Question about GE JVM1870 Microwave Oven

2 Answers

My GE Built-in microwave model JVM1870 appears to have died

Two weeks ago I went to use my microwave, however as I closed the door a flash of light appeared and the microwave went dead, with no signs of life. I replaced the fuse and still nothing, does anyone have any suggestions?

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  • mtarking Dec 17, 2008

    Thanks for getting back to me. As of now there isn't anything on. No lights, fan, display. It would seem as if a fuse blew, however i don't know if the microwave has a internal fuse. i have already checked the outlet that the microwave is using with another appliance and it works fine.

  • mtarking Dec 17, 2008

    As of now I have no power at all

  • William Miller
    William Miller May 11, 2010

    Have you had any trouble with the cooktop lights or the vent hood exhaust fan?

    Since it occurred when you closed the door, I would a suspect door switch or switch mount issue.

    But I;'ll wait for your clarification before I offer a full solution.

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A microwave can be dead for many reasons.

It may be the fuse, which is usually located behind the grille, on the floor of the oven behind the control panel, between the door switches, or on the filter board near where the cord comes into the unit.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

When checking TCOs or thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

If the cavity thermostat needs to be checked or replaced you'll need to pull the oven from the wall.

You can download GE owner's manuals and installation instructions here to make that easier.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

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.

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

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

Posted on Dec 17, 2008

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How do i get to the fuse in ge model jvm 1870

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Posted on Jan 11, 2009

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That's covered on pages 35 & 36 of the owner's manual here.

Cooktop Light/Night Light

On models JVM1850, JNM1851, DVM1850 and
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On models JVM1870, JVM1871, JVM2050 and
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To replace the bulb(s), first disconnect the
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Remove the screw at the left edge of the light
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Be sure the bulb(s) to be replaced are cool
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Replace with the same size and type bulb.

Raise the light shield and replace the screw.
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Oven Light

Replace the burned-out bulb with a 120 volt, 20-watt
halogen bulb (WB36X10213), available from your
GE supplier.

To replace the oven light, first disconnect the
power at the main fuse or circuit breaker panel
or pull the plug.

Remove the top grille by taking out the screws
on top of the grille that hold it in place and
sliding the grille to the left (opening the door
makes grille removal easier).

Next, remove the light cover.

On some models, the light cover is located
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screw that secures the light cover and lift the
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On some models, the light cover is located at the
left of the top opening. Lift the cover off.

Pinch the clips that hold the light socket in
place and lift the socket out.

Remove the bulb from the light socket by
pulling straight out. Replace with the same size
and type bulb, then replace the light socket and
cover.

Replace the grille and screws. Connect electrical
power to the oven.

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

* If your control board was damaged (lights won't come on, won't go off, fan or turntable not working right) after a cooktop light bulb blew or was inserted or removed while power was on, see here.

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Please check your door safety interlock switch, the #1 reason microwave ovesn do not heat. Find these tiny switches inside opposite the hinge.

When the contacts burn, the oven no longer can tell if the door is closed.

Thanks for using fixya.com

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You`ll probably find that it`s the interlock switch on the door latch. When the door is closed, the hooks that protrude from the door enter the slots in the oven casing and press down on the latch switches. DO NOT over ride these switches, replace them or get an engineer in to check them. Ian

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Have an installed GE Microwave jvm1870 with a burned out oven bulb. Have replacement bulb but can not see how to get to the old bulb to replace it.


From the owner's manual:

Cooktop Light/Night Light

On models JVM1850, JNM1851, DVM1850 and EMO4000, replace the burned-out bulb with a 120 volt, 40-watt incandescent bulb (WB36X10003), available from your GE supplier.

On models JVM1870, JVM1871, JVM2050 and JVM3670, replace the burned-out bulb with a 120 volt,
20-watt halogen bulb (WB36X10213), available from your GE supplier.

To replace the bulb(s), first disconnect the power at the main fuse or circuit breaker panel or pull the plug.

Remove the screw at the left edge of the light cover and push on the right edge of the cover to open.

Be sure the bulb(s) to be replaced are cool before removing.

After breaking the adhesive seal, remove the bulb by either gently turning (for models JVM1850, JNM1851, DVM1850 and EMO4000) or pulling straight out (for models JVM1870, JVM1871, JVM2050 and JVM3670).

Replace with the same size and type bulb.

Raise the light shield and replace the screw.

Connect electrical power to the oven.

Oven Light

Replace the burned-out bulb with a 120 volt, 20-watt halogen bulb (WB36X10213), available from your
GE supplier.

To replace the oven light, first disconnect the power at the main fuse or circuit breaker panel or pull the plug.

Remove the top grille by taking out the screws on top of the grille that hold it in place and sliding the grille to the left (opening the door makes grille removal easier).

Next, remove the light cover.

On some models, the light cover is located in the center of the top opening.

Remove the screw that secures the light cover and lift the cover off.

On some models, the light cover is located at the left of the top opening.

Lift the cover off.

Pinch the clips that hold the light socket in place and lift the socket out.

Remove the bulb from the light socket by pulling straight out.

Replace with the same size and type bulb, then replace the light socket and cover.

Replace the grille and screws.

Connect electrical power to the oven.

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

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BLEW A FUSE ?


We see (and repair) this a lot. The problem is on the control panel, which we regularly repair nationwide by mail for $39.95 postpaid in about a week.

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.

This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.

This can often also affect the exhaust fan operation, too. The lights and fan can be inoperable or stuck on too.

Details of our service and critical safety information and disassembly information is at our site.

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

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1 Answer

Microwave appears to run all the time


This is probably a bad primary interlock switch (bottom door switch) but there is a chance it's a bad relay or connection on the control board.

If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa:.

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

There also should 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.

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.

Door switch or mount trouble is usually caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

If you only need a switch, you can order a universal type here for $5 postpaid.

If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases.

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

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