--- title: "BlueStar BSDF oven showing F40 | OvenRepair.center" description: "What F40 means on BlueStar BSDF ovens, what to check before booking, and when it is not a failure at all." url: "https://ovenrepair.center/error-codes/bluestar-f40/" --- # BlueStar BSDF oven showing F40 Control Error F40 on a BlueStar dual-fuel oven touchscreen points to the oven temperature sensor, the probe inside the cavity that tells the control how hot the oven is. ## What F40 actually means. Control Error F40 on a BlueStar dual-fuel oven touchscreen points to the oven temperature sensor, the probe inside the cavity that tells the control how hot the oven is. Without a trustworthy reading the oven cannot hold its setting. BlueStar oven display What to do when F40 shows on the oven ### Kind of code Temperature sensor The reading from the temperature probe fell outside what the control will trust, or climbed far higher than the setting. A loose connector or a probe that has drifted is ruled out before the control itself, and a reading that runs away means the breaker goes off first. ### Usually leads to Temperature sensor and calibration Baking that comes out burnt or pale at the usual setting, traced to the sensor, its wiring or an oven that simply needs calibrating. ### Shows up as Oven Temperature Not Accurate Recipes come out burnt or underdone at the right setting, and an oven thermometer reads far from the dial. ### Make BlueStar A Pennsylvania maker of professional-style cooking appliances, including gas and electric wall ovens offered in hundreds of colors. ### Source BlueStar Dual Fuel Range User Manual, part 200009 rev. 1, troubleshooting (bluestarcooking.com PDF) Touchscreen BSDF dual-fuel ovens; the same table appears for all four widths. ## Before you book, in this order. Each step comes from BlueStar's own guidance for F40 on its ovens. Follow it to the end: the last card says whether this is a visit. 01 Switch the oven off and give it time to cool. 02 Do not open the back panel or unplug the sensor yourself. 03 Book a visit so the sensor and its connection can be tested. ### Still there? It usually turns into [temperature sensor and calibration](https://ovenrepair.center/services/temperature-sensor-and-calibration/). Book with the code and the model number. ### What not to do F40 is not the meat probe. The removable probe you push into a roast has its own code, F50. ## What you may notice with it. The oven problems F40 tends to arrive with. Answer these at the oven before anyone is booked. [All problems](https://ovenrepair.center/problems/) Before you call ### [Oven Temperature Not Accurate](https://ovenrepair.center/problems/oven-temperature-wrong/) [All 5 causes, cheapest first](https://ovenrepair.center/problems/oven-temperature-wrong/) It also comes with - [**Oven Not Heating**](https://ovenrepair.center/problems/oven-not-heating/) - [**Oven Error Code**](https://ovenrepair.center/problems/oven-error-code/) Problem ### Oven Temperature Not Accurate 5 causes, cheapest first Where F40 usually leads ## Temperature sensor and calibration. **Temperature sensor or calibration · low.** Book a visit [What the job involves](https://ovenrepair.center/services/temperature-sensor-and-calibration/) ## BlueStar ovens. A Pennsylvania maker of professional-style cooking appliances, including gas and electric wall ovens offered in hundreds of colors. [BlueStar oven repair](https://ovenrepair.center/brands/bluestar/) More BlueStar codes [F20](https://ovenrepair.center/error-codes/bluestar-f20/) [F50](https://ovenrepair.center/error-codes/bluestar-f50/) [F60](https://ovenrepair.center/error-codes/bluestar-f60/) [F80](https://ovenrepair.center/error-codes/bluestar-f80/) Temperature sensor on other makes [Dacor C-20](https://ovenrepair.center/error-codes/dacor-c-20/) [Electrolux F30](https://ovenrepair.center/error-codes/electrolux-f30/) [Fisher & Paykel F210](https://ovenrepair.center/error-codes/fisher-and-paykel-f210/) [Frigidaire F30](https://ovenrepair.center/error-codes/frigidaire-f30/) [GE Profile F4](https://ovenrepair.center/error-codes/ge-profile-f4/) [GE F3](https://ovenrepair.center/error-codes/ge-f3/) [JennAir F3 E0](https://ovenrepair.center/error-codes/jennair-f3e0/) [Kenmore F3/E0](https://ovenrepair.center/error-codes/kenmore-f3-e0/) [All 29 codes of this kind](https://ovenrepair.center/error-codes/#family-sensor-circuit) BlueStar builds this ### Single wall oven One oven cavity set into a cabinet at chest height, with its own controls above the door and nothing to cook on above it. BlueStar builds this ### Double wall oven Two full oven cavities stacked in one tall cabinet, sharing one control panel and one power supply but heating on their own. ## In BlueStar's own words > Control Error F40 [BlueStar Dual Fuel Range User Manual, part 200009 rev. 1, troubleshooting (bluestarcooking.com PDF)](https://www.bluestarcooking.com/wp-content/uploads/2022/09/200009-ver1-052023.pdf) [BlueStar Dual Fuel Range User Manual, part 200009 rev. 1, troubleshooting (bluestarcooking.com PDF)](https://www.bluestarcooking.com/wp-content/uploads/2022/09/200009-ver1-052023.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Touchscreen BSDF dual-fuel ovens; the same table appears for all four widths. ## BlueStar F40 oven 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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Switch the oven off and give it time to cool. If it comes back, it needs a visit. ### Why is my BlueStar oven baking unevenly around the time F40 appeared? F40 means the control doubts its own temperature reading, so it may overshoot or undershoot. That can show in the food before the code does. ### Is it the BlueStar sensor or its wiring behind F40? BlueStar's manual names the oven temperature sensor. A technician tests both the sensor and its connection before replacing anything. --- **[Read on the site: BlueStar BSDF oven showing F40 | OvenRepair.center](https://ovenrepair.center/error-codes/bluestar-f40/)** **[Book a visit with OvenRepair.center](https://ovenrepair.center/schedule/)**