Question about Amana RFS12MPS Microwave Oven

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Amana microwave M#rcs10mpsa that had a loud hum that sounds like it was coming from the transformer or capacitor and then it blows the two control fuses. i replaced the magnatron but it is doing the same thing. How do you check the capacitor or diode

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  • Contributor
  • 75 Answers

You need a meter than has the ability to check capacitors. These meters are generally more expensive like 150 bucks and mostly sold for HVAC techs. You disconnect all wires to the cap and connect your test leads. The hum is usually the transformer getting ready to die. Just keep using it until so. The transformer will run you about 130 bucks I think.

Posted on Jul 18, 2013

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Posted on Jan 02, 2017

MicrowaveSvc
  • 9047 Answers

SOURCE: Whirlpool Microwave

I would suspect the high-voltage transformer in this case, but the capacitor may be failing.

The high voltage section uses and generates voltages that can be instantly lethal.

So I don't recommend that anyone work in this area unless he has either a lot of experience or at the minimum, a good understanding of the safety issues and procedures involved.

If you or a friend decide to work on it, 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

Also, there should also be a very helpful "mini-manual" hidden inside the unit behind the control panel. It's very helpful when troubleshooting.

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

Here are some links you or a friend can use for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/cap_test.html
http://www.gallawa.com/microtech/diode.html
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html

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

Posted on Feb 03, 2008

  • 19 Answers

SOURCE: Ge Spacemaker microwave jvm240 wv Micro hood combo.

sounds to me like the magnatron has shorted out. i don't know of a way to test them unless you have some high dollar equipment. a continuity test prob wont tell you anything. what reading did you get on the cap when you tested it?

Posted on Jan 06, 2008

SOURCE: Ge jvm1650wb005

weve had our fixed before and it's the heating element $75-$100 to fix.

Posted on Sep 01, 2008

tiway1
  • 100 Answers

SOURCE: Makes a loud humming sound and blows fuse behind controll panel

Most likely a shorted capacitor is causing the fuse to blow. Easy and cheap to fix.
Check with www.martinmicrowave.com or call toll free 1-877-894-0035 for parts info

Posted on Sep 06, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: Kenmore microwave making loud buzzing sound.


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


Posted on Mar 06, 2009

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1 Answer

I have a model aco1860 it made loud hum then went dead


Sounds like the cook capacitor has shorted. This is a common thing with some microwaves. There is also a protection diode across the capacitor, which might have shorted instead, it's there to protect the capacitor from voltage spikes. Best place to get parts is WES Components at Ashfield in Sydney, depending where you live.

Feb 24, 2015 | Amana Microwave Ovens

Tip

Micorwave ovens - and where's the heat?


A microwave not heating up is caused by one or more of the following -

1) Failed controller board (unlikely if you are getting a clock readout and you can get the various functions to work, just no heat)
2) Failed door switch
3) Failed thermal fuse, when used
4) Blown power fuse that is dedicated to the microwave circuit
5) Bad diode
6) Bad capacitor
7) Bad magnetron
8) Bad transformer

Door switches insure the microwave circuit will not engage when the door is open. Slamming the door of the microwave is hard on the switch.

The thermal due is wired into the microwave harness, and is a melting allow type, based on heat buildup within the oven. Always replace with a fuse of the same thermal rating.

The power fuse is a special type and should only be replaced with that same type and rating. It is easily tested.

The diode is a relatively inexpensive part, and is not easily tested. If a grumble is heard coming from electrical area of the unit, then the diode could be shorted.

A shorted capacitor will blow the fuse immediately. And open capacitor will cause a "no heat" condition.

A bad magnetron will also cause a low level hum or grumble from the transformer. But is may also cause no other identifiable symptom of failure.

A bad transformer will exhibit a grumble or hum, and may or may not blow the fuse. But be careful here, the secondary of the transformer produces very high voltages, up to 2.5Kv. Few people own a meter capable of measuring such voltages.

Service and repair of microwave ovens is dangerous work. If you don't know what your doing, DO NOT ATTEMPT TO SERVICE A UNIT WITHOUT INSTRUCTION.

on Feb 04, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

My JES636WK01 microwave heats up but it makes a loud humming noise. I suspected the Magnetron and disconnected it. The microwave was then operated and the n oiuse was the same. Do you have any ideas


Disconnect the HV transformer leads from the magnetron and the capacitor. Make sure none of the wires are touching the chasis or other parts. If the loud humming sound is still present, it is the High Voltage transformer making the noise. If the noise goes away, it is the High Voltage Capacitor going bad.

*MAKE SURE TO UNPLUG UNIT BEFORE TOUCHING ANY OF THE HIGH VOLTAGE LEADS! ALSO, DISCHARGE THE CAPACITOR BY SHORTING THE TWO SIDES AGAINST EACH OTHER!

Apr 15, 2011 | General Electric Microwave Oven

1 Answer

Turns on but no heat. ? is there a fuse we can replace and where is it?


A microwave not heating up is caused by one or more of the following -

1) Failed controller board (unlikely if you are getting a clock readout and you can get the various functions to work, just no heat)
2) Failed door switch
3) Failed thermal fuse, when used
4) Blown power fuse that is dedicated to the microwave circuit
5) Bad diode
6) Bad capacitor
7) Bad magnetron
8) Bad transformer

Door switches insure the microwave circuit will not engage when the door is open. Slamming the door of the microwave is hard on the switch.

