After wash it drains then it tries to rinse and stays at 20 minutes

You will need to check and see if the drain pump has something caught in it.

Some dishwashers will now wait before draining final rinse water. This helps the dishes dry. Instead of draining the hot water it will save it for a short time to dry dishes. Wait 20 minutes it should drain after that.

Check if drain filter is clear and drain pump is working properly. Also remove soap conditioner tray and check if you have black residue inside the soap/conditioner dispenser. Sometimes this can prevent water from entering the conditioner tray.

Just had the exact same issue with my F&P it would stay in the drain cycle(without draining). It would show 2 minutes left in the cycle, dropping to 1 minute, but would never complete the cycle.
For some reason the machine would not drain the water from the drum and would continually remain in the drain cycle, spinning the load(back & forth), but not draining the water.
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This is how I sorted the machine: -
1. I turned off & unplugged the machine.
2. I drained the machine manually. Opening the manual drain compartment located at the bottom right of the machine.
a). Firstly drained the majority of the water using the small black hose into a plastic container(ice cream container will be fine). Took a little while as the machine was quite full and I also didn't want to flood the laundry.
b). Once I had drained most of the water I undid the filter plug to drain the remainder of the water, which wasn't too much & was able to mop up with a towel. I gave the filter a good clean, removing as much build up in there(which in actuality was very little lint, gunk, etc. Though I did find a small button & a collar stay wedged in there).
3). I blew very hard into the washing machine drain hose a few times(read this on another forum so thought I'd give it a try!). Use a plastic bag, etc. to cover the hose etc. for hygiene purposes :)
4). I then plugged & turned on the machine. The machine went straight back into the 2 minute drain cycle. It attempted to drain/pump remaining water, however this time machine successfully went through the 2 minute drain cycle. Machine stopped, counted down, click and I was able to open the door.
I put the washing through a rinse setting to see whether the machine would complete cycle. I can happily report that the machine completed the rinse cycle on the washing with no issues. I also put through another load to see if it would complete a full wash cycle, which I can report it happily did so.
This may have just saved me a grand$ :)
Good luck.
cheers
Monkeyboy :^)

If the unit does not spin correctly, this is usually an indication that the unit can also not drain. The unit will not spin if it senses a blockage or issue with the drain lines and/or pump. Try to check the drain lines in the back of the unit for any issue, and then see if you have an access panel to get to the coin trap or drain pump itself. Often socks and debris will clog up in this area and cause your problems.

Try running the drain hose into a bucket next to the machine. If it drains Ok, look for the restriction in your plumbing. If it won't drain into the bucket, look for a closed drain valve, open fill valve, bad middle or top probe, check power at drain connector ( it's DC volts from the bridge rectifier in the top drawer on the relay board.. Basically, water is at top probe at beginning of rinse, or it didn't drain down after the wash. Drain hoses can kink from hot water if not routed well.

replace the water pump. about 46 dollars and a 20 minute job.

It sounds like a siphon issue.
Check that the drain hose does a high loop before it goes into the drain pipe. (ie. drain hose loops above the water level inside the tub). Make sure the drain hose is not pushed too far down into the drain pipe. Also if the drain hose is sealed to the drain pipe this will create an airlock and a siphon will occur, allow air to enter between drain hose and drain pipe connection.
This should help you but if there is still a problem let me know and I'll try to assist you further.
Good luck!

f2 error means long drain or no drain
check the drain pump
replace drain pump if nessesary

ck wiring to motor be sure all conections are tight lid switch is ok since will agitate also ck control bd for connections most likely suspect all ck ok is control bd itself