F27 is flashing after attempting to sanitize tub with bleach as directed.
The F27 error code indicates an overflow condition. If the washer is overfilled and continues to fill with water, this would indicate that you have an inlet water fill valve that is stuck open. If you unplug the washer and water continues to fill the tub, then the inlet fill valve assembly will need to be replaced. Make sure that the drain system is properly installed according to the installation instructions. An improperly installed drain system could result if siphoning of drain water back into the washer.
Check to see if the drain pump is working properly to pump out the water. When the F27 occurs, the drain pump will run constantly to pump out the water. The door will remain locked. Shut off the water supply faucets behind the washer. If water is not being pumped out of the washer, you could have a clog in the drain pump or drain hose. The following link of a previous answer provides advanced troubleshooting for a drain problem:
Why won't my HE4t washer drain?
If the washer is not overfilling and the F27 remains even after the washer is drained, then it is likely that you have a failed pressure switch. A failed electronic control board in the washer could also cause this problem. To access the pressure switch, unplug the washer and remove the top panel. Screws at the very back of the top panel secure it to the washer. Remove these screws and pull the top panel slightly back and then up and off of the washer. Sometimes, you can reset a stuck contact in a pressure switch by tapping on it with the handle of a screwdriver. I you cannot reset it, the pressure switch will need to be replaced. If you have the same problem after replacing the pressure switch, you will likely need to replace the control board in the washer.
SOURCE: My Washer is flashing an error message. F27
Error code f27
OVERFLOW CONDITION
If the overflow contact on the pressure switch is closed for more than 60 seconds, an Overflow Condition occurs. In an
overflow condition, the door remains locked and the drain pump runs constantly, even if PAUSE/CANCEL is pressed twice and the display is cleared. Turn off hot and cold water faucets and unplug the unit before servicing.
Check
1. Check the drain hose and make sure it is not plugged or kinked.
2. Unplug washer or disconnect power.
3. Check wire harness connections to the drain pump, pressure switch, water inlet value, and Central Control Unit (CCU).
4. Check/clean drain pump filter of foreign objects.
5. Check for drain pump failure.
6. Check the inlet valve for proper shut off.
7. Check the pressure switch for proper operation.
Good luck
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