Simpson Washing Machine Error E21

⚡ Quick Answer: The Simpson Washing Machine error E21 indicates a drainage issue, typically when the machine fails to drain water during a cycle. Symptoms include the... ✅ DIY Fixable

What Does Error E21 Mean?

The Simpson Washing Machine error E21 indicates a drainage issue, typically when the machine fails to drain water during a cycle. Symptoms include the display of the E21 code, water remaining in the drum after the drain cycle, and the cycle stopping due to un-drained water. Common causes are a blocked or kinked drain hose, a clogged drain pump filter, or a faulty drain pump. Immediate attention to these issues can resolve the problem and restore proper function.

Common Symptoms:

  • Machine displays E21 in service/diagnostic menu
  • Water remains in drum after drain cycle
  • Cycle stops or does not proceed due to un‑drained water

Possible Causes

  • Blocked or kinked drain hose (high)
  • Clogged drain pump filter or foreign object in pump (high)
  • Faulty drain pump (medium)

How to Fix Error E21

DIY Fix Check and clear drain hose/blockages

  1. Turn off and unplug the washing machine.
  2. Inspect the external drain hose for kinks or bends and straighten if necessary.
  3. Detach the drain hose and flush it with water to clear any debris.
  4. Reattach the hose securely and ensure correct height/positioning per installation manual.

DIY Fix Clean drain pump filter and check for obstructions

  1. Unplug the machine and locate the drain pump filter access panel (usually at front/bottom).
  2. Place a shallow tray to catch water and slowly unscrew the filter cap.
  3. Remove debris, lint, small objects from filter and pump housing.
  4. Replace the filter, close panel, and test a short drain/spin cycle.

Technician Only Test and replace drain pump if necessary

  1. Disconnect power and drain hoses.
  2. Remove rear or bottom panel to access the drain pump.
  3. Measure electrical resistance of pump motor windings to determine if within specification.
  4. Replace pump if defective or if impeller is seized/damaged.
  5. Reassemble and verify drainage operation.

Parts needed: Drain pump assembly

🛑 When to Call a Pro:
  • If water leakage occurs during inspection or cleaning.
  • If after clearing hoses and filter the error persists.
  • If electrical diagnostics (pump testing) are outside user capability.

Technical Specifications

wattage 120W
component Drain Pump
resistance 5-15 ohms
part_number Simpson 421300
voltage_rating 240V AC

Common Questions

What does E21 error mean on Simpson Washing Machine?

E21 indicates a drainage issue where the machine fails to drain water during a cycle.

Can I fix Simpson Washing Machine E21 error myself?

Yes, you can check and clear the drain hose and clean the drain pump filter.

How much does it cost to fix E21 error?

Repair costs range from AUD 80 to 250 for parts, excluding labor.

When should I call a technician for E21?

Call a technician if the error persists after basic troubleshooting or if you notice water leakage.

Data last verified: 2026-04-23

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