--- title: "JennAir F4E4: the humidity thermistor for sensor programs" description: "What F4E4 means on JennAir F4E4: the humidity thermistor for sensor programss, what to check before booking, and when it is not a failure at all." url: "https://microwaverepair.center/error-codes/jennair-f4e4/" --- # JennAir F4E4: the humidity thermistor for sensor programs Automatic reheat and cook programs on a JennAir hood combination stop when the humidity reading rises the right amount. ## What F4E4 actually means. Automatic reheat and cook programs on a JennAir hood combination stop when the humidity reading rises the right amount. F4E4 means that humidity thermistor or its wiring is out of range, so those programs cannot finish correctly. JennAir microwave display · also shown as F4 E4 What to do when F4E4 shows on the microwave ### Kind of code Sensors and temperature The control has stopped trusting what one of its sensors reports: the cook or humidity sensor that ends a sensor reheat when steam rises, or a thermal cutout that trips when the cavity or the magnetron runs too hot. A cutout that opens stops the microwave mid-cycle and often recovers once it cools; one that keeps tripping, or a sensor program that shuts off at once every time, needs the sensor, its wiring or the airflow behind it checked. ### Usually leads to Microwave control board and touchpad repair Tracing a dead display, keys that do not answer or a code that keeps returning to the keypad, the ribbon, the relays or the main board, and replacing only the part that failed. ### Shows up as What a Microwave Error Code Is Telling You A microwave error code may be a letter and a number on the display, a lock or demo word, a row of dashes, or a beep with a blinking clock, and it can show while the microwave still heats or block every key until it is cleared. ### Make JennAir JennAir microwaves looked at in place, with the breaker, the door switches and a one-minute heat test covered before any part is priced. ### Source JennAir Product Help, over-the-range microwave: F4E4 From JennAir's help pages for its microwave hood combinations (Euro-style, including the convection models). The code set varies with the control generation, so a code missing from your model's manual may not apply to it. ## Before you book, in this order. Each step comes from JennAir's own guidance for F4E4 on its microwaves. Follow it to the end: the last card says whether this is a visit. 01 Turn the microwave off at the circuit breaker, count a full minute, then restore power. 02 Give it a minute on standby; a code that does not reappear was likely a one-time glitch, so run a short cycle to confirm. 03 Cook with a set time and power level until it is fixed. 04 If F4E4 keeps appearing, book a visit. ### Still there? It usually turns into [microwave control board and touchpad repair](https://microwaverepair.center/services/microwave-control-board-and-touchpad-repair/). Book with the code and the model number. ### What not to do F4E4 does not block manual cooking by itself. It is also not a sign that food was covered too tightly, which only makes a sensor program run long. ## What you may notice with it. The microwave problems F4E4 tends to arrive with. Answer these at the microwave before anyone is booked. [All problems](https://microwaverepair.center/problems/) Before you call ### [What a Microwave Error Code Is Telling You](https://microwaverepair.center/problems/microwave-error-code/) [All 7 causes, cheapest first](https://microwaverepair.center/problems/microwave-error-code/) It also comes with - [**Microwave Shuts Off Before the Timer Ends**](https://microwaverepair.center/problems/microwave-stops-mid-cycle/) Problem ### What a Microwave Error Code Is Telling You 7 causes, cheapest first Where F4E4 usually leads ## Microwave control board and touchpad repair. **Control board, keypad membrane or display · moderate to highest.