Standing water in the tub
There is visible dirty water around the filter area or covering the bottom after the cycle stops.
Start here: Start with the filter, sump opening, and the drain hose path to the sink or disposal connection.
Dishwasher not draining
Frigidaire Dishwasher i20 Code
Direct answer: A Frigidaire dishwasher i20 code usually means the machine is not draining properly or not sensing a normal drain-out. Most of the time the cause is a clogged dishwasher filter, debris in the sump area, a blocked sink air gap, or a kinked or restricted dishwasher drain hose.
Most likely: Start with any standing water in the tub, then clean the dishwasher filter and check the full drain path to the sink connection. Those are the highest-hit fixes by a wide margin.
If the tub has water sitting in the bottom and the cycle stops with i20, treat it like a drain restriction first. Reality check: this code often shows up after the machine has been washing normally for a while, then suddenly leaves a dirty inch of water behind. Common wrong move: running cycle after cycle without clearing the filter just packs more debris into the drain path.
Don’t start with: Do not start by ordering a dishwasher drain pump or control part. On this code, blockages and hose issues are much more common than a failed internal component.
If you see water in the bottomGo straight to the filter, sump opening, and drain hose checks.
If the tub is mostly empty but the code returnsLook for a partial blockage, air gap clog, or a weak drain pump that hums but does not move water well.
Last reviewed: 2026-04-17
What the i20 code usually looks like in the kitchen
Code appears near the end of the cycle
The dishwasher washes, then throws i20 when it should be draining out.
Start here: Look for a partial blockage that lets some water through but not enough fast enough.
Humming or buzzing during drain
You hear the machine trying to drain, but the water level barely drops.
Start here: Check for debris jammed in the sump or drain pump area before assuming the pump is bad.
Tub looks mostly empty but code keeps coming back
Only a thin puddle or damp bottom is left, yet the dishwasher still faults.
Start here: Check the air gap, sink drain connection, and hose routing for a slow restriction or backflow issue.
Most likely causes
1. Clogged dishwasher filter or sump debris
Food scraps, glass bits, labels, and grease slow the drain enough to trigger i20. This is the most common cause.
Quick check: Remove the lower rack, unlock the dishwasher filter, and look for sludge or hard debris around the sump opening.
2. Blocked sink air gap or sink-side drain connection
If the dishwasher drains into an air gap or disposal inlet, that small passage can clog and back up the dishwasher.
Quick check: Pop the air gap cap if you have one and check for gunk. If there is no air gap, inspect the hose connection under the sink for buildup.
3. Kinked, sagging, or restricted dishwasher drain hose
A hose pinched behind the machine or packed with grease can let a little water through but not enough to clear the tub on time.
Quick check: Look under the sink first, then as far back as you can behind the dishwasher, for sharp bends, low sags, or a hose full of sludge.
4. Dishwasher drain pump jammed or weak
If the drain path is clear and the pump only hums, drains very slowly, or stops intermittently, the pump may be failing.
Quick check: After clearing the filter and hose path, run a drain cycle and listen for a strong rush of water versus a weak hum or chattering sound.
Step-by-step fix
Step 1: Confirm whether this is a real drain problem or a false alarm
You want to separate a full no-drain from a partial drain right away. That tells you whether to focus on a clog, a hose issue, or a weaker pump.
- Cancel the cycle and open the dishwasher after the drain attempt stops.
- Look at the bottom of the tub around the filter area.
- If water is above the filter plate or clearly pooled across the bottom, treat it as a real drain restriction.
- If the tub is nearly empty, note whether the code happens every cycle or only sometimes.
Next move: You now know which path to follow: obvious standing water means start with blockages; a mostly empty tub points more toward a partial restriction or weak pump. If you cannot tell because the water is cloudy or the machine keeps restarting, scoop enough water out with a cup so you can inspect the bottom clearly.
What to conclude: A lot of water left behind usually means the drain path is blocked. Very little water left with repeated i20 usually means the machine is draining, just not well enough or not consistently enough.
Stop if:
- Water is leaking onto the floor from under the dishwasher.
- You smell burning, see smoke, or hear harsh grinding instead of a normal drain sound.
Step 2: Clean the dishwasher filter and clear the sump opening
This is the highest-probability fix and the least destructive place to start. A dirty filter or debris at the sump can slow drainage enough to trip the code.
- Turn off power to the dishwasher or switch it off at the breaker before putting hands into the sump area.
- Remove the lower rack.
- Unlock and lift out the dishwasher filter assembly.
