What F3E2 Means
Maytag names the potential cause of F3E2 as the thermistor or the OWI sensor. The thermistor reads water temperature; the OWI, or optical water indicator, reads how cloudy the wash water is so the machine can decide how long to wash and when to change the water. A fault in either leaves the control without the readings it uses to run the cycle.
Common Causes of F3E2
- Scale or grease film over the OWI sensor lens
- Hard water without rinse aid
- Thermistor failed or out of tolerance
- OWI sensor failed
- Wiring to the sensor damaged
🔧 One Safe Check You Can Try
Reset the control by cutting power for thirty seconds - unplug the dishwasher if it is on an outlet, or switch off its breaker if it is hard-wired - then restore power and run a short cycle. Then check the bottom of the tub: the OWI sensor is a small lens in the sump area, and a film of hard-water scale, grease or dissolved food soil across it will make it read wrongly. Running an empty cycle with a dishwasher cleaner, and using rinse aid if your water is hard, addresses the cause most often behind a clouded sensor. If the code persists after cleaning and a reset, the sensor or the thermistor has failed.
⚠ Why You Shouldn't Go Further Than That
- Do not scrape the sensor lens; a scratched lens reads no better than a dirty one.
- Replacing either sensor means removing the lower spray arm and filter assembly and working on mains-connected parts, so it is a service job.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.