Maytag Dishwasher F3 E1 — What It Means & How to Fix It
Also shown as F3E1, 3-1 on some models.
The combined temperature-and-soil sensor in your Maytag's sump has stopped giving the control a usable reading, so the machine can no longer tell how hot or how dirty the water is — sometimes just a fouled sensor face, sometimes a true sensor or wiring fault.
What this code means
F3 E1 (3-1 flashed) means the thermistor/OWI sensor circuit has gone open or unreadable. That single part does two jobs: the thermistor tracks water temperature while the optical water indicator gauges how cloudy the water is, which lets the dishwasher decide when the dishes are clean. With no trustworthy reading, the control raises the fault instead of guessing at cycle length.
The OWI reads through a small optical window in the sump, and a film of hard-water scale or grease over it can mimic a failed sensor — a cleaning cycle is a cheap thing to rule out before assuming the part has died.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Hard-water film or grease over the sensor window | Common | Yes — clean it |
| Open thermistor / OWI sensor | Common | No — technician job |
| Loose or corroded sensor connector | Occasional | No — technician job |
| Control or wiring fault | Less common | No — technician job |
What you can try yourself
- Unplug the dishwasher, lift out the tub filter, and wipe the sump area and any visible sensor window clear of grease and scale.
- Run a maintenance cycle with a dishwasher cleaner or citric acid to shift hard-water buildup a cloth can't reach.
- Restore power and run a normal cycle to see whether a clean reading comes back.
- If F3 E1 returns after cleaning, the sensor or its wiring has likely failed — a technician can confirm and replace it.
When to call a technician
- F3 E1 returns after the sump and sensor area are cleaned.
- Cycles run far too short or far too long, or dishes finish cold.
- The code shows alongside a heating fault, hinting at a shared sensor problem.
Typical professional repair cost: Sensor replacement typically runs $130–$260 with labour.
Frequently asked questions
What is the OWI sensor on a Maytag dishwasher?
OWI stands for Optical Water Indicator. It shines light through the wash water to measure how dirty it is, which lets the dishwasher decide how long to run. It's paired with the temperature sensor, and F3 E1 means the control lost a reliable signal from that combined part.
Can cleaning actually fix F3 E1?
Sometimes. A film of grease or limescale over the sensor's optical window can make it read like a failure. Cleaning the sump and running a maintenance cycle is worth trying before assuming the sensor is dead.
Why are my cycle times all over the place with F3 E1?
The dishwasher uses that sensor to judge how dirty the water is and how long to wash. Without a trustworthy reading it can't set the cycle length, so runs may end early or drag on — and it flags F3 E1 rather than guess.
Related Maytag codes
- Maytag Dishwasher F1 E1 Your Maytag's control board has flagged one of its own relays as stuck on — an output that should have switched off still reads live — and a full power-down often clears a false alarm, while a genuinely welded relay means board-level service.
- Maytag Dishwasher F2 E1 Your Maytag's control thinks one of the touchpad buttons is being held down — a stuck-button reading that's far more often caused by moisture or a sticky film on the panel than by a dead control.
- Maytag Dishwasher F5 E1 Your Maytag tried to begin a cycle and didn't sense the door securely latched — most often because the door wasn't pushed shut quickly enough after pressing Start, and less often because the latch or its switches are wearing out.
- Maytag Dishwasher F5 E2 Your Maytag is refusing to start a fresh cycle because it never saw the door opened and closed since the last one — a deliberate check you usually satisfy just by opening the door and shutting it again.
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