Simpson Dishwasher Error i40

⚡ Quick Answer: The Simpson dishwasher error code i40 signals a water leakage detection issue, often leading to a continuous beeping sound and flashing display lights... ✅ DIY Fixable

What Does Error i40 Mean?

The Simpson dishwasher error code i40 signals a water leakage detection issue, often leading to a continuous beeping sound and flashing display lights. This error typically indicates problems with the water level or pressure sensing, potentially caused by a blockage in the drainage path or faulty sensors. Users may notice that the dishwasher stops functioning and fails to complete cycles, often due to incorrect water level detection or drainage issues.

Common Symptoms:

  • Dishwasher stops and displays i40 instead of completing cycle
  • Possible failure to drain or incorrect water level detection

Possible Causes

  • Pressure sensor / water level sensor fault or blockage (medium)
  • Clogged filters or sump affecting water flow (medium)

How to Fix Error i40

DIY Fix Clean filters and check for visible blockages

  1. Turn off and unplug the dishwasher.
  2. Remove and clean all filters according to the user manual.
  3. Inspect the sump area for debris and remove any obvious blockages.
  4. Reassemble and power on to see if error clears.

DIY Fix Check drainage hose and connections

  1. Locate the drain hose behind the dishwasher.
  2. Ensure there are no kinks, sharp bends, or visible debris.
  3. If possible, flush with water to clear potential blockages.
  4. Reconnect securely and test operation.

Technician Only Inspect and test pressure/water level sensor

  1. Remove dishwasher access panel and locate the pressure sensor and hose.
  2. Disconnect and clean the pressure hose and sensor ports.
  3. Use diagnostic tools to test sensor function and electrical continuity.
  4. Replace sensor if faulty.

Parts needed: pressure sensor, pressure hose

🛑 When to Call a Pro:
  • If the i40 error persists after cleaning filters, checking hoses, and basic user‑level troubleshooting
  • If water leakage or electrical faults are suspected

Next step

Choose the next step for i40

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Check during diagnosis

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.

Find a part that fits my model

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.

Possible related component

Pressure Switch

Detects the water level inside the tub and signals when to start or stop filling.

$25 - $65 · Easy · 15-30 mins

Check fit & price
Possible related component

Door Gasket

Creates a watertight seal around the door to prevent leaks during operation.

$45 - $110 · Medium · 30-60 mins

Check fit & price

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.

Technical Specifications

wattage 1800W
component Leakage Sensor
resistance 5-10 ohms
part_number Simpson 123456789
voltage_rating 240V AC

Common Questions

What does i40 error mean on Simpson dishwasher?

The i40 error indicates a water leakage detection issue, stopping the dishwasher from completing its cycle.

Can I fix Simpson dishwasher i40 error myself?

Yes, you can clean filters and check for blockages in the drainage hose.

How much does it cost to fix i40 error?

Repair costs for the i40 error typically range from AUD $100 to $300 for sensor replacement.

When should I call a technician for i40?

Call a technician if the i40 error persists after cleaning or if you suspect water leakage or electrical faults.

Sources & References

Data last verified: 2026-04-23

User Comments (0)

Share your experience or solution below.

Be the first to comment!