Whirlpool · Dishwasher

F3

Pressure Switch Fault

Severity

Medium

The error code F3 on your Whirlpool Dishwasher indicates a specific system failure categorized as "Pressure Switch Fault". This guide walks you through the most likely causes and the correct repair sequence.

Owner's Summary

Your Whirlpool dishwasher's water level sensor is malfunctioning. This can cause the machine to use too much or too little water per cycle. Checking the small air tube connected to the sensor for blockage is the free first step.

Symptoms

Whirlpool dishwasher overfilling or not filling correctly, F3 error

Common Causes

Defective water pressure switch
Clogged pressure switch air chamber
Air tube disconnected from switch
PCB not reading switch signal correctly

How to Fix

1 Inspect air tube connected to pressure switch — clear if blocked
2 Test pressure switch with multimeter for open and close operation
3 Clean sump air dome if clogged
4 Replace pressure switch if it does not change state with water level
5 Replace PCB if switch tests good

Tools You'll Need

Multimeter Towels / Bucket Bubble Level Flashlight

These are simple, low-risk fixes most homeowners can do with tools already in a basic toolbox.

Technical Explanation

The pressure switch is a reed-type switch actuated by air pressure changes in the sump air dome. F3 is generated when the CCU receives an unexpected switch state change, or when the switch state is inconsistent with the commanded fill or drain phase.

Is It Safe to Keep Using?

Monitor fill levels. If the machine overfills, close the supply valve immediately.

Technician's Pro Tip

The air tube on Whirlpool dishwashers is a short rubber hose connecting the sump to the pressure switch. Over time it hardens and cracks — a crack causes a constant air leak that makes the switch read empty regardless of actual water level. Inspect this tube carefully.

Related Codes

F21 — Whirlpool Washing Machine

Long Drain Time or Drain Pump Fault

High

F20 — Whirlpool Washing Machine

No Water Detected

High

F7E1 — Whirlpool Washing Machine

Motor Speed Sensing Error

High

Frequently Asked Questions

What does error code F3 mean on a Whirlpool Dishwasher?

Code F3 on a Whirlpool Dishwasher indicates "Pressure Switch Fault." In practice, the most common trigger is defective water pressure switch. Severity is rated medium, and typical repair costs range from $15 to $180.

Can I fix F3 myself, or do I need a technician?

Many cases of F3 can be resolved without a technician. The first step to try: inspect air tube connected to pressure switch — clear if blocked. If that doesn't clear the code, work through the remaining steps in the "How to Fix" section above before assuming a part needs replacing.

Is it safe to keep using my dishwasher with code F3 showing?

Monitor fill levels. If the machine overfills, close the supply valve immediately.

How much does it cost to repair F3 on a Whirlpool Dishwasher?

Repair costs for code F3 typically range from $15 to $180. Pressure switch: $15–$50; PCB: $80–$180. Costs on the low end usually reflect a DIY fix with no parts required, while the high end reflects a part replacement plus professional labor.

Estimated Repair Cost USD

$15 – $180

Pressure switch: $15–$50; PCB: $80–$180