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FRIGIDAIRE i40

Frigidaire Dishwasher Error i40: Filter or Sump Is Clogged

Clear meaning, realistic next steps, and safe guidance without turning the page into a long repair manual.

What it means

Frigidaire dishwasher error i40 usually means water flow through the filter or sump area is restricted.

Severity

Low - usually safe to check with basic user-accessible cleaning or inspection on the Frigidaire dishwasher.

Can you fix it yourself?

Yes — DIY-safe

Most likely cause

Food debris and grease coating the cylindrical filter and the flat glass trap beneath it

Estimated time for safe first checks: 10–20 min.

Step-by-Step DIY Fix Guide

  1. SAFETY: Turn off power at the breaker before reaching into the sump area.
  2. Remove the lower rack and take out both the cylindrical filter and the flat trap beneath it.
  3. Rinse both pieces thoroughly and scrub away grease, food debris, or visible buildup.
  4. Inspect the sump opening for hard debris, glass, or trapped scraps before reinstalling the filter.
  5. Lock the filter back into place properly and run a short cycle to confirm whether i40 clears.

If i40 returns after a full filter clean

  • If the filter is clean but the code returns immediately, inspect the sump again for small hard debris.
  • If the filter assembly is damaged or torn, it may need replacement rather than repeated cleaning.
  • If wash performance is poor and i40 keeps returning, deeper circulation blockage may need service.

What This Error Means

Frigidaire dishwasher error i40 means water flow through the filter and sump area is restricted. In most cases this is a maintenance problem, not a failed control board or major internal part.

The filter and glass trap at the bottom of the tub are the first things to clean. Food debris, grease, and hard-water buildup are still the most common cause of i40.

If the filter is clean and the code comes straight back, the next likely issue is trapped debris in the sump or a damaged filter assembly.

Most Likely Cause by Symptom

Wash performance drops and the filter area looks dirty or greasy.

Likely cause: The filter or sump path is restricting circulation.

Check first: Remove and clean the full filter and trap assembly.

The code returns right after a quick rinse of the filter.

Likely cause: Debris or scale is still trapped deeper in the filter or sump.

Check first: Do a full scrub of the filter parts and inspect the sump opening carefully.

Common Causes

  • The cylindrical filter and glass trap are coated with grease and debris.
  • Mineral scale is restricting flow through the filter mesh.
  • Small objects are lodged in the sump below the filter assembly.
  • The filter was reinstalled loosely after cleaning.
  • The filter mesh or trap is damaged and no longer directing flow correctly.

What Not to Do

  • Do not reinstall the filter loosely after cleaning it.
  • Do not use abrasive tools that can tear the filter mesh.

Model and Display Variation Notes

Model-family notes

  • Frigidaire dishwasher filter and trap layouts vary by model family, but the tub-floor filter path is still the first place to start.
  • Kitchen plumbing changes are especially relevant on i20 because hose routing and disposal setup matter as much as the dishwasher itself.

Display and panel differences

  • Panel wording can vary by series, so confirm the exact code pattern before buying parts.

Parts, Tools and Service Options

Common parts

  • Filter assembly if the mesh is torn or warped ($15–$35)
  • Circulation pump if impeller is blocked or damaged ($60–$130)

Manual and model check

Check your exact model before ordering any dishwasher parts.

Service option

Service visit if the code returns after the accessible filter and drain checks are complete.

Suggestions in this section are organized to support the troubleshooting flow first. Any future affiliate relationships should be disclosed clearly.

When Not to Keep Troubleshooting

i40 returns immediately after a full cleaning of the filter and sump area.

  • The filter mesh is torn or the trap is cracked.
  • You suspect deeper sump or circulation blockage that is not accessible from the tub floor.

How to Prevent It Recurring

  • Clean the filter and glass trap once a month — pre-rinsing dishes is not required, but scraping large food pieces off plates before loading significantly reduces filter clogging

Related Error Codes

Extra notes

  • This page is based on Frigidaire support material and stays conservative where model-specific guidance may vary.
  • The goal is to help you identify safe first checks before you move into parts, service, or model-specific manual lookup.

Source and model notes

Last reviewed: 2026-04-09

Based on: Based on Frigidaire dishwasher filter and sump restriction guidance and edited to prioritize full filter maintenance before deeper circulation work.

View Frigidaire US Official Support

Model coverage note: Filter, trap, and drain-path layouts vary by Frigidaire dishwasher family, so use this page as a practical first-pass guide rather than a model-specific repair procedure.

Important: FixThisError is an independent guide, not the manufacturer. Use your model-specific manual when the panel wording or behavior differs.

Always disconnect power before inspecting appliances. If unsure, contact a licensed appliance technician.