Frigidaire Dishwasher I20 Error Code: What It Means & What to Check

Q: My Frigidaire dishwasher is showing I20. What does that mean, and what should I do?

A: On many Frigidaire dishwashers, I20 usually means the dishwasher did not drain completely. In simple terms, the control expected the water to pump out, but it sensed that water remained in the tub (or the drain process took too long).

Sometimes the fix is simple—like clearing the filter, checking for a kinked drain hose, or cleaning a blockage at the sink connection. If the code returns after those checks, a drain pump, wiring issue, or control problem may be involved. Our friendly technicians in yellow can help diagnose it safely.

What the Frigidaire Dishwasher I20 Code Usually Means

The I20 code typically points to a drain problem. Common causes include:

• Clogged filter or sump area
• Blocked or kinked drain hose
• Sink drain / garbage disposal connection blockage
• Drain pump issue
• Wiring or control issue affecting drain operation

Common Symptoms You May Notice

• Dishwasher stops and shows I20
• Standing water left in the bottom of the tub
• Cycle ends early or won’t complete
• Humming sound during drain but little/no water movement
• Slow draining or repeat drain-related codes

Safety First (Before You Start)

Drain issues are often safe to inspect at a basic level, but use care around water and electricity:

• Turn off power to the dishwasher before hands-on cleaning or inspection
• Be careful of sharp edges around filters, screens, and sump areas
• Place towels down before disconnecting any drain hose connection (water may spill)
• Do not force parts or disassemble internal components beyond basic homeowner cleaning

Quick Checks You Can Try at Home

These homeowner-safe checks often resolve a Frigidaire dishwasher I20 code.

1) Cancel/Drain the Cycle and Listen

Start by running a Cancel/Drain (if your model has it) and listen to what the dishwasher does.

• Normal drain sound + water leaving: may have been a temporary interruption
• Humming but no drain: possible blockage or pump issue
• No drain sound at all: possible pump, wiring, or control issue

2) Clean the Filter and Check for Debris

A partially blocked filter is one of the most common causes of incomplete draining.

• Remove and clean the filter per your model’s instructions
• Check the sump area for food debris, labels, glass, or buildup
• Reinstall the filter correctly (an improperly seated filter can also cause problems)

3) Check the Drain Hose for Kinks or Blockage

Inspect the drain hose behind the dishwasher (or under the sink, if visible).

• Look for kinks, pinches, or crushing
• Check for buildup where the hose connects under the sink
• Make sure the hose routing is not sagging excessively

4) Inspect the Sink/Disposal Drain Connection

If the dishwasher drains into a garbage disposal or sink tailpiece, a clog there can trigger I20.

• Run the sink and check for slow drainage
• If connected to a garbage disposal, make sure the disposal is clear
• If the dishwasher is newly installed, verify the disposal knockout plug was removed (common install issue)

5) Power Reset the Dishwasher

After clearing possible blockages, perform a reset:

1. Turn off power at the breaker for about 5 minutes
2. Restore power
3. Run a short cycle or drain cycle and monitor operation

Common Causes / Likely Parts (If I20 Keeps Returning)

If the code comes back after the basic checks, these are common parts or systems a technician may inspect:

• Drain pump (weak, jammed, or failed)
• Drain hose (internal blockage or routing issue)
• Air gap / sink connection path (if equipped)
• Wiring harness or connector to drain pump
• Main control board (not driving the drain pump correctly)
• Pressure / water level sensing issue on some models

When to Call Beacon

It’s time to schedule service if:

• You repeatedly get I20 after cleaning the filter and checking the hose
• The dishwasher leaves standing water after every cycle
• You hear a loud hum/grind from the drain area
• The drain pump does not run at all during a drain cycle
• You want the drain system tested without guesswork

Our friendly technicians in yellow can inspect the drain system, test the pump and controls, and help you avoid replacing the wrong part.

Request service with Beacon Services & Appliances or call (352) 726-7530. You can also visit www.BeaconSaves.com.