--- title: "Wolf M Series wall oven showing 0B31 | OvenRepair.center" description: "What 0B31 means on Wolf M Series wall ovens, what to check before booking, and when it is not a failure at all." url: "https://ovenrepair.center/error-codes/wolf-0b31/" --- # Wolf M Series wall oven showing 0B31 The cooling fan moves air around the electronics and the oven body. ## What 0B31 actually means. The cooling fan moves air around the electronics and the oven body. 0B31 means the triac, the electronic switch that controls the upper cooling fan, reads as shorted, so the control has lost normal command of that fan. Wolf lists 0B20 as a form of the same code. Wolf oven display · also shown as 0B20 What to do when 0B31 shows on the oven ### Kind of code Fans The convection fan in the back wall, or the cooling fan that keeps the controls from overheating, did not turn at the speed the control expected. Grease on the blade or a loose connector comes first; a worn motor, and on the cooling side a blown thermal fuse, come next. ### Usually leads to Convection fan and motor repair A convection setting that bakes like a still oven, rattles or squeals, traced to the fan blade, its motor or the ring element behind it. ### Shows up as Oven Error Code The oven shows letters and numbers, beeps, and stops a cycle or refuses to start one. ### Make Wolf The cooking brand of the Wisconsin-based Sub-Zero Group, making wall ovens, convection steam ovens and speed ovens. ### Source Wolf answer: M Series oven, upper cooling fan triac shorted (0B31 or 0B20) Wolf M Series wall ovens. ## Before you book, in this order. Each step comes from Wolf's own guidance for 0B31 on its ovens. Follow it to the end: the last card says whether this is a visit. 01 Turn the breaker off for about 30 seconds and back on, then run the oven and listen for the cooling fan. 02 If 0B31 or 0B20 comes back, book a visit and avoid long high-heat sessions until then. ### Still there? It usually turns into [convection fan and motor repair](https://ovenrepair.center/services/convection-fan-and-motor-repair/). Book with the code and the model number. ### What not to do 0B31 is not about the convection fan inside the cavity that spreads heat over the food; it concerns the cooling fan that protects the controls. ## What you may notice with it. The oven problem 0B31 tends to arrive with. Answer these at the oven before anyone is booked. [All problems](https://ovenrepair.center/problems/) Before you call ### [Oven Error Code](https://ovenrepair.center/problems/oven-error-code/) [All 6 causes, cheapest first](https://ovenrepair.center/problems/oven-error-code/) Problem ### Oven Error Code 6 causes, cheapest first Where 0B31 usually leads ## Convection fan and motor repair. **Convection fan motor, blade or ring element · low to moderate.** Book a visit [What the job involves](https://ovenrepair.center/services/convection-fan-and-motor-repair/) ## Wolf ovens. The cooking brand of the Wisconsin-based Sub-Zero Group, making wall ovens, convection steam ovens and speed ovens. [Wolf oven repair](https://ovenrepair.center/brands/wolf/) More Wolf codes [1231](https://ovenrepair.center/error-codes/wolf-1231/) [2420](https://ovenrepair.center/error-codes/wolf-2420/) [0821](https://ovenrepair.center/error-codes/wolf-0821/) [5021](https://ovenrepair.center/error-codes/wolf-5021/) [6D10](https://ovenrepair.center/error-codes/wolf-6d10/) [4910](https://ovenrepair.center/error-codes/wolf-4910/) [E67](https://ovenrepair.center/error-codes/wolf-e67/) [E73](https://ovenrepair.center/error-codes/wolf-e73/) [E115](https://ovenrepair.center/error-codes/wolf-e115/) Fans on other makes [Dacor C-A2](https://ovenrepair.center/error-codes/dacor-c-a2/) [GE Profile F350](https://ovenrepair.center/error-codes/ge-profile-f350/) [JennAir F8 E0](https://ovenrepair.center/error-codes/jennair-f8e0/) [KitchenAid 4d21](https://ovenrepair.center/error-codes/kitchenaid-4d21/) [Maytag 4d41](https://ovenrepair.center/error-codes/maytag-4d41/) [Miele F60](https://ovenrepair.center/error-codes/miele-f60/) [Samsung C-A2](https://ovenrepair.center/error-codes/samsung-c-a2/) [Whirlpool F8 E0](https://ovenrepair.center/error-codes/whirlpool-f8-e0/) [All 10 codes of this kind](https://ovenrepair.center/error-codes/#family-fan) Wolf 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. Wolf 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. Wolf builds this ### Steam oven A built-in oven that adds water vapor to the cavity, alone or with convection heat, fed from a tank or a water line. ## In Wolf's own words > Cause: Upper cooling fan triac shorted [Wolf answer: M Series oven, upper cooling fan triac shorted (0B31 or 0B20)](https://www.subzero-wolf.com/assistance/answers/wolf/m-series-oven/m-series-wall-oven-fault-code-0b31) [Wolf answer: M Series oven, upper cooling fan triac shorted (0B31 or 0B20)](https://www.subzero-wolf.com/assistance/answers/wolf/m-series-oven/m-series-wall-oven-fault-code-0b31) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Wolf M Series wall ovens. ## Wolf 0B31 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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Turn the breaker off for about 30 seconds and back on, then run the oven and listen for the cooling fan. If it comes back, it needs a visit. ### Is 0B20 on my Wolf a different problem from 0B31? Wolf's page treats them together: both point to the switch that drives the upper cooling fan. Give the technician whichever form your display showed. ### My Wolf shows 0B31 but the food still cooks. Why does it matter? The cooling fan keeps the electronics around the cavity from overheating, not the food. Cooking can seem normal while that protection is not under proper control, which is why a recurring 0B31 needs a visit. --- **[Read on the site: Wolf M Series wall oven showing 0B31 | OvenRepair.center](https://ovenrepair.center/error-codes/wolf-0b31/)** **[Book a visit with OvenRepair.center](https://ovenrepair.center/schedule/)**