Adg450 about 5 yrs old. Beep Beep.....Beep

Try a Power Reset in the last section.

Why Your Microwave Beeps, and How to Stop It - Appliances ...

https://www.appliancesonline.com.au > why-your-micr...
Why is my microwave beeping? There are three reasons why microwaves beep: The beep that ...

https://www.google.com/search?q=CDA+SV451SS+MICROWAVE+constant+beep

..

Not enough details. What is the model number and how did you come up with error code 34. That code only applies to a very old model ( over 20 yrs old) While it is beeping do not press ant buttons and write down which lights are on along the top row. Count from the left and tell us which number lights are on and which are off.

If the beep stopped then what is the problem you want help with now?

forum.appliancepartspros.com/oven...ranges-cooktops/5209-maytag-ove...

https://www.maytag.com/product-help

My dryer did the same thing, it was so distrubing noise in the middle of drying cycles, so I turned off the sound switch it went away, now it doesn’t peep any more.

No Beeps
No Power, Loose Card, or Short.
1 Short Beep
Normal POST, computer is ok.
2 Short Beep
POST error, review screen for error code.
Continuous Beep
No Power, Loose Card, or Short.
Repeating Short Beep
No Power, Loose Card, or Short.
One Long and one Short Beep
Motherboard issue.
One Long and Two Short Beeps
Video (Mono/CGA Display Circuitry) issue.
One Long and Three Short Beeps.
Video (EGA) Display Circuitry.
Three Long Beeps
Keyboard / Keyboard card error.
One Beep, Blank or Incorrect Display
Video Display Circuitry.

i have the problem when i turn power on 2 green wash cycle lights plus the red lid lock stay on with constant beeping every second then when i push the start button the 2 green lights go out and the red lid lock light stays on but no beeps please help

It looks like the door switch was not making because the door is defective. Also the switch may just be bad.

well i don't have any experience with this brand but i would say you need to change the fill switch it senses how much water is in the tub shuts the water off then starts the washer its also called the pressure switch

you probably have a foreign object in the pump impellor - the favourite is bits of bra wire