What causes the Sud code on a Whirlpool washer?

Too much detergent: Over-dosing creates foam the washer must clear. Non-HE detergent: Standard detergent in an HE washer over-suds badly.

Whirlpool · Washer Minor

Sud — / Sd — Excess Suds Detected

Sud (Sd) means the washer sensed too many suds and paused to let them clear. It often appears just before an F21 drain code because foam slows draining.

Keep using it?: Yes — fix when convenient
DIY difficulty: Easy
Typical cost: $10-20
Verified against: producthelp.whirlpool.com ↗

The fix

HE detergent

Excessive suds detected

$10-20 easy difficulty 5 min

Diagnose first: Usually caused by using regular (non-HE) detergent or too much HE detergent. Run a tub clean cycle to clear residual suds before next wash.

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How to fix it

Let the washer run its suds-reduction routine.
Use far less detergent (HE machines need about a tablespoon).
Switch to HE detergent.
Run an extra rinse to clear foam.

Why it happens

Typical signs: Cycle pauses and extends · Foam in the drum · Sud/Sd, sometimes followed by F21

Too much detergent Over-dosing creates foam the washer must clear.
Non-HE detergent Standard detergent in an HE washer over-suds badly.

Other parts sometimes needed

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

HE Washing Machine Detergent Common replacement
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More Whirlpool washer codes

dET dET — Detergent Cartridge Empty F0E2 F0E2 — Over Suds Detected F0E3 F0E3 — Load Too Heavy / Basket Blocked F0E5 F0E5 — Off-Balance Load F0E7 F0E7 — Motor Control Unit Fault F1E1 F1E1 — Main Control Board (CCU) Fault

All Whirlpool codes → All washer codes →

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: producthelp.whirlpool.com.