What F3T2 Means
Over-the-Range Microwave: KitchenAid publishes for F3T2 "There may be a problem with the Convection Thermistor or the associated wiring." This code belongs to an over-the-range unit with a convection function, and the thermistor named is the one that reports on that cavity while the fan is circulating hot air. KitchenAid also prints this code as F3.t2 in a heading on its own page, so either spelling may be what you are looking at.
Common Causes of F3T2
- A convection thermistor failed or drifted
- Thermistor wiring damaged in a hot part of the appliance
- A control channel no longer reading it
🔧 One Safe Check You Can Try
Switch off the cooking surface underneath and let it cool before you stand at the appliance at all - an over-the-range unit puts your forearms directly above a range, and a burn from a hot hob is the injury that actually happens while people are troubleshooting a microwave. Then power the unit down by switching off the circuit breakers for one minute, power it back up, watch the microwave for one minute to see whether the code returns, and verify the microwave operates.
⚠ Why You Shouldn't Go Further Than That
- Convection means a heater and a fan working together, and an appliance that cannot measure the result is running a heating circuit without its feedback.
- The magnetron circuit runs at thousands of volts and its capacitor holds that charge with the appliance dead and cold, so no part of this diagnosis is an owner task once the case is on the other side of it.
- An over-the-range unit hangs on a wall bracket above a cooking surface and is bolted through the cabinet above it; taking it down is a two-person job over a cooktop, and dropping it is the usual way this goes wrong.
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.