Dacor DMT2420SS Microwave Oven Logo
Posted on Feb 02, 2010
Answered by a Fixya Expert

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Dacor DMT2420S Blank display, oven does not work

The model is a Dacor DMT2420S. The problem started as the display being scrambled. Turning power on and of accasionally would fix the problem. It then became permanent. At this point the oven was still usable. The display eventually went blank. Backlit was working. Touch screen still responding and oven still working. Now the display is still blank but the oven wont work anymore. The light turn on and off by opening/closing the door but the turntable does not spin and the magnetron doen not turn on. Is it a bad control unit? Do you have a replacement part? Thanks for the assistance

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William Miller

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  • Dacor Master 9,179 Answers
  • Posted on Feb 12, 2010
William Miller
Dacor Master
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Joined: Sep 15, 2006
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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
[email protected]
http://www.microwavedisplay.com

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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 [email protected] if you need more free advice.
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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.
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The touch screen on our Dacor DMT2420S is lit, but there are no "buttons" to use to control the microwave. None of the other buttons work either.

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.

We have very good success with these models.

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

William E. Miller
[email protected]
http://www.microwavedisplay.com
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Dacor Microwave DMT2420S control panel screen white

It is the CPU/display assembly that has a problem.

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

In my professional opinion, there are weaknesses in both the design and manufacturing.

Our proprietary modifications and repairs are designed to not only repair these, but prevent them failing again.

We have the service / repair manual for this model and have uploaded it to our site here for free download to help you with disassembly.

Please tell your builder about us.

Feel free to contact me directly (and please remind me of your full model number from the tag on the unit) for more information & help.

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

William E. Miller, AS-EET
[email protected]
http://www.microwavedisplay.com
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DACOR microwave, model DMT 2420S. Display is scrambled.

There are two options for this model:

- You can order our exclusive modified control unit (# CU440) 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. For details, see: http://www.microwavedisplay.com/exchange.htm

- Or we can repair your existing control unit for $39.95 in about a week or so with a one year guarantee.


Feel free to contact me directly (and please remind me of your full model number from the tag on the unit) for more information & help.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
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Dacor DMT2420s when started makes a loud buzzing sound

The fan could have an obstuction. I have heard of tech sheets getting into the fan and causing a vibration and vibrating sound.
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Display panel is scrambled on my Dacor DMT2420 microwave.

There are two options for this model:

- You can order our exclusive modified control unit with our proprietary upgrades for $135, then if you return your defective control unit in repairable, good cosmetic condition, we'll give you a core refund of $40.

For details, see: http://www.microwavedisplay.com/exchange.htm

- Or we can repair your existing control unit for $39.95 in about a week with a one year guarantee.


For details, see: http://www.microwavedisplay.com

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
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DMT2420s

We repair these control units for customers nationwide with our guaranteed $39.95 service.

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.

Feel free to contact me directly.

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

William E. Miller
[email protected]
http://www.microwavedisplay.com

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