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Whirlpool Dishwasher Error Code F4 (Drain Fault)

F4 means water is staying in the tub after the drain cycle, usually a clogged filter.

Risk: Low

Meaning

F4 appears when water remains in the tub after the drain cycle finishes. It’s one of the most common codes, and often a clogged filter is the cause.

The information provided here is a diagnostic aid and does not replace the intervention of a qualified professional.

Possible causes

No cause is certain until it has been checked on the appliance.

Likely Bottom filter clogged
Possible Drain hose kinked or blocked
Possible Drain pump jammed by debris

Tools needed

Towels
Shallow tray
Gloves
Flat screwdriver

First checks

Remove and clean the bottom filter under hot water.
Check the drain hose and sink's P-trap if connected to it.
Confirm nothing is blocking the pump impeller.

Step-by-step diagnosis

Cut power. Bail out the standing water with a cup, then finish with a sponge.
Lift out the filter assembly and take it fully apart. Rinse both stages under hot water until the mesh runs clear.
Clean the sump underneath. Debris settles there out of sight and that is usually where the fault actually lives.
Turn the pump impeller with a fingertip. It has to spin freely, with no grinding and no crunch of glass.
Disconnect the drain hose and flush it, then check the sink trap. If the machine drains into a disposer, confirm the knockout plug was removed at installation.
Reassemble, run a short cycle, and check the sump empties completely at the end.

What not to do

Running cycles repeatedly without cleaning the filter first.
Ignoring a fast-returning F4 as a fluke — it often means a blocked garbage disposal knockout plug or drain hose, not just a dirty filter.

When to stop

The impeller is jammed by something you cannot reach.
The tub stays full with filter, hose, and trap all clear.

An error code varies by brand

The same code can have a different meaning depending on the brand and model. Always check your appliance's manual before acting.

Related guides

When to call a professional

If the simple checks turned up nothing, if the repair involves electricity, gas, or the sealed refrigerant system, or if you have any doubt at all: stop there and hand the appliance over to a qualified technician.