Question about Amana HDC21 Microwave Oven

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Blown fuses We have had two Amana HDC21's have the internal fuses blown. We have another HCD21 that sits next to it, and it is fine so far. They are not on the same breaker. We have had the voltage checked on both units, and they check out okay per our electrician. Do you know what would cause this sort of anomoly?

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  • 9,030 Answers

I service a lot of commercial units.

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.

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 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 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 when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

There should also be a "mini-manual" hidden inside the unit behind the control panel, which is very helpful when troubleshooting.

Please feel free to contact me directly if you need more help. If you can scan and e-mail the mini-manual, that would help me help you, too.

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

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

Posted on Apr 23, 2008

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Call Amana tech support @ 866.426.2621

Nov 15, 2013 | Amana HDC21 Microwave Oven

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The fuse to the Power cord on our amana hdc21 blows when you start cooking a product why?


How many other electrical items do you have working on this same fuse? Lamps, radios, tv's, fans, air conditioners, refrigerators, etc. can all put stress on the circuit causing the fuse to blow. Check the fuse to see what else it controls. You may have to move your microwave to another outlet...2100 watts is very powerful and draws a great deal of electricity. Or you may just have to turn off a lamp, tv, radio, etc when using your microwave.

Nov 04, 2010 | Amana HDC21 Microwave Oven

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Nothing works at all. It's plugged in and the breaker is fine.


There is usually a 125V, 20 AMP line fuse inside the microwave, mounted at the point where the power cord enters the back of the unit. Unfortunately, you will need to uninstall the oven (if this is an over the range model), UNPLUG it and remove the exterior case to access. The case comes off in various ways depending on manufacture and model. If the model number you listed this question under is correct, you have THREE potential causes for a complete loss of power. 1. Line fuse 2. Line filter/noise filter circuit board 3. Thermal Cut-Out (Thermostat) for the Magnetron. The line fuse is connected in line with the power cord inside the unit and is listed as part of item 11 under the "Blower-Motor" parts heading. The line filter printed circuitboard is listed as item 19 (part number: R9800472) under the "Blower-Motor" heading. The Thermostat for the Magnetron is listed as item 8 (W10254040) under the "Cavity" parts heading. The most expensive part is the line filter board, which runs about $25.

I would recommend you check the fuse, first. This the easiest and least expensive repair. It is also the most common. If you managed to overheat the oven any time recently, you may want to check the thermostat to see if it is still good, next. It should read 0 ohms when measured out of the circuit across the terminals.

If the line fuse is blown, you can usually purchase a box of fuses at a hardware store for just a little more than what the manufacturer charges for a single fuse. 125V, 20AMP Ceramic Slow Blow fuses are recommended.

If you have any questions, or need additional assistance troubleshooting, please post back and let me know. I hope you find this information helpful.

NOTE: Make sure you take any resistance readings with the microwave UNPLUGGED and the component under test isolated (removed) from the circuit. These ovens can blow a fuse by simply sitting idle. This can occur from any power fluctuations, brown outs, voltage spikes, etc. Or, it could be the symptom of a component that may have failed. If you find the internal fuse blown and replace it, only to have it blow again, you have a more significant problem than a simple blown fuse.

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My microwave oven keeps tripping the circuit breaker.i replaced the outlet that it plugs into but it still trips it. is there an internal fuse in the oven that may be bad?


If a fuse inside had blown, that would definitely reduce the current flow rather than trip the breaker.
I have replaced several breakers over the years; they no longer last forever.
Try your Amana on a different circuit, not in the kitchen; if that other circuit likes the oven, the breaker is bad. If the alternate circuit breaker also trips, then you have not a blown fuse in the Amana but rather a shorted component inside and repairing the oven will likely cost about the same as replacing it.

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GETTING F-3 ERROR


We would need your brand and full model number from the tag in or on the unit.

NOTE:
The FixYa system is not currently notifying me when folks reply to my posts, so please contact me directly for FREE help & do-it-yourself advice.

William E. Miller - prototech@usa.net - http://www.microwavedisplay.com

Sep 15, 2009 | Amana HDC21 Microwave Oven

1 Answer

Fuseholder melted overdrawing amps and not heating amana hcd18sd


FUSEHOLDERS MELT ON MICROWAVES ALL THE TIME its the most common thing that makes the microwave die 99.9% of the time its nothing , something to do with the metal that is usedin the fuseholder , and the fuse .with a long run of the oven the fuse gets hot and the fuse melts inside . sometimes you can get away with a little contact cleaner on the holder and a new fuse . other times you will need a new fuseholder too. good luck

Jan 22, 2009 | Amana HDC21 Microwave Oven

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Amana cmax microwave


Test the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.

The diode and capacitors can br tested. The capacitor must be alloweddischarge before testing, or you risk to get electrocuted, even ifpower is off. Capacitors can get discharged by shorting their twocontacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts. (here in UK).

Nov 29, 2008 | Amana HDC21 Microwave Oven

3 Answers

Possible fuse -- no power


Replacing a fuse Locate your fuse. Most microwave fuses look like the one pictured to the left. They are usually an inch or two long. Each end is metallic and the center is either ceramic or glass.
To get to the fuse, remove the outer cabinet of the unit, which is usually held in place with a few screws. Once the outer cabinet is removed, follow the power cord into the unit. It will take you to the fuse holder, where the fuse sits. The fuse holder is located two or three inches into the unit, and may be attached to a power board.
Decide if your fuse is blown. A blown glass fuse will produce flash burn marks on nearby surfaces, or it will be completely black on the inside. The internal fuse wire (filament) will be melted and blackened. Ceramic fuses give no outward signs of having blown. To determine if a ceramic fuse is blown, test it with an ohmmeter. If the ohmmeter reads zero ohms, your fuse is fine. A reading of infinite ohms means your fuse is blown.
Replace the blown fuse. Pop it out of its holder and snap in a new one. You can squeeze the fuse clips together with your fingers in order to tighten their grip. Replace the unit's outer cabinet, plug it back in, and test to see if it is running properly. DO NOT run the microwave with nothing in it.
NOTE: Fuses do not usually blow on their own. A fuse may blow because of problems with the interlock switches or with high voltage circuitry. It is also possible, though rare, that a power surge will cause a fuse to blow.

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