Maytag · Dishwasher
Maytag Dishwasher F3E1 Error Code
Thermistor open or shorted
What this error means
F3E1 means the wash thermistor sent an invalid reading. The control cannot verify water temperature for heat steps and drying efficiency.
How F3E1 is detected
When F3E1 appears on a Maytag dishwasher, the control board has confirmed that water did not leave the machine within the programmed drain window. On Maytag MDB4949SKZ, Maytag MDB8989SHZ, 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 F3E1 calls are resolved without parts: remove power and reseat the thermistor plug at the bottom of the tub. 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 F3E1 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
- Thermistor connector loose at the sump
- Scale coating on the sensor bulb
- Open thermistor wire in the door-tub harness
- Shorted sensor from water intrusion
Step-by-step fixes
- 1Remove power and reseat the thermistor plug at the bottom of the tub
- 2Clean the sensor tip with a soft brush
- 3Compare resistance to the service chart at 77°F
- 4Run a cycle with hot water primed at the kitchen tap
When to call a technician
Out-of-spec thermistor readings with good wiring require sensor or harness replacement.
Affected models
- Maytag MDB4949SKZ
- Maytag MDB8989SHZ
- Maytag MDB7759AWM
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use dishwashers to prevent F3E1 from lint and food debris buildup.
- Record when F3E1 appears in the cycle and whether it clears after a 60-second power reset on your Maytag dishwasher—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for F3E1; Maytag uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting F3E1; reversed plugs on pumps and valves cause immediate repeat faults.