What F3E2 Means
JennAir's F3E2 page names the thermistor or the OWI sensor as the potential cause. The thermistor measures water temperature; the optical water indicator judges how dirty the water is, and together they decide how long and how hot a cycle needs to be.
Common Causes of F3E2
- A thermistor reading outside its accepted range
- An optical water sensor clouded by film or hard-water deposits
- Wiring between either sensor and the control that has failed
🔧 One Safe Check You Can Try
Cut power for thirty seconds and restore it, then run a normal cycle and see whether the dishes come out as clean and as dry as they used to - that observation tells the technician which of the two sensors is likely involved.
⚠ Why You Shouldn't Go Further Than That
- The optical sensor works by looking through the wash water, so it is degraded by exactly the deposits it sits in - and cleaning it properly means getting under the sump.
- Both sensors live below the tub floor beside the wash motor, where the wiring is wet, live during operation and not a sensible place to probe.
- Lifting the sump to reach them disturbs the tub gasket, and a gasket pinched on reassembly leaks underneath the machine where nobody sees it for weeks.
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.
Technical Reference
- Code
- F3E2
- Appliance
- JennAir dishwasher
- Maker documentation
- JennAir owner manuals and use & care guides
- Checked
- September 2026
Code meanings can change between control generations. Before acting on a code, match the full model number on your appliance's rating label against the manual for that model. We are an independent repair service, not affiliated with Whirlpool Corporation.