Whirlpool · Dishwasher
Whirlpool Dishwasher F24 Error Code
Overfill float switch stuck open
What this error means
F24 reports the overfill float switch in the front-right tub floor is stuck in the open position. The control interprets this as a flood risk and stops filling or running until the switch resets.
How F24 is detected
When F24 appears on a Whirlpool dishwasher, the control board has confirmed that water did not leave the machine within the programmed drain window. On Whirlpool WDT730PAHZ, Whirlpool WDT750SAKZ, and similar variants, the drain pump runs for a fixed interval—often three to seven minutes on washers and dishwashers—while a pressure switch or turbidity sensor verifies the tub or sump is empty. If water remains, the cycle stops to prevent spin with a full tub or overflow on the next fill.
Most F24 calls are resolved without parts: turn off power and open the door—gently press the float disc down until you hear a click. Restricted drain paths mimic pump failure because the impeller spins against a blocked hose or filter. Document whether the pump hums audibly during the drain step; a humming pump with no water movement points to a clogged filter or kinked hose, while silence may indicate a failed pump motor or loose wiring at the harness.
After clearing blockages, run a short cycle and listen at the drain hose for steady water flow. If F24 returns on the next load with a clean filter and straight hose, measure resistance at the pump motor connector per the service manual for your model before ordering a replacement pump assembly.
Common causes
- Dishwasher not level, tilting the float disc into the raised position
- Debris under the overfill float preventing it from dropping
- Water in the base drip pan from a tub seal leak
- Failed float switch microswitch inside the housing
Step-by-step fixes
- 1Turn off power and open the door—gently press the float disc down until you hear a click
- 2Level the dishwasher front-to-back and side-to-side with a bubble level
- 3Remove the toe kick and check the drip pan below for standing water
- 4Dry the base pan completely and locate the leak source before restarting
When to call a technician
If the float clicks freely but F24 returns with a dry base pan, replace the float switch assembly through service.
Affected models
- Whirlpool WDT730PAHZ
- Whirlpool WDT750SAKZ
- Whirlpool WDF540PADM
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use dishwashers to prevent F24 from lint and food debris buildup.
- Record when F24 appears in the cycle and whether it clears after a 60-second power reset on your Whirlpool dishwasher—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for F24; Whirlpool uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting F24; reversed plugs on pumps and valves cause immediate repeat faults.