone bad or bad connections have developed. It's also possible the door switch has failed or is out of adjustment and the oven thinks the door isn't closed.

Diagnosing this kind of trouble may require working on the oven while it's operating. MICROWAVE OVENS USE HAZARDOUS VOLTAGES WHICH CAN KILL YOU. You might want to leave the repair to a professional because of safety concerns. Unless the circuit board requires replacement, it's probably worth having this repaired. Unlike some repairs, this one won't cost as much as a new oven.

Jun 22, 2011 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Came in today; our spacemaker ge microwave xl 1400 would not light up, turn table would not turn, no date or time or anything registering on panel


  1. Check the circuit breaker.
  2. Verify that the outlet to oven has power (plug in a trouble light or other small device).
  3. If you have power there, take the oven off the wall, remove the top cover and check whether you have power at the controller board. (If you don't know where to put the voltmeter leads, take the oven to an appliance tech to perform these tests.) If you power at the low voltage transformer, the board has failed.
  4. If not, check the three thermal cutouts and the fuse. One thermal cutout is located on top of the oven, most likely under the light bulb cover. The next is fastened to the magnetron, and the last is down near the bottom just behind the controller module. If any of these is open, the oven will not work. If the fuse is blown, look for a short circuit before replacing it (check the varistor on the controller board first). The varistor is listed as a separate repair part; don't get soaked for a controller board if this is bad.

Jan 17, 2011 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Replacing a circuit board on a microwave


It's very easy to do if you can get the circuit board. Take the two screws out of the plastic fan grill and pop it off. There should be one screw above the control panel. Take that off and the panel should pop off by slightly pushing up. Unhook all the wires and unscrew the board. Put the new board in and your done.

Jan 18, 2009 | Whirlpool GH4155XP Microwave Oven

1 Answer

Getting to the circuit board


First, remove the plastic vent / louver going across the top of the unit. Once that's off, you should see one phillips screw at the top of the control panel frame. Remove that screw, then lift up and out on the control panel assembly. You're there!

Jul 13, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

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