--- title: "JennAir E23: convection preheat ran out of time" description: "What E23 means on JennAir E23: convection preheat ran out of times, what to check before booking, and when it is not a failure at all." url: "https://microwaverepair.center/error-codes/jennair-e23/" --- # JennAir E23: convection preheat ran out of time JennAir's convection hood models heat the cavity with an element and fan before baking. ## What E23 actually means. JennAir's convection hood models heat the cavity with an element and fan before baking. If half an hour passes and the target is still not reached, the control gives up with E23 and points at the heater, the control board or the wiring between them. JennAir microwave display What to do when E23 shows on the microwave ### Kind of code Heating and magnetron The microwave ran a cycle and the control saw no heat come of it, or saw the power section behave strangely. The cause sits somewhere in the chain that makes the energy: the magnetron, the high-voltage diode and capacitor, the transformer that feeds them. All of it lives behind the outer cabinet, where a capacitor keeps a dangerous charge even unplugged, so after a restart the owner's part ends at booking the visit. ### Usually leads to Microwave magnetron repair Replacing the tube that makes a microwave's heat, after proving the parts that feed it are sound, and renewing the waveguide cover and any pitted metal where sparks have been. ### 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: E23 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. E23 applies only to models with convection. ## Before you book, in this order. Each step comes from JennAir's own guidance for E23 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 Test microwave heating separately with a cup of water; it uses different parts. 04 If preheat fails again, book a visit to test the convection heater. ### Still there? It usually turns into [microwave magnetron repair](https://microwaverepair.center/services/microwave-magnetron-repair/). Book with the code and the model number. ### What not to do E23 is about too little convection heat, not about the magnetron. Opening the door briefly during preheat does not cause it. ## What you may notice with it. The microwave problems E23 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 Runs but Food Stays Cold**](https://microwaverepair.center/problems/microwave-not-heating/) Problem ### What a Microwave Error Code Is Telling You 7 causes, cheapest first Where E23 usually leads ## Microwave magnetron repair. **Magnetron and waveguide cover · moderate to highest.** Book a visit [What the job involves](https://microwaverepair.center/services/microwave-magnetron-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/) [F4E4](https://microwaverepair.center/error-codes/jennair-f4e4/) [F6E0](https://microwaverepair.center/error-codes/jennair-f6e0/) [F7E9](https://microwaverepair.center/error-codes/jennair-f7e9/) [All 21 JennAir codes](https://microwaverepair.center/error-codes/#codes-jennair) Heating and magnetron on other makes [Fisher & Paykel A5](https://microwaverepair.center/error-codes/fisher-and-paykel-a5/) [KitchenAid F3T4](https://microwaverepair.center/error-codes/kitchenaid-f3t4/) [All 4 codes of this kind](https://microwaverepair.center/error-codes/#family-heating) 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 > The oven did not reach Pre-Heat Temperature within 30 (thirty) minutes. [JennAir Product Help, over-the-range microwave: E23](https://producthelp.jennair.com/Cooking/Microwaves/Over-the-Range_Microwave/Error_Code/Starts_with_an_E/E23_-_Error_Code_-_Over-the-Range_Microwave) [JennAir Product Help, over-the-range microwave: E23](https://producthelp.jennair.com/Cooking/Microwaves/Over-the-Range_Microwave/Error_Code/Starts_with_an_E/E23_-_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. E23 applies only to models with convection. ## JennAir E23 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. ### Can I keep microwaving with E23 on my JennAir? If a cup of water heats on microwave power, yes. E23 concerns the convection heater. ### How long does a JennAir give preheat before E23? Thirty minutes. A normal preheat finishes well inside that. ### What part usually fixes E23 on a JennAir? The convection heater is the first suspect, with the board and wiring checked alongside it. --- **[Read on the site: JennAir E23: convection preheat ran out of time](https://microwaverepair.center/error-codes/jennair-e23/)** **[Book a visit with MicrowaveRepair.center](https://microwaverepair.center/schedule/)**