- Rinse the filter with warm water and mild dish soap. Use a soft brush only if needed.
- Look into the sump opening for labels, broken glass, bone fragments, seeds, or grease buildup and remove what you can reach safely.
- Wipe the area clean and reinstall the dishwasher filter securely.
Next move: Run a rinse or cancel-drain cycle. If the water leaves quickly and the code stays gone, the blockage was at the filter or sump. Move to the sink-side drain path next. A clean filter with the same code usually means the restriction is farther downstream.
What to conclude: If cleaning the filter changes the sound of the drain or improves it even a little, you were on the right track and should keep following the drain path before suspecting parts.
Step 3: Check the air gap and sink-side drain connection
A dishwasher can have a perfectly clean filter and still throw i20 because the clog is at the sink end. This is especially common when the sink drains slowly too.
- If your sink has an air gap on the countertop, remove the cap and clean out any sludge or food debris inside.
- Run water at the sink and make sure the sink itself is draining normally.
- Inspect where the dishwasher drain hose connects under the sink.
- If it connects to a garbage disposal, make sure the disposal is clear and the dishwasher inlet is not packed with debris.
- If the dishwasher was newly installed and has never drained right, confirm the disposal knockout was removed.
Next move: If cleaning the air gap or sink connection restores a strong drain, the dishwasher itself was probably fine. Go on to the dishwasher drain hose routing and blockage check.
Step 4: Inspect the dishwasher drain hose for kinks, sags, or internal blockage
A partially collapsed or grease-packed dishwasher drain hose is a classic i20 cause. It can pass some water, then stall out when the machine needs a full drain.
- Turn power off to the dishwasher before moving it or reaching behind it.
- Check the visible hose under the sink for sharp bends, crushing, or a low sag that can trap debris.
- Make sure the hose rises in a high loop under the counter if there is no air gap.
- If access allows, pull the dishwasher forward carefully and inspect the hose behind the machine for pinching.
- If the hose was kinked for a long time or feels packed with sludge, remove and flush it out or replace it if it is brittle, split, or will not clear.
Next move: A corrected hose route or cleared hose should give you a stronger, faster drain and stop the code. If the hose path is clear and the machine still drains weakly, the drain pump becomes the main suspect.
Step 5: Listen to the drain pump and decide whether to repair or call it
Once the filter, sump, air gap, and hose path are clear, a weak or jammed dishwasher drain pump is the next honest call. This is where you stop guessing.
- Restore power and run a drain or cancel cycle.
- Listen for a strong, steady pump sound with a solid rush of water into the sink drain.
- If you hear only a hum, intermittent chatter, or a weak trickle with a confirmed clear drain path, the dishwasher drain pump is likely failing or jammed internally.
- If the dishwasher now drains normally, run a full short cycle to confirm the code does not return.
- If the machine still shows i20 after all drain-path checks and you are not comfortable opening the lower pump area, schedule service and report that the external drain path has already been cleared.
A good result: If the dishwasher drains hard and finishes a full cycle, you are done. Keep an eye on it for the next few loads.
If not: If the pump sound is weak with a clear path, plan on a dishwasher drain pump repair. If the diagnosis is still muddy, a service tech can confirm pump output and internal blockage quickly.
What to conclude: At this point, repeated i20 with a clear drain path usually comes down to the dishwasher drain pump or a less common internal issue that is not worth guessing at from the outside.
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FAQ
What does i20 mean on a Frigidaire dishwasher?
It usually means the dishwasher is not draining properly or is taking too long to drain. In plain terms, the machine expected the water to leave and it did not happen fast enough.
Can a dirty filter really cause an i20 code?
Yes. A dirty dishwasher filter is one of the most common causes. Even a partial clog can slow the drain enough to trigger the code near the end of the cycle.
Why does my dishwasher show i20 even when there is barely any water left?
That usually points to a partial restriction, a sink-side clog, poor hose routing, or a weak drain pump. The machine may be draining some water, just not enough or not fast enough.
Should I replace the drain pump right away for an i20 code?
No. Start with the filter, sump opening, air gap, sink connection, and dishwasher drain hose first. Those are more common than a failed pump and much cheaper to fix.
Can a garbage disposal cause a dishwasher i20 code?
Yes. A clogged disposal inlet or an unremoved knockout on a newer installation can block dishwasher drainage and trigger the code.
How do I know if the dishwasher drain pump is bad?
If the full drain path is clear and the pump only hums, chatters, or moves water weakly during a drain cycle, the dishwasher drain pump becomes the likely culprit.