Washer won't stay on heavy duty setting, keeps reverting to regul

The problem with the fabric softener not dispensing is not likely related to and F03 error code due to the washer not draining.

For the dispenser problem, I recommend that you pull the dispenser drawer out and clean it thoroughly.
The fabric softener dispenser works on a siphoning principle.
Make sure that the siphon hole in the dispenser is clear and not restricted or plugged.

You can fill the fabric softener compartment with water and make sure that it is siphoning properly while you are cleaning it.
Make sure that the cover is properly replaced on the fabric softener dispenser when the drawer is replaced in the washer.
You can use the diagnostic test described below to test the fabric softener dispenser.
If the softener dispenser does not fill and dispense properly, you could have a failed dispenser valve, a failed control board or a wiring failure between components.

You indicated that you tested the pump and that it is good. You could have a clogged drain hose or a clogged washer drain that would prevent the washer from draining.
You could also have a failed drain pump even though it runs. If the impeller is jammed or damaged, it will not pump out the water in the washer.
You will likely need to unplug the washer and drain the water out of the tub using a wet/dry shop vacuum.
To check the pump and drain hose at the bottom of the washer, remove the bottom front service panel and remove the drain pump. You may find a clog or restriction in the drain pump or connecting hoses. If the drain pump is damaged or will not work, it will need to be replaced.



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