Westinghouse Dishwasher Error i40
⚡ Quick Answer: The Westinghouse Dishwasher error i40 signals a drainage issue, typically caused by a blockage in the drainage system. This results in water not drain... ✅ DIY Fixable
What Does Error i40 Mean?
The Westinghouse Dishwasher error i40 signals a drainage issue, typically caused by a blockage in the drainage system. This results in water not draining properly, causing the dishwasher cycle to fail and potentially leading to water pooling inside the unit. Common culprits include clogged filters, sump areas, or hoses. Addressing these issues promptly can restore proper function and prevent further complications.
Common Symptoms:
- Dishwasher displays i40 or .40 code
- Cycle fails to complete and water remains in unit
- Possible water pooling or slow/failed drainage
Possible Causes
- Drainage blockage (filter/sump/clogged hose) (medium)
- Pressure sensor or water level control fault (low)
How to Fix Error i40
DIY Fix Check and clean dishwasher filters and drain path
- Turn off and unplug the dishwasher or switch off at the breaker for safety.
- Remove and clean the filter(s) at the bottom of the dishwasher.
- Check and clear the sump area of food debris or foreign objects.
- Inspect the drain hose for kinks or blockages; clear if necessary.
- Reconnect and run a short drain/rinse cycle to see if the code clears.
Technician Only Inspect drain pump and sensors
- Verify continuity and operation of the drain pump; clear any blockage at the impeller.
- Test the pressure sensor / water level switch for proper operation.
- Check wiring harness connections for corrosion or disconnection.
- If components fail diagnostics, replace drain pump or pressure sensor as appropriate.
Parts needed: Drain pump assembly, Pressure sensor / water level switch, Hoses and clamps
- If the error persists after cleaning filters and hoses
- If water remains in the dishwasher despite drainage attempts
- If diagnostic testing shows failed pump or sensor components
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.
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 components that may be involved
Check these only if your diagnosis points to them.
Pressure Switch
Detects the water level inside the tub and signals when to start or stop filling.
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Technical Specifications
| wattage | 50W |
|---|---|
| component | Drain Pump |
| resistance | 10-20 ohms |
| part_number | WDW-12345 |
| voltage_rating | 120V AC |
Common Questions
What does i40 error mean on Westinghouse Dishwasher?
The i40 error indicates a drainage problem, often leading to water not draining properly.
Can I fix Westinghouse Dishwasher i40 error myself?
Yes, you can check and clean filters and the drain path to resolve the issue.
How much does it cost to fix i40 error?
Repair costs range from $50 to $200+, depending on parts and labor.
When should I call a technician for i40?
Call a technician if the error persists after cleaning or if water remains in the dishwasher.
Sources & References
Data last verified: 2026-07-22
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