ERROR CODE F-3 F2

F3 E2 error code is indication of a water temperature sensor (NTC) error, or heating circuit failure.
Check the water temperature sensor and check connections to the water temperature sensor.

That is an NTC (water temp sensor) failure. The NTC sensors themselves are not very common to go bad. What I find to be the most common issue is where the harness is zip tied to the outer tub you will get a break in the wire. This can cause the problem to be intermittent as well. I would first removed the connector from the main control board and OHM through the wiring all the back to the NTC. If you have an open circuit you can go directly to to the sensor and test it. If the sensor checks ok then you know you have a break in the wiring. I usually just tug on the wiring and you will usually find the break. If the wiring and sensor both check ok then you will be looking at a CCU (central control unit) issue. Hope this helps.