Whirlpool Dishwasher Error Code SYMPTOM‑NOT‑DRAINING — How to Fix (Dishwasher Not Draining)

Field note: SYMPTOM‑NOT‑DRAINING means the machine did not see a drain complete — it is not a default control-board part. On Whirlpool Dishwashers start at the filter/sump, high-loop / height of the drain hose, and the impeller. A crushed hose or a coin on the impeller looks identical to a ‘bad pump’ on a scan tool.

What this code is not

• Not ‘replace the board because it will not empty.’
• Not a water-inlet problem (that is a fill code).
• A missing high loop that siphons, or a disposer knockout still in place, will retrip SYMPTOM‑NOT‑DRAINING after any new pump.

The Whirlpool Dishwasher error SYMPTOM-NOT-DRAINING can be frustrating, especially when you’re left with a tub full of water and dirty dishes. This error code indicates that the dishwasher’s control board has detected water remaining in the tub after a cycle finishes. In this comprehensive guide, we’ll walk you through the causes, diagnostic steps, and repair procedures to get your Whirlpool Dishwasher up and running again.

First Things to Check (use before calling anyone)

Before calling a professional or embarking on a complex repair, perform these quick diagnostic checks:

• Power cycle: Unplug the dishwasher or turn off the circuit breaker for 60 seconds to reset the control board. Restore power and try running a cycle.
• Check the drain hose: Inspect the drain hose for kinks, blockages, or improper installation. Ensure the hose is securely connected to the dishwasher and drain pipe.
• Check the filter and sump: Open the dishwasher door and remove the lower rack. Unscrew the filter cover and inspect for debris. Clean or replace the filter as needed.

The Usual Suspects Behind This Code

Based on repair data and technician experience, here are the most common causes of the SYMPTOM-NOT-DRAINING error:

1. Clogged or Faulty Drain Pump

• Description: The drain pump is responsible for removing water from the dishwasher. A clogged or faulty pump can prevent proper drainage.
• How to verify: Test the drain pump motor using a multimeter (continuity mode). Check for blockages or debris in the pump impeller.
• Fix difficulty: Medium to High
• Cost: $50-$200 (depending on the replacement pump)

2. Blocked or Kinked Drain Hose

• Description: A blocked or kinked drain hose can prevent water from draining properly.
• How to verify: Inspect the drain hose for kinks, blockages, or improper installation.
• Fix difficulty: Low to Medium
• Cost: $0-$50 (depending on the repair)

3. Faulty Float Switch

• Description: The float switch signals the control board when the tub is empty. A faulty switch can prevent the dishwasher from draining properly.
• How to verify: Test the float switch using a multimeter (continuity mode). Check for proper installation and movement.
• Fix difficulty: Medium
• Cost: $20-$100 (depending on the replacement switch)

4. Clogged Air-Gap or Garbage-Disposal Connection

• Description: A clogged air-gap or garbage-disposal connection can prevent proper drainage.
• How to verify: Remove the air-gap cap and inspect for debris. Check the garbage-disposal connection for blockages.
• Fix difficulty: Low to Medium
• Cost: $0-$50 (depending on the repair)

The Primary Fix — Detailed Guide

The most common cause of the SYMPTOM-NOT-DRAINING error is a clogged or faulty drain pump. Here’s a step-by-step guide to replace the drain pump:

Safety warnings:

• Unplug the dishwasher or turn off the circuit breaker to prevent electrical shock.
• Wear protective gloves and safety glasses.

Tools needed:

• Phillips #2 screwdriver
• Flat-head screwdriver
• T20 Torx driver
• Digital multimeter (0-20 V range, continuity mode)
• Needle-nose pliers
• Small bucket or shallow pan

Time estimate: 1-2 hours

Step-by-Step Instructions:

1. Disconnect power: Unplug the dishwasher or turn off the circuit breaker.
2. Remove the lower panel: Use a Phillips #2 screwdriver to remove the screws holding the lower panel in place. Gently pull the panel away from the dishwasher.
3. Locate the drain pump: The drain pump is usually located under the tub, behind the lower panel.
4. Disconnect the drain pump electrical connector: Use needle-nose pliers to release the connector from the pump.
5. Remove the drain pump mounting screws: Use a T20 Torx driver to remove the screws holding the pump in place.
6. Pull out the drain pump: Gently pull the pump out of the dishwasher tub.
7. Inspect and clean the pump: Inspect the pump impeller for blockages or debris. Clean or replace the pump as needed.
8. Install the new drain pump: Mount the new pump to the tub using the T20 Torx driver. Connect the electrical connector to the pump.
9. Reassemble the dishwasher: Replace the lower panel and reconnect power.

What Differs Between Models

While the SYMPTOM-NOT-DRAINING error is common across many Whirlpool Dishwasher models, some models may have variations in design or repair procedures. Here are some model-specific differences:

• Whirlpool WDF520PADM: This model has a slightly different drain pump design, requiring a specific replacement pump (Whirlpool part number W10894263).
• Whirlpool WDTA50SAHZ: This model has a built-in drain pump filter, which may require cleaning or replacement.

Price Range for This Repair

The cost of repairing the SYMPTOM-NOT-DRAINING error can vary depending on the cause and replacement parts. Here’s a breakdown of estimated costs:

Stop This Problem Before It Starts

To prevent the SYMPTOM-NOT-DRAINING error from occurring in the future, follow these maintenance tips:

• Regularly clean the filter and sump: Remove and clean the filter and sump every 1-2 months to prevent debris buildup.
• Check and clean the drain hose: Inspect and clean the drain hose every 6-12 months to prevent blockages.
• Run a cleaning cycle: Run a cleaning cycle (such as a hot water cycle with a dishwasher cleaner) every 3-6 months to maintain the dishwasher’s performance.

When This Repair Requires Professional Tools

If you’re not comfortable with DIY repairs or if the issue persists after trying the above steps, it’s time to call a professional. Here are some scenarios where professional help is recommended:

• Complex repairs: If the issue requires complex repairs, such as replacing the control board or motor, it’s best to hire a professional.
• Uncertain diagnosis: If you’re unsure about the cause of the error or need help diagnosing the issue, a professional can help.
• Warranty coverage: If your dishwasher is still under warranty, contact Whirlpool or a authorized service provider for assistance.

Whirlpool Support: 1-866-698-2538

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