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The heat is on and off and the fan speed changes

The fan speed changes according to the sound. The heat seems to waiver sometimes on then off.

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Check to see if the Voltage Regulator has not openned or shorted on the main pc board.
This is a Voltage Regulator Problem!

Robert!

Posted on Oct 02, 2009

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Posted on Jan 02, 2017

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1 Answer

My Whirlpool microwave randomly makes a growling noise (with vibration) when not in use. It seems to be coming from the top above the fan area. Something going out?


sometimes a bad relay on the main timer board will tell the unit to heat with nothing in it and it will arc in the wave guide or antenna area. Arcing sounds like growling or grumbling. "Random" may be from the relay sticking sometimes and then sometimes not. Will destroy the wave guide and the magnetron and the unit could not be repaired. Would have to be replaced if that happens

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Fan works when component heat is higher so its normal.

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My microwave oven siows down and then speeds up.


Is it still heating food properly? You can perform a basic test with a microwave safe mug or plastic cup of water. It should be boiling or too hot to touch within 1 to 2 minutes. Be careful not to overheat the cup if plastic and use extreme caution when touching or removing it from the microwave.

If it is not heating properly then the magnetron may be faulty and unit should be replaced.

Can you tell what specifically is speeding and slowing? Is it the turntable or the humming sound of the unit itself? Many microwaves vary their intensity in order to heat/cook evenly and that will vary the pitch of the sound you hear and sound like it is speeding up or slowing down. If the turntable is slowing and speeding up then there may be a bad motor and the unit should probably be replaced.

If the unit is heating adequately and the turntable speed is uniform then what you may be hearing is simple power cycling and/or fan noise.

Only trained and certified technicians should attempt repair of microwaves due to the hazards of high voltage and microwave radiation leakage if parts are not replaced properly. Although you can have a microwave repaired the cost may be equal to, or higher than, the cost of an equivalent new unit for a 900w microwave.

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1 Answer

GE JVM1430 over the range microwave/exhaust fan unit. The exhaust fan (not the microwave cooling fan) all of a sudden has its speed slowed down considerably. The unit vents out the back, not top. ...


Sounds like a strip down of the fan and lubricate the bearings with sewing machine or thin cycle oil will do the trick.
Hope that helps.

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Whirlpool MH3184XP Microwave Turns On, Heats, but sounds like fans not working. 4 years old, fans worked fine until they seem not as loud anymore. The magnetron is working fine as it heats (did the 1 cup...


Suggest you pull the plug out, remove outer cover and place a cup of water into the micro. Set power to minimum then switch on and take note if the fan works or not. If not, switch off immediately and have it replaced(magnatron will burn out if left to run without fan.)

Sep 18, 2010 | Whirlpool MH3184XP Microwave Oven

1 Answer

My GE spacemaker microwave won't heat. Everything else seems to work. Model JVM1851BH06


Does the magnetron come on when you hit your settings to cook/warm/etc? You'll know that unmistakeable sound of a whirring/blowing fan and a "hum". Plus when the magnetron cycles on and off, you'll notice the light inside the microwave dim and get brighter in accordance with the cycling.
IF the magnetron's not coming on then you're looking at servicing it. If you're electrically inclined, there's a relay and a really big diode that is in the circuit with the magnetron. A meter will tell you if the diode's open (if you can get to it - sometimes manufacturers will epoxy over the connections to keep you out and make you gop to them for service).

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Kenmore Microwave Oven model #401.80082700


Sounds like a bearing is tightening up when it get heated up with use. Then after a cool down period it works normally until using it heats it up again. Eric

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Probally the belt is broken on fan up at the top.

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Microwave will not heat


Q - The microwave makes a loud "hum or buzz" noise but will not heat up the food?
A - 9 times out of 10 this is usually this is a bad magnetron, the other time is sometimes a bad high voltage diode. See components section.
Q - My microwave is running and sounds like it is working but will not heat up anything.
A - Many thing can do this but, common things are....loose high voltage wire.....poor solder joint on board.....magnetron.....power relay.....
 Q - The microwave display counts down and the inside light is on,  but nothing is heating and the fan is not running.
A - This most commonly is a bad door switch, other possible problems are a faulty relay or solder joint on the power module, but a bad door switch is most common.
Q - The fan in my microwave oven is not running will this hurt my microwave?
A - YES, the fan cools the magnetron and electronics, take the microwave in for service, most fans are not too expensive to replace.
Q - My microwave blows the fuse inside itself as soon as I push the start button.
A - Usually a shorted high voltage capacitor...see components section.



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1 Answer

Samsung SMH7178STD microwave fan stopped working


It looks like the part of your computer board on microwave which responsible for controlling light and fan stop working. In this case you have to replace computer board.

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