Jenn-Air JMC8127DD Microwave Oven Logo
Anonymous
Anonymous Posted on Jun 20, 2010
Answered

Microwave oven was very hot and shut down with blank display.

Microwave oven was very hot due to thermal oven below being on in the cleaning cycle. After a few seconds of heating liquid in the microwave, it shut off and display went blank. Same after cooling and same after removing and returning power. Owner's manual says there is an auto resetting thermal device, but it has not reset. What to do?

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  • Anonymous Jun 26, 2010

    Jennair combo oven/microwave. Micro plugs into oven for power. 20A breaker for micro receptacle was tripped. Lesson: don't use microwave while oven in clean cycle.

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2 Answers

William Miller

William Miller

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  • Jenn-Air Master 9,179 Answers
  • Posted on Jun 26, 2010
William Miller
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For future reference, I always recommend that you turn on the microwave's hood vent exhaust fan whenever you're cooking on the stovetop or oven.

Depending on the brand and model, there will be either a thermal cutout or thermostat on or near the magnetron. There is also one on top of the oven chassis ceiling, but under the outer cover.

Either device may have opened.

In many brands there is a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

Accessing some components (especially the oven cavity thermostat / thermal cutout) for testing and possible replacement will require you to remove the oven from the wall.

If so, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.

You can download GE owner's manuals and installation instructions here.

You can download owner's manuals and installation instructions for several brands (including Amana, Frigidaire, Jenn-Air, Kitchenaid, Litton, Maytag, Roper, Tappan, Thermador and Whirlpool) here.
You can find links to helpful exploded view diagrams and part ordering help here.

I recommend that you bookmark that link to your favorites.We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer

Testimonial: "Tnx. 20A brkr. on therm. oven tripped."

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  • Expert 228 Answers
  • Posted on Jun 20, 2010
Chuck
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M/Ws usually have a auto resetting thermostat on the magnetron and a one time thermal fuse for the oven cavity. This fuse senses the heat leaving the oven. If the case was very warm, it could have melted this fuse rendering the oven dead.

Testimonial: "Tnx. 20A bkr. on therm. oven tripped."

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Related Questions:

0helpful
2answers

Ran the microwave empty...it shut down. Is there a reset button
You could have burned something out on unit. Check fuse or contact GE. Look in manual for trouble shooting tips.
Read full answer
Jun 13, 2016 • GE Spacemaker JVM1640SJ Microwave Oven
tip

Troubleshooting Guide
  • Problem: Totally dead oven.
    Possible causes:
    1. No power to outlet (blown fuse or tripped breaker or GFCI).
    2. Blown main fuse - likely due to other problems.
    3. Open thermal protector or thermal fuse.
    4. Defective controller or its power supply.
    5. Clock needs to be set before other functions will operate (some models).

  • Problem: Totally dead oven after repair.
    Possible causes:
    1. Cabinet screws replaced in incorrect location (safety interlock not engaged).
    2. Any number of screwups. :)

  • Problem: No response to any buttons on touchpad.
    Possible causes:
    1. Door is not closed (some models).
    2. You waited to long (open and close door to wake it up).
    3. Controller is confused (pull plug for a minute or two to reset).
    4. Defective interlock switches.
    5. Faulty controller or its power supply.
    6. Touchpad or controller board contaminated by overenthusiastic cleaning.
    7. Defective/damaged touchpad.

  • Problem: Oven runs when door is still open.
    Possible causes:
    1. Damaged interlock assembly.
    2. Cooling fans (only) running due to bad sensor or still warm.

  • Problem: Oven starts on its own as soon as door is closed.
    Possible causes:
    1. Defective triac or relay.
    2. Controller is confused (pull plug for a minute or two to reset).
    3. Defective controller or its power supply.
    4. Touchpad or controller board contaminated by overenthusiastic cleaning.
    5. Defective/damaged touchpad.

