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Verify whether or not the date and time appear on your Brother machine's LCD. If anything is displayed on your Brother machine's LCD, then it is most likely receiving power.
If your Brother machine's LCD is blank, continue toStep 2.
If your Brother machine's LCD displays a message other than the date and time, please refer to the FAQ about the message being displayed for further information.
Verify the Brother machine's power cord is connected securely to the power outlet. If you are using a surge protector, extension cord, or power switch, disconnect it and plug the Brother machine directly into the wall outlet.
If the Brother machine is turned OFF, its LCD will be blank. Please make sure the Brother machine is powered ON by pressing and holding theOn/OfforPower Savekey. This key is located in the upper-right corner of the control panel.
If your Brother machine's LCD is still blank, connect it to a completely different, known working power outlet. If the Brother machine powers up, then the problem is related to the original outlet.
Confirm the power outlet is working by plugging another known working device (a lamp, radio, etc.) directly into the same outlet. If the other device does not work, the problem is related to that power outlet. If a wall switch controls the outlet, verify that the switch is ON.
If your Brother machine still will not power on, please contact Brother Customer Service.In Case You Still face Problem and Need Online Assistance Then Please Follow Us For On :
If the drain time exceeds 8 minutes the water valves turn off. After 4 minutes the “Sd” error will be displayed, then 4 minutes later the F21 error code will be displayed.
Press PAUSE/CANCEL two times to clear.
1. Check the drain hose and make sure it is not plugged or kinked. 2. Unplug washer or disconnect power. 3. Check the electrical connections at the pump and make sure the pump is running. 4. Check the drain pump filter for foreign objects. 5. Plug in washer or reconnect power. 5. If the above does not correct the problem, go to step 7. 6. Unplug washer or disconnect power. 7. Replace the pump.
Alternative Procedure: If the machine cannot be forced to its diagnostic mode then:
1.Disconnect the washer from the power supply and water supply. 2.Remove the top panel by taking out the three screws in the back of the washer. The pressure switch is right on top. 3.Remove the Molex connector from the water level switch / pressure switch. Refer to the picture below. 4.Reconnect the power supply but not the water supply. 5.Power the machine. The machine will enter diagnostic mode. 6.Power off the machine. 7.Replace the water level switch / pressure switch. 8.Reconnect the water supply. 9. Power on the machine it will work without error
It's difficult to say without seeing the machine or having a failure code.
The machine looks for a switch to close as it fills with water. Maybe a pressure switch?
You could find the switch and see if it clicks when blowing into it and even test it with a meter.
That's an easy test.
Maybe the module has failed.
Hope it's given you something to look for.
That means that the machine is sensing excessive suds. I just got the same message on my Duet today. The problem with mine, however, is that there is an issue with drainage. We emptied the drain filter and are currently trying to get it to work properly. It switched from Sd to F-21 and has repeated F-21 5 times until just now when it continued on in the drain/spin cycle to actually spin the clothes. Will keep you posted...