Possible causes of error SUD or Sd:

• Too much detergent: 
  • Using more detergent than recommended, especially with HE detergents in non-HE washers, can create excessive suds.
• Improper detergent type: 
  • Using non-HE detergent in an HE washer can lead to excessive suds, as HE detergents are formulated to produce fewer suds.
• Clogged dispenser: 
  • A clogged dispenser drawer can prevent detergent from dissolving properly, leading to suds buildup.
• Faulty dispenser: 
  • A malfunctioning dispenser might continuously release too much detergent, causing suds issues.
• Faulty suds sensor: 
  • If the sensor malfunctioning, it may not accurately detect suds levels, triggering the error even with normal suds.

Troubleshooting the SUD or Sd error code in Whirlpool Washing Machine

1. Open the door cautiously: 
   • If the cycle is paused, carefully open the door and check for excessive suds. Don't touch any electrical components.
2. Reduce suds if possible: 
   • If there are excessive suds, use a ladle or scoop to skim some out carefully. Be cautious not to overflow the drain hose.
3. Restart the cycle: 
   • Once you've removed some suds, close the door and press "Start/Pause" to attempt restarting the cycle.
4. Check detergent usage: 
   • Ensure you're using the correct amount and type of detergent for your washer and load size. Refer to your user manual and detergent packaging for guidance.
5. Clean the dispenser: 
   • Remove the dispenser drawer and clean it thoroughly according to your user manual, removing any built-up detergent residue.
6. Reset the washer: 
   • Unplug the washer for a few minutes, then plug it back in and restart the cycle. This can sometimes clear minor glitches.
7. Consult your user manual: 
   • Each model might have specific troubleshooting steps or additional error code explanations related to SUD/Sd. Check your manual for further instructions.

Seeking professional help:

• If the error persists after trying these steps, contact Whirlpool support or a qualified appliance repair technician. They can diagnose the root cause, whether it's a faulty dispenser, sensor issue, or another internal problem, and recommend the necessary repairs.

Additional points:

• The SUD/Sd error code might appear in combination with other codes, providing further clues. Consult your manual for combined code meanings.
• Depending on your model and age, troubleshooting specifics or repair needs might vary.
• If your washer is under warranty, contacting Whirlpool support before any repairs is recommended.

Remember, safety is crucial. If you're not comfortable dealing with water or electrical components, always seek professional help.