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Error code reference

Dacor Dishwasher Error Code F-4

Drain pump fault

Dacor codesDacor dishwasher codes

Drain pump fault – following a drain cycle, if the WPS still detects water conductivity in the sump, the controller signals a faulty drain pump.

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What F-4 means on a Dacor dishwasher

The F-4 error code on a Dacor dishwasher indicates a drain pump fault. After the controller initiates a drain cycle, the Water Presence Sensor (WPS) monitors the sump to confirm that water has been successfully evacuated. If the WPS continues to detect water conductivity in the sump after the drain cycle completes, the controller interprets this as a failure of the drain pump to clear the water and triggers the F-4 fault.

The drain pump is responsible for forcing water out of the sump and through the drain hose at the end of wash and rinse cycles. A failure in this system can stem from several sources: a mechanically seized or electrically failed drain pump motor, a clogged pump impeller from food debris or foreign objects, a kinked or obstructed drain hose, or a blocked air gap or garbage disposal connection. Any of these conditions can prevent adequate water removal, leaving residual water that the WPS detects.

The WPS itself is also part of the diagnostic picture. If the sensor is malfunctioning or has a fouled probe, it may falsely report water conductivity even after a successful drain, triggering F-4 without an actual pump failure. Technicians should verify actual standing water in the sump before assuming the drain pump has failed. Checking the pump for continuity, inspecting for physical blockages, and testing the WPS are all necessary steps to isolate the root cause.

Source: manufacturer service documentation.

Common causes of F-4

  1. 01

    Clogged drain pump or impeller

    Wiring / connection

    Food debris, broken glass, or small foreign objects can jam the pump impeller, preventing it from spinning and pumping out water. Inspect the pump chamber for blockages after removing the lower spray arm and filter assembly.

  2. 02

    Failed drain pump motor

    Part replacement

    The drain pump motor can fail electrically or mechanically, leaving it unable to run during the drain cycle. Check the motor windings for continuity and verify the pump receives proper voltage from the controller during the drain sequence.

  3. 03

    Blocked or kinked drain hose

    Wiring / connection

    A kinked, pinched, or clogged drain hose will restrict water flow even if the pump is functioning correctly. Inspect the full length of the drain hose from the pump outlet to the drain connection point at the sink or garbage disposal.

  4. 04

    Faulty or fouled Water Presence Sensor (WPS)

    Part replacement

    If the WPS probe is coated with scale, grease, or residue, it may falsely signal water conductivity after the sump has drained. Clean the sensor probe and test its output to confirm it reads correctly in both wet and dry conditions.

  5. 05

    Blocked air gap or garbage disposal connection

    Wiring / connection

    A clogged air gap on the sink or a blocked inlet on the garbage disposal can create backpressure that prevents the dishwasher from draining fully. Check and clear the air gap cap and confirm the disposal knockout plug has been removed if the disposal was recently installed.

See the test procedure for each cause

Frequently asked questions about F-4

What does F-4 mean on a Dacor dishwasher?
F-4 is a drain pump fault code. After the dishwasher runs a drain cycle, the Water Presence Sensor (WPS) checks the sump for residual water. If the sensor still detects water conductivity, the controller flags the F-4 code to indicate that the drain pump did not successfully clear the sump. The fault can be caused by a failed pump, a blockage, or a malfunctioning sensor.
Can I fix the F-4 error on my Dacor dishwasher myself?
Some causes of F-4 are DIY-friendly. Clearing a clogged pump impeller, removing a blockage from the drain hose, or cleaning out an air gap does not require special tools or parts. However, replacing a failed drain pump motor or a faulty WPS involves disassembly of the unit and working with wiring, which is best handled by a technician if you are not comfortable with appliance repair.
Is it safe to keep using my Dacor dishwasher when the F-4 code is showing?
You should not continue running the dishwasher while F-4 is active. Standing water in the sump can lead to odors, mold growth, and potential overflow during the next cycle. Resolve the drain issue before running another wash cycle to avoid water damage or further mechanical problems.
Will resetting the dishwasher clear the F-4 error code?
A reset may temporarily clear the F-4 code, but if the underlying drain problem has not been fixed, the fault will return the next time the dishwasher attempts to drain. Resetting without addressing the root cause is not a solution. The drain pump, hose, and WPS should all be inspected and confirmed to be working correctly before relying on the machine to operate normally.
How much does it cost to repair a Dacor dishwasher showing the F-4 error?
Repair costs depend on the root cause. Clearing a simple blockage in the drain hose or pump is often inexpensive, primarily involving labor costs in the range of $75 to $150 if a technician is called. Replacing a drain pump motor typically adds parts costs in the range of $50 to $150 on top of labor. A WPS replacement is generally less expensive in parts but still requires a service visit, putting total repair costs roughly in the $100 to $300 range depending on your location and the specific failure.

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