Need to know which keurig i have. Serial number is 500 4200 0056888

It is located in the bottom right corner of the digital screen. Where is the serial number on Keurig® 2.0brewers? To find the serial number, remove the water reservoir, the 14 digit number is located on the now exposed side of the brewer.

did you try the model number or serial number and look it up on line? If that does not work then call bed, bath, and beyond and ask them. They have sold those since inception and will most likely be able to tell you

It should be noted on the serial number label

I looked at a video on the Keurig Customer site. The serial number on my unit which is a K10 is the bar code number located on the bottom of the unit. I removed the drip tray and turned the unit upside down. On other units it may be on the back wall of the drip tray housing. You have the remove the drip tray and shine a light into the slot. Once again it is the black/white barcode label with a number. I don't know where it is on your unit but it is somewhere and should also be the barcode label. Hope this helps.

The Serial Number is located on the
bottom of the Brewer on a white sticker

You need to drop the 3rd period...it's in the format of xx.xxxx.xxxxxxx

Pull the drip tray out and the serial number is on a sticker where the tray slides into the main unit. You have to get down low and look straight in and you will see it.

I had the same problem. I tried the following format and it finally worked:
xx.xxxx.xxxxxxx

Apparently you need to put the decimals in. Good luck.

I need to Know What is the color light in seeht gauge tube, Yellow Flash Need to be descale, if red solid or flashing is a heating probleme. If red flashing in seeght gauge tube is usaly the temperature sensor probe is fail. and for the moment i Have not found similar parts to replace but i work on it.