The thermal due is wired into the microwave harness, and is a melting allow type, based on heat buildup within the oven. Always replace with a fuse of the same thermal rating.

The power fuse is a special type and should only be replaced with that same type and rating. It is easily tested.

The diode is a relatively inexpensive part, and is not easily tested. If a grumble is heard coming from electrical area of the unit, then the diode could be shorted.

A shorted capacitor will blow the fuse immediately. And open capacitor will cause a "no heat" condition.

A bad magnetron will also cause a low level hum or grumble from the transformer. But is may also cause no other identifiable symptom of failure.

A bad transformer will exhibit a grumble or hum, and may or may not blow the fuse. But be careful here, the secondary of the transformer produces very high voltages, up to 2.5Kv. Few people own a meter capable of measuring such voltages.

Service and repair of microwave ovens is dangerous work. If you don't know what your doing, DO NOT ATTEMPT TO SERVICE A UNIT WITHOUT INSTRUCTION

Jan 16, 2011 | GE JVM3670 Microwave Oven

1 Answer

It made a loud pop while heating. Now everything works but the microwave does not heat. What is wrong and how can it be fixed?


A microwave not heating up is caused by one or more of the following -

1) Failed controller board (unlikely if you are getting a clock readout and you can get the various functions to work, just no heat)
2) Failed door switch
3) Failed thermal fuse, when used
4) Blown power fuse that is dedicated to the microwave circuit
5) Bad diode
6) Bad capacitor
7) Bad magnetron
8) Bad transformer

Door switches insure the microwave circuit will not engage when the door is open. Slamming the door of the microwave is hard on the switch.

The thermal due is wired into the microwave harness, and is a melting allow type, based on heat buildup within the oven. Always replace with a fuse of the same thermal rating.

The power fuse is a special type and should only be replaced with that same type and rating. It is easily tested.

The diode is a relatively inexpensive part, and is not easily tested. If a grumble is heard coming from electrical area of the unit, then the diode could be shorted.

A shorted capacitor will blow the fuse immediately. And open capacitor will cause a "no heat" condition.

A bad magnetron will also cause a low level hum or grumble from the transformer. But is may also cause no other identifiable symptom of failure.

A bad transformer will exhibit a grumble or hum, and may or may not blow the fuse. But be careful here, the secondary of the transformer produces very high voltages, up to 2.5Kv. Few people own a meter capable of measuring such voltages.

Service and repair of microwave ovens is dangerous work. If you don't know what your doing, DO NOT ATTEMPT TO SERVICE A UNIT WITHOUT INSTRUCTION

Jan 16, 2011 | GE Spacemaker JVM1640SJ Microwave Oven

2 Answers

Not working plmv169dc


HI, the sound you herd was the noise filter and running diode. these important components have failed at this point. you will need to replace these components asap, if possible. this will fix your issue.

The Magnetron Cut-off fuse will need to be replace as well. this will blow if there is a malfunction within the unit.

Jul 22, 2009 | Frigidaire PLMV169DC Microwave Oven

1 Answer

Makes a loud humming sound and blows fuse behind controll panel


Most likely a shorted capacitor is causing the fuse to blow. Easy and cheap to fix.
Check with www.martinmicrowave.com or call toll free 1-877-894-0035 for parts info

Sep 02, 2008 | Sharp R-1460 Microwave Oven

1 Answer

Loud humming


Ouch. Magnetron check performed with multi meter.


1) Disconnect power to unit
2)Allow to stand for minimum 5minutes
3)Remove cover
4)Find large insulted screwdriver
5)short terminals of capacitor to dissapate charge. (If no pop or crackle its possbly already bled through resistor.

Right. Magnetron check both terminals for short to casing if shorted, replace. Check reading between terminals low resistance or direct short is not a problem. Open circuit, replace.

For non heating, this is usually barrel fuse, typically HV 5Kv or more, faults in an overcurrent situation.

Check the capacitor for shorts to casing, a short will indicate a failure. Check the diode in the capactior if fitted by reverese continuity check accross the terminals. MUST DISCHARGE FIRST, else you'll blow the meter up and likely recieve a SEVERE burn.

The most common cause would have to be a problem with the capacitor next the transformer for loud humming. Three basic checks for the transformer.

Probe the low voltage side first, open circuit? replace. a low reading is normal, high voltage side is a two part process, take a reading between the two terminals one goes to the magnetron the second to the capacitor directly. this should be approx the same reading as the LV coil. The last and most important coil is to check the coil side ofthe barrel fuse to ground, this will measure between 80 - 150 on a digital meter, around 90 to 100 for a 900w is in the normal range.

Loud humming is created primarily by having a working transformer with no wher to send the voltage out.

It will only be one or more of these three items, which will cause this, the rest is safety and control gear.


Jun 14, 2008 | GE JVM1630 Microwave Oven

1 Answer

Dead replaced fuse now makes loud noise


Yes that noise is causing your fuse to blow. Machine gun sound sounds like the High Voltage Capacitor or High voltage diode is bad. (Loud humming sound is usually a bad magnetron or bad power transformer). Most of these parts are inexpensive, except for the magnetron. But most of the repair bill is most likely going to be for labor.

Based on your model, it looks like an over the range microwave. And to fix any of these problems require the removal of the microwave from the wall. So its up to you if you want to deal with that hassle. But you also have to consider that you'll probably have a hard time trying to find a new microwave that will fit.

Mar 25, 2008 | Sharp R-1480 Microwave Oven

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