Question about GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Fan problem while cooking after 10 min fan starts working and keeps blowing for quite some time. Seems like it's trying to cool overheated oven (microwave), but it isn't hot. This wasn't happening before. I suspect that some kind of sensor is at fault. Any suggestions are greatly appreciated. We have GE Profile Spacemaker oven which is 3 years old.

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  • GE Master
  • 9,030 Answers

So is it cooking okay?

I would guess that your hood thermostat is failing.

The hood thermostat's job is to turn on the exhaust / vent / hood fan whenever the temperature above the cooktop gets too high.

A thermostat can only trip so many times before it starts to fail. Then it may come on by itself from time to time then finally stay on permanently.

If you or someone you know wants to look into this, we have critical safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa.

We even have a video on our site that shows you how to safely & easily remove the control panel assembly in less than 5 minutes so you can check out your oven.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

We're happy to help you and we'd appreciate your thoughtful rating of our answer.

Posted on Jul 19, 2008

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Exterior of oven , top and both sides gets very hot to touch, when cooking +- 10 minutes or more the last couple of days; no Error ( E41/42/45 or 47 are being displayed. Fan is normal, functions: OK


There could be food or oil buildup around the door frame which will absorb some of the radiant and microwave energy whilst cooking. Give it all a good clean and see if that helps. If everything else is working properly, it may be a problem with the cooling fan. Microwave ovens have a "stirrer fan" inside the roof or rear of the cooking area to disperse the microwaves and some convection / microwave ovens also have a cooling fan which assists in dissipating heat within the cabinet.

Jan 04, 2016 | Microwave Ovens

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.

on Mar 30, 2008 | Kenmore 80412 Microwave Oven

1 Answer

Where is the thermostat located and what does it look like? How do you check it out? Trying to figure out if I have a thermostat or magnetron problem.


most likely it doesn't have. operation is time controlled (per your setting, in sec or min.) typically it has a or more than one thermal cutout/s (you can call it thermostat too, depending on how you define it) which will temporarily opens the circuit to prevent overheating then should re-set (turn on again) if not defective.

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Oct 13, 2015 | In Microwave Ovens

2 Answers

We have just purchased a Kenwood microwave/combination oven and are concerned there may be a problem. When the food has finished cooking and the microwave beeps it seems there is a fan or something still...


In most modern combination microwave ovens, if not all, there is a fan that comes on after use to cool the magnetron and cavity down. This is quite normal but if you still have doubts, contact Kenwood's web site and send them a question.
Hope this halps to put your mind at rest.

Nov 27, 2010 | Microwave Ovens

1 Answer

I PUT A POTATO IN FOR 6 MIN. AND AFTER ABOUT 2 MIN. IT SHUTS DOWN AND A MIN OR SO LATER IT STARTS UP AGAIN ,BUT THE TIME STILL COUNTS DOWN AND THE TURNTABLE IS STILL TURNING, AND YESTERDAY I HAD TO UNPLUG...


it sounds like it is overheating. but if only stops for a minute or so dont know if that would be enough time to cool off.When you start it up can you hear the fan running? does it keep running when it shuts down? if it's not running then thats the problem If the fan is running and shuts down when it shuts down then try shaking the door when you start it up the next time or you can try it the first time just to eliminate it being a faulty interlock switch. let me know about what you find about these two ideas.

Sep 02, 2009 | Sanyo Microwave Ovens

1 Answer

Fan keeps running


Neither the owner's manual nor the quick start guide for this model addresses that specifically, but most commercial microwaves do work this way to ensure proper cooling.

The manual does state that when you open the door then close it, the light and fan will stay on for an unspecified period of time.

If the word "HOT" appears in the display, the magnetron is overheated and the fan will run until the temperature is brought down.

If the fan fan NEVER shuts off, then there may be a stuck relay or defective sensor.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Nov 06, 2008 | Microwave Ovens

1 Answer

Auto-fan turns on too often.


Normally the exhaust / vent / hood fan will come on automatically if the stove top or the bottom plate of the microwave gets too hot.

Also, there may be some settings for the auto-fan that can work like this.

Consult your manual. If you don't have it, you can download GE owner's manuals and installation instructions here.

Otherwise, the hood fan thermostat may be failing. It should be normally open when you do a continuity check.

If you or someone you know wants to look into this, we have critical safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa.

We even have a video on our site that shows you how to safely & easily remove the control panel assembly in less than 5 minutes so you can check out your oven.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

We're happy to help you and we'd appreciate your thoughtful rating of our answer.

Jul 16, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Ge micro wave mdljvm


Your magnetron is overheating, causing the magnetron thermostat to open, which kills all power to the oven until it cools back down.

Is the internal cooling fan running when you cook? Are all the air vents clear? If not, the magnetron can be destroyed.

If you or someone you know wants to look into this, we have critical safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

We're happy to help and we appreciate your thoughtful rating of our answer.

Jul 02, 2008 | GE Microwave Ovens

2 Answers

GE Profile Spacemaker keeps asking for time date reset and will not operate


The power to the unit is drooping (when the heavy microwave load kicks in) causing the reset.
Try plugging it into a different outlet (whole different circuit if possible) and if that works then you have a wiring problem to the original outlet.

Jan 23, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

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