Bosch's manual gives four steps for a WAT28400UC that shakes: the washer drum suspension system shifts as the spin speed increases, so a slight shake at the speed transition is normal, and mixing small and large items minimizes it; check that the washer is level and that all four feet press equally against the floor; check that the transport bolts have been removed; and press down on each corner of the top to check for wobble: there should be no give or movement. Lock the feet with the locknuts against the washer bottom without changing the height. Keep the floor solid and the washer on a firm level surface.
Differential
Likely causes of “Bosch 300 Series WAT28400 front-load washer shakes, walks or bangs during spin”, and how to tell them apart
- 1
Transport bolts still fitted
What separates it There is violent shaking because the transport bolts are still fitted
How to confirm Remove them per the installation section, and then level the washer
- 2
Feet not pressing equally
What separates it There is a wobble at a corner because the feet are not pressing equally
How to confirm Extend the foot, and lock the locknut against the base
- 3
A small or uniform load
What separates it There is shaking at the spin transition because of a small or uniform load
How to confirm Mix small and large items, and run the spin again
- 4
A soft floor
What separates it The vibration returns because the floor under the washer is soft
How to confirm Use a firm level surface, and move the washer
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether a corner wobbles when pressed
Try in this order
0 of 4 completedRemove the transport bolts
ReversibleRemove the transport bolts from the back, and follow the installation section, and then test again to see whether it helped.
Press each corner
ReversiblePress each corner, and check that there is no give and no wobble, and then test again to see whether it helped.
Adjust the feet
ReversibleAdjust the feet, by lifting the washer slightly and turning the gray plastic foot down as needed.
Lock the locknuts
ReversibleLock the locknuts, by tightening them against the bottom without changing the foot height, and then test again to see whether it helped.
Model-specific
What is true of this model and not of its siblings
- Foot adjustment procedure
- Have someone lift up the washer slightly to take pressure off the foot to be adjusted, turn the gray plastic foot downward as far as needed to raise that corner the correct amount, recheck by pressing each corner, and lock each adjusted foot with its locknut, holding the foot so the height does not change. All four feet should press equally against the floor.
- Unbalanced load messages
- E:32 alternating with END is not a fault: the unbalanced load detection interrupted the spin because the laundry is unevenly distributed. Distribute the items evenly and start an additional spin program. Repeated spinning with the Wash indicator flashing is the system trying to balance the load, which mixing sizes prevents.
- Transport bolts
- The transport bolts secure the drum during shipping and must be removed before the first wash; Bosch's troubleshooting table asks whether they were removed and points to the installation page for removing them. Keep them, because moving the washer without them can damage it. A washer that shakes hard from the very first cycle has almost always still got its bolts in.
- Parts for this problem on the WAT28400 (RepairClinic, 2026-09-20)
- shock absorber, part number 00742719, at $60.40; spring-tank, part number 00629930, at $4.44; leveling leg, part number 00610643, at $13.90.
- Other models this page answers
- These steps also fit the 300 Series WGA12400UC washer, 800 Series WAW285H2UC washer, 800 Series WGB24600UC washer.
Stop boundary
When this stops being a self-service repair
- !If the washer keeps walking after levelling and removing the bolts, call Bosch customer service
- !If the drum hits the housing, stop using it
Evidence ledger
Sources behind this answer
Bosch's own US owner-support pages for washer error codes and self-help.
Parts and list prices as shown on RepairClinic's parts search for this model number on 2026-09-20.
Exact questions
Common questions
Why does my Bosch shake at high spin?+
The suspension shifts as speed increases; mixed loads minimize it.
How do I check the washer is level?+
Press each corner of the top; there should be no give.
What are locknuts for?+
They lock each foot against the bottom of the washer.
Are transport bolts still needed?+
No; remove them; keep them for moving.
Can the floor cause shaking?+
Yes; a soft floor increases vibration.