Frigidaire · Dishwasher
Frigidaire Dishwasher i40 Error Code
Drain restriction or slow pump-out
What this error means
i40 indicates water could not drain within the timeout—same family as i20 with a secondary drain fault flag.
How I40 is detected
When I40 appears on a Frigidaire dishwasher, the control board has confirmed that water did not leave the machine within the programmed drain window. On Frigidaire FGID2479SF, Frigidaire FDPH4316AS, and similar variants, the drain pump runs for a fixed interval—often three to seven minutes on washers and dishwashers—while a pressure switch or turbidity sensor verifies the tub or sump is empty. If water remains, the cycle stops to prevent spin with a full tub or overflow on the next fill.
Most I40 calls are resolved without parts: remove and rinse the glass trap and fine filter. Restricted drain paths mimic pump failure because the impeller spins against a blocked hose or filter. Document whether the pump hums audibly during the drain step; a humming pump with no water movement points to a clogged filter or kinked hose, while silence may indicate a failed pump motor or loose wiring at the harness.
After clearing blockages, run a short cycle and listen at the drain hose for steady water flow. If I40 returns on the next load with a clean filter and straight hose, measure resistance at the pump motor connector per the service manual for your model before ordering a replacement pump assembly.
Common causes
- Glass trap and filter clogged
- Kinked drain hose
- Blocked air gap at sink
- Garbage disposal knockout plug still in place
Step-by-step fixes
- 1Remove and rinse the glass trap and fine filter
- 2Verify drain hose has high loop or air gap
- 3Run disposal to clear shared drain
- 4Start a cancel-drain and listen for pump hum
When to call a technician
i40 with clear path and humming pump needs drain pump motor.
Affected models
- Frigidaire FGID2479SF
- Frigidaire FDPH4316AS
- Frigidaire FFCD2413US
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use dishwashers to prevent I40 from lint and food debris buildup.
- Record when I40 appears in the cycle and whether it clears after a 60-second power reset on your Frigidaire dishwasher—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for I40; Frigidaire uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting I40; reversed plugs on pumps and valves cause immediate repeat faults.