  • Problem: Oven works but display is blank.
    Possible causes:
    1. Defective controller or its power supply.
    2. Broken display panel.
    3. Oven needs to be reset (pull plug for a minute or two to reset).

  • Problem: Whacked out controller or incorrect operation.
    Possible causes:
    1. Previous or multipart cook cycle not complete.
    2. Controller is confused (pull plug for a minute or two to reset).
    3. Defective controller or its power supply.
    4. Touchpad or controller board contaminated by overenthusiastic cleaning.
    5. Defective/damaged touchpad.
    6. Defective sensor (particulalry covection/mirowave combos).

  • Problem: Erratic behavior.
    Possible causes:
    1. Previous or multipart cook cycle not complete.
    2. Bad connections in controller or microwave generator.
    3. Faulty relay - primary (or HV side, much less commonly used).
    4. Defective controller or its power supply.
    5. Bad contacts/connections on mechanical timers. Intermittent fuse.
    6. Power surge at start of cook cycle confusing controller.
    7. Microwave (RF) leakage into electronics bay.

  • Problem: Some keys on the touchpad do not function or perform the wrong action.
    Possible causes:
    1. Touchpad or controller board contaminated by overenthusiastic cleaning.
    2. Defective/damaged touchpad.
    3. Controller is confused (pull plug for a minute or two to reset).
    4. Faulty controller.

  • Problem: Microwave oven does not respond to START button.
    Possible causes:
    1. Defective START button.
    2. Faulty interlock switches.
    3. Door is not securely closed.
    4. Faulty controller.
    5. You waited too long - open and close door to wake it up!

  • Problem: No heat but otherwise normal operation.
    Possible causes:
    1. Blown fuse in HV transformer primary circuit or HV fuse (if used).
    2. Bad connections (particularly to magnetron filament).
    3. Open thermal protector or thermal fuse.
    4. Open HV capacitor, HV diode, HV transformer, or magnetron filament.
    5. Shorted HV diode, HV capacitor (will blow a fuse), or magnetron.
    6. Defective HV relay (not commonly used).

  • Problem: Timer and light work but no heat, cooling fan, or turntable rotation.
    Possible causes:
    1. Defective (lower) door interlock switch or door not closing fully.
    2. Faulty relay or triac.

  • Problem: Fuse blows when closing or opening door:
    Possible causes:
    1. Defective door interlock switch(s).
    2. Interlock switch knocked out of position.
    3. Misaligned door.

  • Problem: Loud hum and/or burning smell when attempting to cook.
    Possible causes:
    1. Shorted HV diode, magnetron.
    2. Burnt carbonized food in or above oven chamber.
    3. Shorted winding in HV transformer.
    4. Frayed insulation on HV wiring.

  • Problem: Arcing in or above oven chamber.
    Possible causes:
    1. Burnt carbonized food deposits.
    2. Exposed sharp metal edges.

  • Problem: Fuse blows when initiating cook cycle.
    Possible causes:
    1. Defective interlock switches or misaligned door.
    2. Shorted HV capacitor.
    3. Shorted HV diode.
    4. Shorted magnetron (probably won't blow main fuse but HV fuse if used).
    5. Defective triac.
    6. Old age or power surges.
    7. Defective HV transformer.
    8. Short in wiring due to vibration or poor manufacturing.

  • Problem: Fuse blows when microwave shuts off (during or at end of cook cycle).
    Possible causes:
    1. Defective triac (doesn't turn off properly).
    2. Defective relay.
    3. Shorting wires.

  • Problem: Oven heats on high setting regardless of power setting.
    Possible causes:
    1. Faulty primary relay or triac or HV relay (not commonly used).
    2. Faulty controller.

  • Problem: Oven immediately starts to cook when door is closed.
    Possible causes:
    1. Shorted relay or triac.
    2. Faulty controller.

  • Problem: Oven heats but power seems low or erratic.
    Possible causes:
    1. Low line voltage.
    2. Magnetron with low emission.
    3. Faulty controller or set for wrong mode.
    4. Stirrer (or turntable) not working.
    5. Intermittent connections to magnetron filament or elsewhere.
    6. Faulty primary relay or triac or HV relay (not commonly used).

