i40: Clogged filter/sump or drain restriction (i40)
- Clogged Glass Trap/Filter
- Drain Line Restriction
The Tools to Test + Fix With
You don't need a shop full of tools — you need these. The multimeter is the one that pays for itself the first time it stops you buying the wrong part on a fault code.
Digital multimeter
Test a suspect part for continuity BEFORE you buy — the single best way to avoid replacing the wrong thing on a fault code.
🔎 On Amazon →Nut driver set (¼" + 5⁄16")
Most appliance panels are held on with ¼" and 5⁄16" hex screws.
🔎 On Amazon →Screwdriver set (Phillips/flat/Torx)
Covers the odd panel screw and the Torx fasteners many brands use.
🔎 On Amazon →The Fix — Free Checks First, Then the Part
Work top-down: the free checks before you spend a dime, and test to confirm the part is actually bad before you buy. When it is a part, you get both options — the genuine OEM part sourced through us and shipped to your door, or a budget aftermarket part on Amazon. Your call.
No part — clean filter, sump & hose
Rinse the filter, scoop the sump, straighten the drain hose, and confirm a new disposal's knockout plug was removed. Clears most i40 codes.
✅ No part needed — try this firstDrain pump
If the filter, sump, and hose are clear but it still won't drain. Match your model.
Prices shown are typical aftermarket ranges and vary by brand and model — genuine OEM is priced by quote when you request it. Amazon links open a search so you can match your exact model number; as an Amazon Associate, Appliance Ant may earn from qualifying purchases at no extra cost to you. Always confirm the part fits your model.
Safe to Try · Know the Risk · Call a Pro
General guidance, not professional advice. Always unplug the appliance (or shut off the gas/water) before you check anything. If it feels beyond you, that's exactly when to get a pro.
✅ Safe to try yourself
- Remove the bottom rack, rinse the filter, and scoop the sump.
- Check the drain hose for kinks and clogs.
- Confirm a newly-installed disposal's knockout plug was removed.
⚠️ Doable — know the risk
- Drain pump replacement — moderate; cut power and shut the water off.
🛑 Call a pro — don't touch this
- A leak reaching the wiring/control under the tub.
The Honest Call
Usually free — i40 is a restriction. Only a drain pump ($30–80) is a real spend, still under a new dishwasher.
In Middle Tennessee or Louisiana?
Don't want to DIY it? Our own family of technicians will come clear that i40 for you — honest flat pricing, usually same-day, 4.5★ from 1,000+ neighbors.
🔧 Get it fixed by our techs →