Whirlpool AWO/D 7740 error code F23

don't touch it
as it is still under warranty , call in a service technician for a warranty repair

Display shows an error code - Front-load washer ' Whirlpool ...

https://www.whirlpool.com/...error-code...w...
Whirlpool Home AppliancesCheck the following answers for error-code related issues you can correct: ... Duet SportTM washer - F01, F11, F23, F24, F27, F28, F29, F30, F31, and F33.

What does error code f23 flashing mean on a Whirlpool ...

F23 Pressure switch failure Should the main electronic control unit detect that the wash level contact (or level) is on and the switch level for wash heater safety is off for any more than ten seconds during a wash this error code will be displayed.
Resetting the program may clear this error but unlikely.

• Check the pressure switch or sensor for operation and electrically
• Check the wiring from the main electronic control card to the level sensor
• Check all connectors between the main controller and pressure switch
• Run test program
• Also see F08 and F12 as heater failure can cause this error to occur

F23 Pressure switch failure Should the main electronic control unit detect that the wash level contact (or level) is on and the switch level for wash heater safety is off for any more than ten seconds during a wash this error code will be displayed.
Resetting the program may clear this error but unlikely.

• Check the pressure switch or sensor for operation and electrically
• Check the wiring from the main electronic control card to the level sensor
• Check all connectors between the main controller and pressure switch
• Run test program
• Also see F08 and F12 as heater failure can cause this error to occur

The fault F23 could be linked to the water temperature not reaching the right temperature. If your model uses hot water inlet connection then check if your hot water unit is providing the correct inlet water temperature. Otherwise it is likely the temperature sensor or heater element maybe failing.
See description
HEATER FAILURE
If the temperature increase during the first 40 minutes is less than 86degF (30degC).
1. Unplug washer or disconnect power.
2. Check connection to water heater.
3. Check resistance of heating element, if present on this model. (abnormal = infinity)
4. Check the water temperature sensor and connection to it.

Could be a slow drain time issue. Excess wear makes it drain slow.

This error occurs when heater fails in the unit .
Try this

1. Unplug power chord to the washing machine .
   
2. Check connection to water heater .
3. Check resistance of heating element .
   
4. Check the water temperature sensor and connection to it.
   

Hope this helps .

The following list of codes indicates an electronics communication problem with the washer:
Duet HT® washer - F01, F03, F06, F11, F23, F24, F27, F28, F29, F30, F31, F32, F35, F42, F61, F62, F63, F64, F65, F70, F71, and F99
Duet® washer - F05, F07, F09, F10, F11, F13, F14, F15, F21, F22, and FdU
Duet SportTM washer - F01, F11, F23, F24, F27, F28, F29, F30, F31, and F33

To remove the error display, press Pause/Cancel twice.

If Pause/Cancel does not work:

1. Unplug washer or disconnect power for one minute.
2. Plug in washer or reconnect power.
3. Re-select the cycle and press Start.

NOTE: If the error remains on the display, call for service.

HOW TO FIX WHIRLPOOL WASHER F23 ERROR CODE What does F23 mean on whirlpool washer? It means there is a heater failure. If the water temperature in the washer fails to reach 86 degrees or higher then the washer will give the F23 error code. To fix the whirlpool washer f23 error follow the steps listed below.
Note: Some models do not have a heater as shown below, some models just have a temperature sensor. If your model does not have a heater just skip to checking the temperature sensor.

1. First unplug the washer.
2. Check the wiring to the heating element make sure its not burned, broken or corroded.
3. Check the heating element for continuity of course if it does not have continuity then replace the element.
4. Check the water temperature sensor wiring for corrosion or breaks.
5. Remove the wiring harness from the temperature sensor and measure the resistance of the sensor. Refer to the chart below and if its out of range replace the sensor.

see link below for details and where to buy the part which is under $80 and fairly easy to replace
How To Fix Whirlpool Washer F23 Error Code Appliance Repair Guides

I don't have a manual on the newest dryer like you have, but one of the models just older than yours has a F23 code that indicates a shorted thermistor.( temp sensor )
Since it is new you need to call for service. They will usually look up the code and tell you if it is anything you need to check but most likely you will need a repairman to repair it in warranty.
Post back if you have any questions.