Keurig K3500 Error Codes & Solutions

The Keurig K3500 has several error codes associated with this unit. Some of these codes will be passive and will still allow the unit to function normally and then there are codes that will require a system reset or reboot (unplug/plug and turn it on again).

In addition, there are a few codes that you will not be able to reset the brewer and you will need to replace components or send it off to an authorized repair shop. Since this unit is still relatively new in the industry as I write this post, I will try my best to give good descriptions for each K3500 Error Code that is available. Codes can appear on the home screen and in the Technician Program.

Machine Passcodes

Passcode Role	Passcode
Managers	23456
Technician	34567

All Error Codes

K3500 Error 1

This error can have two results, The first and easiest is quite simple. The hot tank does not fill within the allotted time and the machine faults.

• Check your water source and make sure the water is turned on, if you have a slow water feed just turn the machine off and on to clear the error and it will start to fill again
• Inspect any filter system you might have in line with the water source, the possibility of it being plugged because of improperly maintaining it.

The second reason can be the hot tank Thermal Cut-out has faulted (just like a fuse it pops) The Hot tank module will need to be replaced in this instance

K3500 Error 2

Similar to the first error but on the preheat hot water tank thermal cut-out has popped or blown or the tank is still empty. The error is visible on the screen until it is rectified. Once the tank is replaced the error can be reset by turning the machine on again.

K3500 Error 3

Once the brewer dispenses 2000 brews the unit will ask for it to be descaled You can keep using the machine with this message and you can Dismiss the message from the display.

K3500 Error 4

This error is the cold-water tank is not filling up in the given time. The machine will not function until the error is fixed (replace the cold tank) to reset the machine you just need to turn the unit back on after fixing the error.

K3500 Error 5

An overfill has been detected. The cold-water tank level is low. You will have to reset the machine and clear the error. The cold-water tank might need to be replaced.

K3500 Error 6

The preheat hot tank is too cold. This can happen if the machine temperature is under >40F. (If the machine was stored in the cold for any reason) You need to wait for the machine to warm before the start-up procedure. If a reset doesn’t clear this issue, it may need a replacement of the Hot tank module

K3500 Error 7

The brew hot tank is too cold. This can happen if the machine temperature is under >40F. (If the machine was stored in the cold for any reason) You need to wait for the machine to warm before the start-up procedure. If a reset doesn’t clear this issue, it may need a replacement of the Hot tank module

K3500 Error 8

The preheat hot tank has overheated. Restart the brewer.

K3500 Error 9

The brew hot tank has overheated.

K3500 Error 10

4oz fill has timed out. This could be an indication there is a clog in the entrance needle or the exit needle or a scale build-up in the hot tank

K3500 Error 11

Top of tank sensed on post-fill. This would be a scale buildup issue, you can descale your machine or it may need the hot tank replaced

K3500 Error 12

6oz fill has timed out, this could be an indication there is a clog in the entrance needle or the exit needle or a scale build-up in the hot tank

K3500 Error 13

8oz fill has timed out, this could be an indication there is a clog in the entrance needle or the exit needle or a scale build-up in the hot tank

K3500 Error 14

10oz fill has timed out, this could be an indication there is a clog in the entrance needle or the exit needle or a scale build-up in the hot tank

K3500 Error 15

12oz fill has timed out, this could be an indication there is a clog in the entrance needle or the exit needle or a scale build-up in the hot tank

K3500 Error 16

The vent valve is defective and will need to be replaced

K3500 Error 17

Overpressure is detected, I have seen this error before and have had to clean out the entrance needle. You need to remove the shroud that covers the Kcup holder area. Once removed pull off the rubber valve above the entrance needle and clean it from debris. Don’t forget to clean the needle as well.

K3500 Error 18

Dispense timeout detected solution is the same as above error 17 – in addition perform a rinse brew.
K3500 Error 19

The heater has timed-out The heater had taken longer than 10 minutes to reach optimal temperature. This error code is a good indication the hot water tank module will need to be replaced. The module has failed and requires replacement

K3500 Error 20

Temperature sensor malfunction Again this is a failure of the hot water module and requires replacement to repair.

K3500 Error 21

Top of tank sensed on fill, this error is a good indication your unit needs a descale or the hot water module requires replacement to repair.

Resetting the errors with the technician menu

To reset any errors that occur in the error log, you will need to sign into the Technician Menu.

After signing in with the passcode 34567, scroll down to the Error Log

Select the Error Log to view 

 Select and clear the complete log or an individual Error, the most recent error displays at the top of the log

Once the Error Log has been cleared, the Error Log Cleared screen will display for 2 seconds and then return to the Error Log screen.