  • Problem: Oven heats but shuts off randomly.
    Possible causes:
    1. Overheating due to blocked air vents or inoperative cooling fan.
    2. Overheating due to bad magnetron.
    3. Bad connections in controller or microwave generator.
    4. Faulty interlock switch or marginal door alignment.
    5. Faulty controller.
    6. Overheating due to extremely high line voltage.
    7. Stuck stirrer fan resulting hot spots detected by sensors.

  • Problem: Oven makes (possibly erratic) buzzing noise when heating.
    Possible causes:
    1. Fan blades hitting support or shroud.
    2. Vibrating sheet metal.
    3. Vibrating transformer laminations.
    4. Turntable or stirrer hitting some debris.

  • Problem: Oven light does not work.
    Possible causes:
    1. Burnt out bulb :-).
    2. Bad connections.

  • Problem: Fans or turntables that do not work.
    Possible causes:
    1. Gummed up lubrication or bad motor bearing(s).
    2. Loose or broken belt.
    3. Bad motor.
    4. Bad thermostat.
    5. Bad connections.
Read full tip
on Mar 30, 2008 • Kenmore 80412 Microwave Oven
0helpful
1answer

I have a model #401-80089700. The inside wall next to the controls will get hot and the microwave will shut off. after it cools, the display comes back on and it will work until it get hot again. It
all units have a thermal fuse that stops operation when case over heats . try replacing the thermal fuse could be out of tolerance.. looking for an obstruction in the high voltage radiation ducting that could be obstructing the flow of high voltage radiation , or the defuser belt or motor is no good or slipping, also the cooling fan obstructed or failed. .. all above to be handled by a master or journey man teck. or tv repairman. A professional not an novice.
Read full answer
Jan 21, 2015 • In Microwave Ovens
0helpful
1answer

My hb-p100n30al-s3 just shut off, screen went blank, un plugged it, plugged it back an 1:01 popped up on the screen. is it safe?
this is the 24 hr clock display
Read full answer
Mar 24, 2014 • Hamilton Beach Hbp100n30als3 1. Cf...
0helpful
2answers

Display blank, power source OK.
A thermal switch probably sensed the temp as too high and opened. If it did not reset when cooled down then the thermal switch is of the type that required replacement. Take it to a repair shop unless you are capable of making electrical checks and doing this safely.
Read full answer
Jan 02, 2014 • Maytag MMV5207 Microwave Oven
0helpful
1answer

Panasonic microwave NN-T543W
The thermal fuse that protects the magnetron is defective or the magnetron is getting to hot causing it to shut down, if the fan is not running cools the magnetron it will shut off.
Read full answer
Mar 15, 2012 • Panasonic NNSD967S Microwave Ovens
1helpful
2answers

Spacemaker (JVM1640SJ) Microwave Oven: my microwave keeps shutting off...
Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101
n
Read full answer
May 17, 2010 • GE Spacemaker JVM1640SJ Microwave Oven
0helpful
2answers

Microwave shut off
try to checked the fuse if its blown.and replace a new one,check also the power cord.
Read full answer
Jul 05, 2009 • General Electric Microwave Oven
2helpful
2answers

Oven shuts down after a few seconds into cycle time for cooking
The magnatron (heating element) is located in the cavity behind the control. If it's leaking microwaves onto the electronics, this will occur. This means the Mag should be replaced and a radiation test run on unit.
Read full answer
Mar 15, 2009 • GE Spacemaker JVM1640SJ Microwave Oven
0helpful
1answer

My microwave heats but shuts off due to the fan not coming on
A little late for a reply; you probably have replaced it by now.

I suspect it shuts down because the fan is no longer turning on and there is probably a thermal shutoff switch near or on the magnetron to prevent the chance of fire.
Read full answer
Jan 08, 2008 • GE JVM1190 Microwave Oven
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