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

  1. Turn off the dishwasher and disconnect power
  2. Remove bottom rack and locate dishwasher filter
  3. Clean food debris and residues from filter and sump area
  4. Trace the drain hose under sink to check for kinks or blockages
  5. If an air gap is installed, remove and clean it

Technician Only Inspect and service drain components

  1. Verify correct drain hose routing and height according to installation guidelines
  2. Inspect and clear any obstructions at the sink drain trap (remove knockout plug if present)
  3. Test drain pump operation and impeller movement
  4. Replace drain pump if it fails electrical and functional tests

Parts needed: Drain hose, Filter assembly, Drain pump

🛑 When to Call a Pro:
  • Water remains standing after clearing filter and hose
  • Unusual noises from drain pump
  • Error persists after cleaning and basic checks

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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