F21 code still flashes after i've unclogged line - reset?

This Bosch looks like a Kenmore HE2, and may be made by the same manufacturer.

In the Kenmore HE2 manual it states:
"F" Variables [F4 to F16] (Electrical problem)
Select PAUSE/CANCEL twice to cancel the cycle.
Select DRAIN/SPIN if there is excessive water in the washer.
Re-select cycle and press START. If the problem remains, call for service.

If it's not working still, try asking advice at RepairClinic.com . They have helped me in the past, and they have parts too.

See if this link will help. Fix the F21 Code Unclog the Washer Drain Angela Says Here's another video to see Bob. Whirlpool Duet washer will not drain F21 Error Fix VERY EASY

ok - this works even though it probably isn't the "best" solution. Unclog the input and output nozzle ares with a pin. The input area (behind the solution) was my clog problem - I put 2 or 3 drops of CLR into the hole, waited 5 minutes, then primed the trigger. This unclogged it! Fill the tank with a 1:1 ratio of white vinegar and warm water. Insert tank into unit and spray out the contents into the sink. This will eliminate any leftover CLR residue and clean the nozzle thoroughly. For the intake (suction part of the tank) I just rinsed through the lines with the vinegar mix and it seemed to unclog the rest. These things are a pain to take apart and if you break any pieces you'll be stuck - replacement parts have been discontinued for older models.

Considering what you've already tried, I'd suggest it is an error with the check ball in the tub to pump bellows.
Try this link, (you made need to copy & paste to your navigation/tool bar)
http://fixedappliance.blogspot.com/2011/11/whirlpoolkenmoremaytag-more-f02f21-sd.html
omit the talk of detergent and pump cleaning since you've done that and instead focus on the check ball device that commonly gets stuck and initiates an F2/ F21 error on these washers.
For an abbreviated version, check out an earlier solution I posted here on Fixya a while ago...
http://www.fixya.com/support/t10901030-washer_wont_drain_he5t_code_f21

I don't participate here much nowadays, too busy. In fact you'll find many the same problems & solutions under my profile.

Good luck.
Regards,
Macmarkus :)

F21 relates to a motor or control board fault.

However, it is also caused by spikes in the mains and can be spurious.

To reset it.

Turn the appliance knob to the off or reset position, 12 o'clock.

Turn the knob to the 6 o'clock position.

Press and hold the spin button.

Whilst holding it, turn the knob to the 7 o'clock position.

Continue holding the spin button for about 5 seconds.

Release the button.

Turn the knob to off.

When your turn it back on it should have cleared the error code.

The way to check that everything is clear pour some water over the evaperator coil in the freezer and see that the water drains very quickly. Also you could use a can of compressed air that you would use to clean the keyboadr and what not on your computer and blow it in drain and clear anything remaining

Gene

F21 is a motor or control board fault.
This also can be caused by voltage spikes or surges; to reset it...

Turn the appliance knob to the off or reset position, 12 o'clock.
Turn the knob to the 6 o'clock position.
Press and hold the spin button.
While holding it, turn the knob to the 7 o'clock position.
Continue holding the spin button for about 5 seconds.
Release the button.
Turn the knob to off.
When your turn it back on it should have cleared the error code

If the problem continues then check the motor.

Hello,

The F21 error code is displayed when the water didn't drain in the normal time,the usual reason the washer did nto drain with in the normal time is because the filter screen on the pump is clogged. This tip i wrote will show ya how to take apart the washer and clean the filter on the pump.
http://www1.fixya.com/support/r10121384-check_when_duet_washer_door_locked_after


GENE

“F21” (AKA SD) is a Long (SLOW) Drain error (LD). If the drain time exceeds 8 minutes this error code will be displayed. In addition, a “SUDS” error may also be displayed. This may be an indication of a drain pump problem and/or clog in the drain line. You will need to check the following:


1.First, attempt to unplug the washer for at LEAST 30 minutes to reset the Central Control Unit (CCU). Sometimes this is all that is required to correct momentary glitches with the unit. If the error code returns, proceed to step 2.
2.Check the drain hose to make sure it is not kinked or clogged.
3.Check the electrical connections to the pump and ensure the pump is running.
4.Remove the drain pump filter and check for foreign objects and/or debris.
To check the drain pump, click on the following link for step-by-step instructions

http://www.fixya.com/support/r385844-checking_drain_pump_kenmore_elite_front

If the above procedures do not correct the problem, it is recommended by the manufacturer to replace the drain pump.

Thanks for using FixYa - a 4 THUMBS rating is appreciated for helping with your FREE question

"F21" is a Long Drain error. If the drain time exceeds 8 minutes this error code will be displayed. In addition, a "SUDS" error may also be displayed. This may be an indication of a drain pump problem and/or clog in the drain line. You will need to check the following:


1.First, attempt to unplug the washer for at LEAST 30 minutes to reset the Central Control Unit (CCU). Sometimes this is all that is required to correct momentary glitches with the unit. If the error code returns, proceed to step 2.
2.Check the drain hose to make sure it is not kinked or clogged.
3.Check the electrical connections to the pump and ensure the pump is running.
4.Remove the drain pump filter and check for foreign objects and/or debris.
To check the drain pump, click on the following link for step-by-step instructions

http://www.fixya.com/support/r385844-checking_drain_pump_kenmore_elite_front

If the above procedures do not correct the problem, it is recommended by the manufacturer to replace the drain pump.

Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question