What F3T2 Means
JennAir's F3T2 page, which also shows the code written as F3.t2, names the convection thermistor or the associated wiring. On convection-capable over-the-range models that sensor governs the baking side of the appliance rather than the microwave side.
Common Causes of F3T2
- A convection thermistor that has failed
- A broken or chafed sensor lead in the convection airflow
- A connector at the control that has worked loose
🔧 One Safe Check You Can Try
Reset at the breaker for a minute, then test microwave-only and convection functions separately so you can report which of the two still works.
⚠ Why You Shouldn't Go Further Than That
- The convection thermistor sits in the hot airstream, and the surrounding metalwork stays hot long after a cycle has finished.
- A sensor reading incorrectly can let the convection element run past its intended temperature, which is not an error to keep exercising while you decide.
- Fasteners in the convection path seize with heat cycling, and shearing one turns a sensor change into a bracket repair.
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
- F3T2
- Appliance
- JennAir microwave
- 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.