Question about Dacor DMT2420SS Microwave Oven

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Dacor DMT2420s when started makes a loud buzzing sound

Everything was working fine until a few hours ago (light, door, buttons, turntable, door closes & opens etc..) was bought in 2005
now when the start button is pushed the units makes a VERY LOUD BUZZING SOUND & sort of VIBRATES
what can be done? what causes this? Everything else is fine.
Thank YOU!!

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The fan could have an obstuction. I have heard of tech sheets getting into the fan and causing a vibration and vibrating sound.

Posted on May 12, 2009

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Dacor DMT2420S


That would be your waveguide cover. If damaged or discolored, the waveguide cover has been damaged by heat and must be replaced.

It protects your waveguide and magnetron from arcing due to grease and food particles.

The area of the waveguide behind the waveguide cover should be clean, and if rust or flaking is present it must be sanded, then repainted with high temperature appliance paint.

For Dacor model DMT2420S, the waveguide is part number 66345 and you can get it from The Pros here for $11.07 (subject to change).

The service manual is at my site here: http://www.microwavecontrol.com/dmt_2420_sm.pdf and the part list is here: http://www.microwavecontrol.com/dmt_2420_parts_list.pdf.

Feel free to e-Mail me at pupista@gmail.com if you need more free advice.

Sep 25, 2016 | Dacor Microwave Ovens

1 Answer

We have a Dacor Microwave DMT2420S that everything works except the Touch Screen doesn't light up.


The display board is bad, it may be part of the control PCB or it may be separate. Some are back lit and some are lit internally.

Oct 21, 2013 | Dacor DMT2420S Preference 24" Microwave...

1 Answer

Dacor DMT2420. Light and Display work fine, and you can type in time for cooking, but when you hit start, it does not make the buzz of it's normal sound, and the turntable doesn't spin.


On the DMT2420, that's a bad bottom door switch, or possibly that switch's mount.
The service manual is here and the parts list is here.
You can order Dacor parts by part number from the Pros here.

Jul 22, 2011 | Dacor DMT2420 1200 Watts Microwave Oven

1 Answer

The Dacor DMT2420S microwave has power. Instrument dial is lite and the timer works. I can program the keypad however the turntable will not turn and the microwave will not work. The timer will count down...


There's no reset button, and if the fuse were blown, the oven would be totally dead.

Your problem is almost certainly a failed secondary interlock (bottom door switch) or its mount.

You can see our help file on door switches here and the service manual here.

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

Jun 20, 2011 | Dacor Microwave Ovens

1 Answer

Dacor DMT2420S Microwave has light and touch pad fully functional but when you push start, the clock counts down normally but no sound of the oven running nor does the turntable turn. Food does not heat....


Simple fix.

You need to replace the bottom door switch, or repair its loose or broken mount.

See this help file on door switches, and refer to the service manual here for disassembly help.

You can find part numbers here and order Dacor parts (by part number only) here.

If a switch is all you need, we offer a universal type for only $5 postpaid which you can order here.

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

Aug 22, 2010 | Dacor DMT2420SS Microwave Oven

1 Answer

Dacor DMT2420S Blank display, oven does not work


It sounds like you need to have the control panel assembly repaired or your CPU unit replaced and you need a new bottom door switch.

We regularly repair these control units for customers nationwide by mail for $39.95 postpaid in about a week or so with a one-year guarantee.

Or you can order our exclusive modified control unit with our proprietary upgrades for $115, then if you return your defective control unit in repairable, good cosmetic condition, we'll give you a core refund of $30. It comes with a one-year guarantee. See details here.

We have the service manual and have uploaded it our site here to help you. It covers disassembly.

Also see this file.

You can order a universal type switch here for $5 postpaid.

Feel free to contact me directly for more help and information.

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

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

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Feb 02, 2010 | Dacor DMT2420SS Microwave Oven

1 Answer

My Dacor DMT2420 fan, light and turtable motor run continuously when the door is open. I have unplugged the unit to reset it with no help, another on-line forum expert suggested checking the door switches...


If the cooling fan, light and turntable run continuously when the door is open, but not when it is closed, your secondary interlock (bottom door switch) is shorted (always on).

Even if it's shorted, the actuator button (usually red) will still move up and down when you open and close the door.

It will need a new door switch.

See the service manual here. See our file on door switches here.

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

Jan 04, 2010 | Dacor DMT2420SS Microwave Oven

1 Answer

Light and turntable stays on


Chances are you have a bad bottom door switch or a misaligned bottom door switch mount.

We have the service manual for this model and have uploaded it for you here. The separate parts list (if needed) is here.

Also see our file on door switches here.

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

If you need other parts, you can order them by part number here.

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

Dec 05, 2009 | Dacor Microwave Ovens

1 Answer

Dacor dcm24s.light, fan, and control panel work but turntable and heat do not


Most likely the bottom door switch. Dacor units are built by Sharp and that switch is a very common problem. You'd either need to check the switch with an ohm meter or remove the cover of the switch to see if it's burned inside.

Oct 20, 2008 | Sharp R-930AK Convection/Microwave Oven

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