OK - turns out pump is much easier to access than I thought. Took front panel off & low/behold a "service manual" taped to it! Code F-33 is check pump. Pump filter had 3 huge pcs. of sleeping bag string sucked all way inside pump. Code F-21 means "slow drain" which could be too much suds or in my case check pump.

This was a no brainer repair. Hardest part is getting water out of machine first. Use a cup, sponge, syphon hose etc. Then use a plastic paint tray under pump filter and unscrew it just enough to fill tray then dump out. Only takes about 4 times. Sooper easy.

I had the same problem with my Whirlpool Duet today and was able to figure out the problem for $0.00. I should preface this without any help from the Whirlpool hot line, which were no help at all and rude at times on the phone.
Enough complaining...The problem you have is do to the design of the washing machine to allow items that were left in pockets to get down into the pump and pump filter chamber. The pump is located in the bottom, front, right hand side of the machine. I unplugged the machine first, then removed the back panel, removed the two hoses on the pump which you will want to have plenty of towels around for, then I loosened but did not remove the two screws in the bottom of the machine that give the pinch to the rubber base of the pump, then slide the pump slightly and it will pop out. Unplug the electrical connector to allow the pump to come all the way out the back.
There is a large hand tightened cap on the front of the large chamber in front of the pump that collects all the garbage left in your pockets. Get all this stuff out. Also you can separate the pump from the filter hosing and make sure there isn't anything like paper clips ect. in the pump blades. This was the problem I had. I pull the following items out of the filter chamber.
$1.13 in change, that included three quarters, 3 DS gameboy sticks, 6 paper clips, 4 hair clips one of which was also in the pump blades, a ring, and allot of hair/lint. Well the service Tech. I call said the repair would be around $350. if they need to replace the control board but I guess in the long run I ended up making or at least finding money in the process. Hope this helps other people out there with the same problem. I should also say that Whirlpool has the service manual taped to the inside bottom front of the machine. This has all the codes and possible fix actions for each problem. I guess they figured the homeowner was more likely to misplace these and the service Tech. would need them and find them when the machine was turn apart for service.

The prior posts were right on the money. However, cleaning mine didn't fully cure but I've not been able to separate the motor from the filter yet. Pump works initially in cycle but in later stages gets really hot around the windings above the pump motor.

The paint tray for emptying water from filter works great once you've gotten the level down. Another thing that worked great for me was to remove the bottom panel and use a bucket that fit under the door. Open door when water level is high and it dumps in bucket (square works better than round bucket) with almost no mess at all. Empties washer much faster than doing it all in paint tray and cleaner than a pile of towels under door...

May be new pump before day is out at about $60. MUCH cheaper than service technician doing work that is relatively simple. Thanks all...

I cleaned out my pump and hose, but it still won't drain. It was clogged with money and gunk.
Is it likely i burned up the motor / pump?

Wow this was an easy fix. Had a hard time finding out there were 3 screws on the very bottom of the bottom panel. Used a pry bar to lift the machine up a little so that I could see under. Unscrewed the cap beside the waterpump and let water drain into a shallow pan. When I got it open I found $10.80 plus about 25 cents in pennies. Also some lint. Not too bad for about an hour worth of work. We have had this washer for about 3 years...we bought it from a rent to own and I think it was 2 or 3 years old when we got it. This is our first problem. So I am really happy with this machine.