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
- Turn off and unplug the washing machine.
- Inspect the external drain hose for kinks or bends and straighten if necessary.
- Detach the drain hose and flush it with water to clear any debris.
- Reattach the hose securely and ensure correct height/positioning per installation manual.
DIY Fix Clean drain pump filter and check for obstructions
- Unplug the machine and locate the drain pump filter access panel (usually at front/bottom).
- Place a shallow tray to catch water and slowly unscrew the filter cap.
- Remove debris, lint, small objects from filter and pump housing.
- Replace the filter, close panel, and test a short drain/spin cycle.
Technician Only Test and replace drain pump if necessary
- Disconnect power and drain hoses.
- Remove rear or bottom panel to access the drain pump.
- Measure electrical resistance of pump motor windings to determine if within specification.
- Replace pump if defective or if impeller is seized/damaged.
- Reassemble and verify drainage operation.
Parts needed: Drain pump assembly
- 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.
Next step
Choose the next step for E21
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Most relevant component to inspect
Drain Pump
Pumps waste water out of the appliance during the drain cycle.
- Typical part-only price
- $35 - $80
- DIY difficulty
- Easy
- Estimated time
- 15-30 mins
Where can I find the model number?
Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.
Verify the complete model and part number on the retailer's compatibility page before ordering.
Other parts options
Check related components first; use model search as a fallback.
Model-compatible Washing Machine parts
Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.
Optional routine care
Maintenance supplies
These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.
Washing Machine Cleaner Tablets
Routine tub-cleaning supplies for residue and odor control. They do not repair a mechanical, drainage, or electronic fault.
Braided Washer Inlet Hoses
A maintenance replacement option for visibly worn external fill hoses. Verify thread size, length, and hot/cold connection requirements.
Washer Drain Hose Holder
Helps secure an external drain hose at the standpipe. It does not correct an internal pump or control fault.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.
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: 2026-07-22
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