F3T3 on an over-the-range JennAir microwave refers to the hood temperature thermistor or wiring.
Model compatibility: JennAir reuses codes across series and model years, so F3T3 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
Possible problem with the hood temperature thermistor or the associated wiring.
An over-the-range JennAir microwave also acts as a range hood, and that explains the word in F3T3: the code names the hood temperature thermistor and its wiring.
How much the entry tells you
Very little beyond the part name. There is no trigger temperature, no mention of whether cooking was under way, and no cause. A technician would test the sensor circuit rather than look for something visible.
The reset, as JennAir writes it
Turn the breaker(s) off for one minute to power the unit down.
Turn power back on.
Monitor for one minute to be sure the code stays off the display.
Verify operation.
If the code does show again, JennAir says a qualified technician may be needed.
Give the code, F3T3, and say your microwave is an over-the-range model. Say when it appeared and whether the reset cleared it permanently or only for a while. There are no other owner checks for this thermistor, and none involves opening the unit.
Microwave service in Los Angeles
Call (310) 622-9465 about F3T3 and expect to be asked for the model number and how the reset went.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your JennAir appliance?
Book a specialist visit for a clear estimate and approval before any repair.
