Simpson Dishwasher Error i20
⚡ Quick Answer: The i20 error code on your Simpson dishwasher indicates a drainage issue. This often results in the dishwasher stopping mid-cycle or having standing w... ✅ DIY Fixable
What Does Error i20 Mean?
The i20 error code on your Simpson dishwasher indicates a drainage issue. This often results in the dishwasher stopping mid-cycle or having standing water in the tub after a cycle. Unusual sounds from the pump may also occur. The primary causes include a clogged drainage pathway or an incorrectly installed drain hose. To resolve this, check and clear the drainage system, including the filter and sump area.
Common Symptoms:
- Dishwasher stops mid‑cycle or at end
- Standing water inside dishwasher tub after cycle
- Dishwasher displays error and may beep repeatedly
Possible Causes
- Clogged or obstructed drainage pathway (medium)
- Incorrect drain hose installation or blockage at sink drain/knockout plug (medium)
How to Fix Error i20
DIY Fix Check and clear dishwasher drainage
- Turn off the dishwasher and disconnect power
- Remove bottom rack and locate dishwasher filter
- Clean food debris and residues from filter and sump area
- Trace the drain hose under sink to check for kinks or blockages
- If an air gap is installed, remove and clean it
Technician Only Inspect and service drain components
- Verify correct drain hose routing and height according to installation guidelines
- Inspect and clear any obstructions at the sink drain trap (remove knockout plug if present)
- Test drain pump operation and impeller movement
- Replace drain pump if it fails electrical and functional tests
Parts needed: Drain hose, Filter assembly, Drain pump
- Water remains standing after clearing filter and hose
- Unusual noises from drain pump
- Error persists after cleaning and basic checks
Next step
Choose the next step for i20
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 Hose
Carries waste water from the drain pump to your home's standpipe or sink drain.
- Typical part-only price
- $15 - $30
- 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 components that may be involved
Check these only if your diagnosis points to them.
Drain Pump
Pumps waste water out of the appliance during the drain cycle.
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Technical Specifications
| wattage | 60W |
|---|---|
| component | Drain Pump |
| resistance | 10-20 ohms |
| part_number | SP123456 |
| voltage_rating | 240V AC |
Common Questions
What does i20 error mean on Simpson dishwasher?
The i20 error indicates a drainage problem, typically stopping the cycle with standing water inside.
Can I fix Simpson dishwasher i20 error myself?
Yes, you can check and clear the dishwasher's drainage system, including the filter and hose.
How much does it cost to fix i20 error?
The estimated repair cost for the i20 error ranges from $150 to $350, depending on parts and region.
When should I call a technician for i20?
Call a technician if water remains after clearing the filter, you hear unusual noises, or if the error persists.
Sources & References
Data last verified: 2026-04-23
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