Manual Says: Switch off the machine and unplug it, wait for approximately 1 minute and then switch it back on again.
I also found the below regarding a Hotpoint (which appears to be the same machine). That solution seems to have helped several with the F11 error code.
This is a cut and paste:
"I found part of the answer via another forum. The F-11 code is for a drain pump activation failure.
After checking that the filter and drain hoses were all unblocked, I then had a thought. The machine stopped mid-way through the spin cycle while it was vibrating, so I wondered if it was going to be a wire that had shaken loose. Being an inquisitive kind of girl who likes a challenge, I decided to have a look myself.
I managed to haul the machine out from under the worktop to access the back panel. I then undid six screws to remove an inspection panel. This came off relatively easy and gave me a very good view of the water drain pump at the front. Leading to this were two red wires. I reached in to check if these were loose and ....
"HEY PRESTO!"
When I gently pushed the white plastic connector to see if it was loose, it simply clicked back into place. My washing machine is now working perfectly!
Yee-Haaaaaaa!"
