When your Wolf steam oven shows a code, it is pointing at the part of the cycle that failed. This page lists the 34 codes we could confirm in Wolf's own owner's manuals and support articles: what each one means, the checks that are safe to do yourself, and the point where a technician should take over.
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Sunday: 10 AM to 10 PM
Diagnostic visit: $75, or $115 for a double unit.
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Covers Wolf convection steam ovens: CSO24, CSO24TE/CSO30 (2015–2022) and CSO2450/CSO3050/CSOP3050 (2022 on). Steam ovens show E-codes, and some displays pair them with an F-message; an F-message alone does not identify a single fault.
Depending on the family, the display shows a word message (L Series and legacy dual-fuel, e.g. COOL FAN, PROBE SHORTED), ERR plus a number (legacy dual-fuel), number groups such as 07 x 23 (Legacy E Series), a four-character code such as 5121 or 4A10 (M Series and 2021+ ranges), or an E-code that some steam oven displays pair with an F-message. For most codes Wolf's first step is to switch the home circuit breaker off for about 30 seconds, restore power and retest; if the code returns, Wolf directs owners to Factory Certified Service.
| Code | Meaning | What to do |
|---|---|---|
| Convection steam ovens | ||
| E01 | Control board upset by moisture or electrical interference | Check, then call if it returns |
| E02 | Control board upset by moisture or electrical interference | Check, then call if it returns |
| E03 | Incorrect process data, or moisture on the control board | Check, then call if it returns |
| E04 | Process data or software reload error | Check, then call if it returns |
| E06 | Control processor fault | Needs a technician |
| E09 | Temperature (PT) sensor or its wiring shorted | Needs a technician |
| E13 | Heating relay, temperature sensor or control fault | Needs a technician |
| E16 | Program timed out while waiting for you | Usually a quick fix |
| E17 | Food probe shorted, probe tip too hot, or socket wet | Check, then call if it returns |
| E18 | Food probe or its socket has a broken or loose contact | Check, then call if it returns |
| E25 | Climate sensor shorted, or exhaust or sensor duct blocked | Needs a technician |
| E26 | Climate sensor connection broken, or exhaust or sensor duct blocked | Needs a technician |
| E29 | Cooking compartment is not sealing | Check, then call if it returns |
| E35 | Cabinet opening around the oven is too hot | Check, then call if it returns |
| E38 | Installation niche temperature is too high | Check, then call if it returns |
| E42 | Fault needing service; Wolf gives no owner-level cause | Needs a technician |
| E44 | Steam generator heating fault or overheat protection tripped | Needs a technician |
| E52 | Water tank valve is not sealing | Needs a technician |
| E69 | Steam generator scaled, inlet valve leaking, or foam after descaling | Needs a technician |
| E70 | Steam generator scaled up, or water inlet valve leaking | Check, then call if it returns |
| E74 | Descaling problem: no descaler detected, or foam | Check, then call if it returns |
| E78 | Drain level sensor dirty or faulty (drain problem) | Usually a quick fix |
| E87 | Exhaust slide valve stuck, or its motor is faulty | Needs a technician |
| E110 | Operating system issue or moisture on the control board | Check, then call if it returns |
| E114 | Operating system or control board issue | Check, then call if it returns |
| BOILER SCALED UP, PLEASE DESCALE | Steam generator needs descaling | Usually a quick fix |
| APPLIANCE BLOCKED, DESCALING NECESSARY | Oven is blocked until it is descaled | Check, then call if it returns |
| DO NOT REMOVE WATER TANK | Hot water is still being pumped out of the boiler | Usually a quick fix |
| Convection steam ovens with touch control | ||
| E101 | Touch control lost communication with the control board | Check, then call if it returns |
| E102 | Touch control lost communication with the relay board | Check, then call if it returns |
| E103 | Operating system or board compatibility problem | Check, then call if it returns |
| E133 | Control fault; Wolf gives no specific cause | Check, then call if it returns |
| Wall ovens, ranges and steam ovens with a probe socket | ||
| PROBE? | Oven cannot detect the temperature probe | Usually a quick fix |
| Legacy convection steam ovens | ||
| E05 | Control error; Wolf gives no specific cause | Check, then call if it returns |
Safety first. Switch the appliance off at its power button and unplug it or turn off the breaker before you clean a filter or check a hose. If you smell gas, leave the home and call your gas utility from outside. If there is a burning smell, smoke, sparking or water near wiring, stop using it and keep it off until it has been checked.
Call a technician if: Code comes back after one breaker reset
Source: [2]
Call a technician if: Code comes back after one breaker reset
Source: [3]
Call a technician if: Code comes back after one breaker reset
Source: [4]
Call a technician if: Code comes back after one breaker reset
Source: [5]
Call a technician if: Code comes back after one breaker reset
Source: [7]
Call a technician if: Code comes back after one breaker reset
Source: [8]
Call a technician if: Code comes back after one breaker reset
Source: [9]
Call a technician if: Code returns when nothing is waiting for input
Source: [10]
Call a technician if: Code returns with the probe correctly inserted
Source: [11]
Call a technician if: Code returns after cleaning the socket; the probe may need replacing
Source: [12]
Call a technician if: Code comes back after one breaker reset
Source: [13]
Call a technician if: Code comes back after one breaker reset
Source: [14]
Call a technician if: Code returns with the door closed and a normal load
Source: [15]
Call a technician if: Code comes back after one breaker reset
Source: [16]
Call a technician if: Code comes back after one breaker reset
Source: [17]
Call a technician if: Code appears at all
Source: [18]
Call a technician if: Code appears at all
Source: [19]
Call a technician if: Code comes back after one breaker reset
Source: [20]
Call a technician if: Code persists after the post-descale pump-off period
Source: [21]
Call a technician if: Code returns after descaling
Source: [22]
Call a technician if: Code returns with the correct descaler added
Source: [23]
Call a technician if: Code returns after flushing the drain and cleaning the filter
Call a technician if: Code comes back after one breaker reset
Source: [26]
Call a technician if: Code comes back after one breaker reset
Source: [30]
Call a technician if: Code comes back after one breaker reset
Source: [31]
Call a technician if: Message stays after a complete descale
Call a technician if: Message does not clear after descaling
Call a technician if: Message never clears after the oven has cooled
Call a technician if: Code comes back after one breaker reset
Source: [27]
Call a technician if: Code comes back after one breaker reset
Source: [28]
Call a technician if: Code comes back after one breaker reset
Source: [29]
Call a technician if: Code comes back after one breaker reset
Source: [32]
Call a technician if: Message stays with the correct probe fully seated; the probe may need replacing
Source: [1]
Call a technician if: Code comes back after one breaker reset
Source: [6]
If a code comes back after the safe checks, or the table says it needs a technician, the fault is usually a sensor, valve, pump, motor or control board, and diagnosing it means opening the steam oven. Our technicians repair Wolf appliances across Washington, DC, Northern Virginia and Maryland, seven days a week until 10 PM. Tell us the code when you book and we bring the parts that code usually points to.
Book Wolf steam oven repair $75 diagnostic, credited toward the repair.
Every code on this page was checked against Wolf's own documentation: owner's manuals, use and care guides, support articles or Wolf technical sheets. Codes we could only find on third-party sites are left out. Meanings are paraphrased; your model's manual is the final word.
Wolf is a trademark of its owner. Appliance Surgeon is an independent repair company and is not affiliated with Wolf.