Repair guides and support for top and front loading Whirlpool brand washers.

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Whirlpool duet sport washer won't agitate or spin.


I have a Whirlpool duet sport washer WFW8300SW02. 

5 month ago it stopped spinning/draining. I cleaned up the pump. It still won't spin at the end of the cycle, then stopped even agitating at all. I measured the motor resistant according to the manual. By exclusion I found out that pressure switch is faulty. Changed the pressure switch and it worked fine for 5 month. But now it stopped again.

Current symptoms:

- Turns on fine, then when I start any cycle, door locks immediately and it will be stuck at add gourmet light on and will do nothing more than a clicking sound every few seconds (I will try to record the sound and post it). When I unplug it and plug it back, it starts filling immediately (with add gourmet and wash lights both on) without me pressing any buttons, dispenser motor rotates as if it is dispensing detergent, it fills and drains, fills again (rinsing) and drains. But no agitation or spinning at all. And then it gets stuck at 2 minutes remaining.

- Tried to run diagnostics test. The errors stored were: (F-21, F-26, and F-28) . After cycling through these codes, the test is supposed to start. But it just keeps flashing the light of spin/rinse and doing the clicking noise with nothing showing on the display until I unplug it.

- I also notice that the motor heats up really bad if I leave stuck at the clicking noise whether in the test mode or cycle mode.

- Clicking stops  (but it still doesn't start the cycle) if I disconnect the MCU connection at the CCU (MI3). It also stops when I disconnect the motor from the MCU by removing the connection at the MCU side. 

What I tried:

1) Replaced the pressure switch with another one again. Nothing changed.

2) Measured the resistance on the motor pins following the manual, all give 6 ohms as expected.

3) Tried to measure the electricity going into the CCU, reads 120 volts. But when I measure the two pins (MS2) where the CCU gives electricity to the MCU, I can't see any voltage readings (not sure if this should give 120v as well) Should it? 

Also the pins connected to the door lock don't read any voltage either (tried to measure as AC, but I am not sure if this is DC or something else).

Can you please help me diagnose the CCU or the MCU to see if they are faulty? How can I measure continuity there? Or otherwise if you have any ideas please let me know.

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Chosen Solution

The F21 error on this line of washers is the machines way of saying the water took to long to drain from the tub. This could be a problem with one of the washer parts including the drain pump itself, how the drain hose enters the stand pipe, or maybe even something is stuck somewhere in the drain system and is preventing the water from flowing properly. Not quite an emergency, but it is an indication of a problem and a problem that can lead to something bigger if not looked into.

From Old Turkey on SUD - According to the service manual there are a few possibilities

Sud - SUDS LOCK (Overdose of Detergent detected during the Wash Cycle)

The motor control unit senses a suds lock condition by analyzing the current draw on the drive motor. If “Sud” is displayed a potential suds lock is detected. This may signify a bad pump, an extra heavy load, excessive detergent, or excessive suds.

• If too much detergent was used, run the unit through a Rinse/ Spin cycle then a Normal cycle without adding any detergent. This should clear the unit of the excess detergent.

• Check the drain hose and make sure it is not plugged or kinked

• Check Wire Harness connections to the Drain Pump, Pressure Switch, and Central Control Unit (CCU)

• Check/ Clean Drain Pump Filter of foreign objects

• Check Drain Pump

• Check the Pressure Switch

• Check CCU

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