** Book a visit [What the job involves](https://microwaverepair.center/services/microwave-control-board-and-touchpad-repair/) ## JennAir microwaves. JennAir microwaves looked at in place, with the breaker, the door switches and a one-minute heat test covered before any part is priced. [JennAir microwave repair](https://microwaverepair.center/brands/jennair/) More JennAir codes [LOC](https://microwaverepair.center/error-codes/jennair-loc/) [DOOR](https://microwaverepair.center/error-codes/jennair-door/) [PF](https://microwaverepair.center/error-codes/jennair-pf/) [Demo](https://microwaverepair.center/error-codes/jennair-demo/) [E03](https://microwaverepair.center/error-codes/jennair-e03/) [E11](https://microwaverepair.center/error-codes/jennair-e11/) [E21](https://microwaverepair.center/error-codes/jennair-e21/) [F3T3](https://microwaverepair.center/error-codes/jennair-f3t3/) [F4E1](https://microwaverepair.center/error-codes/jennair-f4e1/) [F6E0](https://microwaverepair.center/error-codes/jennair-f6e0/) [F7E9](https://microwaverepair.center/error-codes/jennair-f7e9/) [F9Q1](https://microwaverepair.center/error-codes/jennair-f9q1/) [All 21 JennAir codes](https://microwaverepair.center/error-codes/#codes-jennair) Sensors and temperature on other makes [Bertazzoni ERROR](https://microwaverepair.center/error-codes/bertazzoni-error/) [Bosch ERROR](https://microwaverepair.center/error-codes/bosch-error/) [Café HOT](https://microwaverepair.center/error-codes/cafe-hot/) [Dacor C-10](https://microwaverepair.center/error-codes/dacor-c-10/) [Fisher & Paykel A1](https://microwaverepair.center/error-codes/fisher-and-paykel-a1/) [Fulgor Milano ERROR](https://microwaverepair.center/error-codes/fulgor-milano-error/) [GE Profile ERR](https://microwaverepair.center/error-codes/ge-profile-err/) [KitchenAid F3H1](https://microwaverepair.center/error-codes/kitchenaid-f3h1/) [All 39 codes of this kind](https://microwaverepair.center/error-codes/#family-sensor) JennAir builds this ### Microwave hood combination The microwave that hangs from the wall cabinets above the burners, heating food in its cavity while its own fan, light and filters handle the steam and grease rising from the pans beneath it. JennAir builds this ### Built-in microwave A microwave set into a tall cabinet or a wall of cabinetry at eye level, either a countertop body wrapped in a trim kit or a true built-in model, including speed and convection microwaves that brown as well as heat. JennAir builds this ### Microwave drawer A microwave built under a counter or into a kitchen island that opens like a drawer at the touch of a key, with a motor and gears sliding its cavity out toward you. ## In JennAir's own words > There may be a problem with the Humidity Thermistor or the associated wiring. [JennAir Product Help, over-the-range microwave: F4E4](https://producthelp.jennair.com/Cooking/Microwaves/Over-the-Range_Microwave/Error_Code/Starts_with_F/Starts_with_F4/F4E4_-_Error_Code_-_Over-the-Range_Microwave) [JennAir Product Help, over-the-range microwave: F4E4](https://producthelp.jennair.com/Cooking/Microwaves/Over-the-Range_Microwave/Error_Code/Starts_with_F/Starts_with_F4/F4E4_-_Error_Code_-_Over-the-Range_Microwave) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. From JennAir's help pages for its microwave hood combinations (Euro-style, including the convection models). The code set varies with the control generation, so a code missing from your model's manual may not apply to it. ## JennAir F4E4 microwave repair, where we come out. The same visit in every metro below: the code, the model number, and a diagnosis before any part is ordered. 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Turn the microwave off at the circuit breaker, count a full minute, then restore power. If it comes back, it needs a visit. ### Why do sensor programs fail on my JennAir with F4E4? They depend on the humidity reading that the code says is out of range, so the control cannot judge doneness. ### Is F4E4 related to steam on the JennAir door? Normal condensation on the door does not cause it. The code is about the sensor's electrical reading. ### Does F4E4 on JennAir need a new board? Usually the thermistor or its connector is the repair, not the board. --- **[Read on the site: JennAir F4E4: the humidity thermistor for sensor programs](https://microwaverepair.center/error-codes/jennair-f4e4/)** **[Book a visit with MicrowaveRepair.center](https://microwaverepair.center/schedule/)**