How to Use Diagnostic Mode on a KitchenAid Refrigerator

Introduction

If a KitchenAid refrigerator (or a Whirlpool model with the same newer-style dispenser interface) won’t cool, ices up, won’t make ice, or has odd behavior, the built-in diagnostic menu can help you pinpoint sensors, fans, defrost, compressor operation, and ice maker issues without guessing. This guide shows how to find the technician sheet, enter and exit diagnostic mode, navigate the service tests, and interpret the most common on-screen result codes you’ll see.

What you need

Step 1 Prepare safely and confirm model variation

Keep hands dry, and don’t touch exposed wiring or metal electrical parts while the refrigerator is powered.
Use caution around sharp sheet-metal edges when reaching into cover areas.
Expect minor differences by year, because newer units may have more service tests and older units may have fewer, even when the test numbering stays consistent.

Step 2 Check the dispenser interface style

Confirm the refrigerator has the newer Whirlpool-style dispenser interface used for ice and water controls.
Use these instructions whether the interface uses physical pressable buttons or a touch screen, as long as the layout matches this style.

Step 3 Locate the technician sheet

Use a ladder to reach the upper right corner of the refrigerator cabinet.
Use a Phillips screwdriver to remove the screws securing the plastic cover in that corner.
Remove the plastic cover to expose the technician sheet with diagnostic tests and codes.
Use the technician sheet to verify which test numbers and codes apply to the exact refrigerator, because the list can vary by model and year.

Step 4 Identify the diagnostic buttons

Find the two dispenser-interface buttons used to enter diagnostics, commonly labeled Ice Mode and Light.
Treat these as software button one and software button two even if the labels differ on the refrigerator.

Step 5 Enter and exit diagnostic mode

Press and hold software button one and software button two at the same time for three seconds.
Release the buttons when you hear the chime.
Watch the display to confirm service mode is active, because it will begin showing test information and flashing codes.
Exit diagnostic mode by pressing and holding the same two buttons for three seconds.
If the interface won’t recover, unplug the refrigerator for about five minutes, then plug it back in.

Step 6 Navigate between service tests

Press the button with a plus sign to increase the service test number.
Press the button with a minus sign to decrease the service test number and return to an earlier test.
Write down the service test number and any displayed result code before moving on.

Step 7 Interpret the thermistor tests

Go to service test one to check the freezer thermistor resistance value as reported by the control board.
Read the result code shown on the temperature display, where 01 means pass, 02 means open, and 03 means shorted.
Go to service test two to check the refrigerator thermistor using the same 01 pass, 02 open, and 03 shorted result codes.

Step 8 Test evaporator fans and the air baffle motor

Go to service test three to control the refrigerator and freezer evaporator fan motors and the air baffle motor.
Press software button number three to cycle through the available fan and baffle modes.
Press and hold software button number three to run both fans simultaneously when that option is available.

Step 9 Avoid getting stuck in the timed compressor service test

Use caution with service test four, because it is a timed compressor, condenser fan motor, and evaporator fan service test.
Expect a three-second delay before step one starts.
Let the test auto-advance, because each step is timed and proceeds automatically.
Don’t try to exit during the timed steps, because the control will play an invalid chime and won’t let you out mid-step.
Advance to service test five quickly unless you specifically need to run the full service test four sequence.

Step 10 Check compressor status and speed

Go to service test five to view compressor status and speed behavior.
Press software button number three to ramp the compressor to maximum speed and display 01.
Press software button number three again to display 04, then allow the compressor to ramp down to minimum speed and display 02.

Step 11 Use defrost system diagnostics

Go to service test six to check the defrost bimetal thermostat status.
Interpret 01 as the bimetal closed and 02 as the bimetal open.
Go to service test seven to check whether the refrigerator is using adaptive defrost control (ADC) or a basic defrost mode.
Interpret 01 as ADC on and 02 as basic mode that defrosts on an eight-hour schedule.
Use the basic defrost option as a troubleshooting aid if the unit is icing up.

Step 12 Check UI indicators switches and door functions

Go to service test eight to confirm all UI indicator lights operate.
Go to service test nine to verify each UI button or pad responds when pressed.
Go to service test eleven for the dispenser lighting test if the control skips from nine to eleven on the display.
Go to service test fifteen to check the ice level sensor status for whether the ice bin is full.
Go to service tests sixteen and seventeen to check door switch inputs by opening and closing the doors and watching the displayed state change.
Go to service test eighteen to run the ice door motor test and confirm whether the ice door is operating.

Step 13 Check heaters sensors water filter info and software versions

Use service tests nineteen through twenty-four to view ice maker fill tube and fascia heater status, water use ratings, and water filter usage, time, and reset information.
Use service test twenty-five to view the vertical mullion heater status.
Use service test thirty-four to view the vertical mullion heater mode and whether it is running.
Use service test thirty-three for the humidity sensor control, service test thirty-six for the icebox fan status, and service test thirty-seven for the icebox thermistor resistance value.
Use service test thirty-nine to check the refrigerator evaporator thermistor for pass, fail, or short.
Use service tests twenty-six, twenty-seven, twenty-nine, thirty-one, forty-two, and sixty to view the software revision versions for the main control and various UI modules.
Expect some test numbers to be skipped by the control, because this interface may jump over unused tests.

Step 14 Use forced defrost mode for troubleshooting

Go to service test thirty-eight to place the refrigerator into forced defrost mode.
Read OF as forced defrost off, and cycle the status to select a short defrost or a long defrost when available.
Use caution when forcing defrost, because it will defrost the lower cabinet and push air up to the top cabinet.

Step 15 Run ice maker tests and interpret ice maker error codes

Confirm there is no ice in the ice maker before running any ice maker water fill-related test.
Run service test fifty-seven to harvest and eject ice before trying to fill, because filling with ice present can overflow and create major issues.
Use service test forty-five and the temperature cycle selector to command an ice maker harvest option for ice maker testing when available.
Use the water dispensing test to force water dispensing for troubleshooting.
Use the ice maker error code display to check for E0, E1, E2, E3, E4, or E5 and note the code shown on the screen.
Use the ice maker harvest test and press software button number three to start an ice harvest cycle when needed.
Use service test fifty-eight for ice maker heater activation and thermistor checking, and use service test fifty-nine for the ice maker motor test.

Step 16 Check factory codes and return to normal operation

Use service test sixty-six to view manufacturing codes, which may include E0, E1, E2, E3, E4, E5, E6, and ER.
Treat service test sixty-six as factory-oriented information that may not be useful for routine home troubleshooting.
Use service test sixty-seven to view the water filter switch status indicator.
Expect odd or undocumented entries such as service test seventy-three, because some displays can show test numbers that aren’t listed on the technician sheet.
Exit diagnostics by pressing and holding software button one and software button two for three seconds to return to operation mode.
Reinstall the technician sheet into its compartment and reinstall the plastic cover with its screws.

Conclusion

If you’re troubleshooting cooling problems, prioritize the thermistor tests, evaporator fan test, compressor speed test, and the defrost-related tests, and write down every test number and code you see before leaving diagnostics. Don’t run ice maker fill-related functions unless you’ve confirmed the ice maker is empty or you have already harvested and ejected the ice.