Bosch HEI8054U Error Code E118

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• Source: Official Bosch service manual
• Reviewed by: Geo Technical Editorial
• Published: March 1, 2026
• Updated: March 15, 2026
• DIY scope: Basic user checks are possible.

Error E118 on Bosch : Cooling fan fault — oven cooling fan is not operating at the required speed or h. Follow the troubleshooting steps below to diagnose and fix this range issue. ## What Error Code E118 Means on a Bosch HEI8054U Cooling fan fault — oven cooling fan is not operating at the required speed or has stopped ## What This Error Means Error code E118 on your Bosch 800 Series Slide-In Range indicates a cooling fan failure. Bosch 800 Series slide-in ranges use a dedicated cooling fan that runs during and after every cooking cycle to protect the control electronics and door components from heat damage. When the control board detects that the fan is not spinning at the required speed (or not running at all), it logs E118 and may shut down the oven to prevent control board overheating. Common causes include: a seized fan bearing, a failed fan motor winding, a wiring connector that has come loose from the fan motor, or a blocked fan vent. Bosch has also issued a technical bulletin (58300000181324) noting that on certain models, persistent E118 requires replacing both the cooling fan and the control module as a paired kit, because the fan speed monitoring circuit in the board can also fail independently. The cooling fan is typically accessible from the rear panel of the range. If the fan blades spin freely by hand but the motor does not run under power, the motor winding has failed and the fan assembly must be replaced. ## Quick Diagnostic Summary | Detail | Value | |--------|-------| | Error Code | E118 | | Severity | High | | Appliance | Bosch HEI8054U 800 Series Electric Slide-In Range | | User-Fixable | Yes | | Applicable Models | HEI8054U, HGI8054UC, HDI8054U | ## Step-by-Step Troubleshooting | Step | Action | What To Do | Expected Result | |------|--------|------------|-----------------| | 1 | Listen for the cooling fan at startup | Power on the range. Within 30 seconds, listen near the rear lower vent — you should hear a gentle fan sound. Set the oven to Bake at any temperature. The cooling fan should become audible within 1–2 minutes of the oven element energizing. If you hear nothing from the fan, it is not operating. | Cooling fan is audible running at low speed at startup; increases in speed as oven heats. | | 2 | Power off and access the cooling fan | Turn off the range at the circuit breaker. Pull the range away from the wall (disconnect the power cord and gas line if applicable). Remove the rear lower panel — typically 4–6 Phillips or Torx screws. The cooling fan assembly is mounted near the bottom of the range back, usually with 2–4 mounting screws. | Rear panel removed. Cooling fan assembly is visible with its wiring harness. | | 3 | Inspect fan blades and test for mechanical binding | Disconnect the fan motor wiring harness connector. Attempt to spin the fan blades by hand. They should rotate freely with minimal resistance. If they feel stiff, gritty, or locked, the bearing has seized — replace the fan assembly. | Fan blades spin freely by hand with no grinding or sticking. | | 4 | Test fan motor winding continuity | Set a multimeter to resistance (Ω). Test across the fan motor terminals — a healthy motor winding typically shows 10–200 ohms depending on motor type. An OL (open loop) reading indicates a failed winding. Test the 120V supply at the fan connector with the range powered on to confirm the board is sending power to the fan. | Motor winding has continuity (not OL). 120V present at fan connector when oven is running. | | 5 | Replace cooling fan assembly (and control board if required) | Order the cooling fan assembly for your exact model. If this is a repeat E118 or if the fan tested OK but E118 persists, also order the control module as a kit per the Bosch service bulletin. Install the new fan, reconnect the harness, reinstall the rear panel. Restore power and run the oven at 350°F for 15 minutes to verify E118 does not return. | New fan runs immediately when oven is powered on. E118 does not reappear during a 15-minute bake cycle. | ## Frequently Asked Questions ### Is it safe to use the oven with E118 active? No — the cooling fan protects the control board and door components from heat damage. Operating the oven without a working cooling fan risks permanent control board failure. Do not use the oven until E118 is resolved. ### The cooling fan runs after I turn the oven off — is that normal? Yes, this is expected behavior on all Bosch 800 Series slide-in ranges. The cooling fan continues to run for 5–30 minutes after the oven is turned off, until the internal temperature drops to a safe level. This is a protection feature, not a fault. ### Bosch service bulletin mentions replacing both fan and control board — do I need both? Bosch technical bulletin 58300000181324 indicates that on affected models, persistent E118 requires replacing both the cooling fan and the control module as a kit. If the fan is mechanically seized, replacing just the fan usually resolves the issue. If the fan is fine but E118 persists, the board’s fan-speed monitoring circuit has failed and the board must also be replaced. ### How long does a Bosch oven cooling fan replacement take? With basic tools (Phillips screwdriver, multimeter), the cooling fan replacement takes approximately 45–60 minutes: 10 minutes to disconnect utilities and move the range, 10 minutes to remove the rear panel, 15 minutes to swap the fan, and 15 minutes to reassemble and test. No special tools are required. --- Last Updated: March 2026 · Bosch 800 Series Electric Slide-In Range · Error Code E118 ### Is it safe to keep using my Bosch with error E118? If error E118 does not indicate an immediate safety hazard such as a gas leak, electrical short, or water flooding, you can continue limited use while monitoring the appliance. However, running the range with an active error code increases the risk of further damage. Address the underlying issue as soon as possible. For high-severity errors, disconnect the appliance and contact a qualified technician. ### How much does it cost to fix error E118 on a Bosch ? Repair costs for error E118 on the Bosch range depend on the root cause. DIY fixes such as cleaning filters, resetting the unit, or reconnecting loose wires cost nothing beyond basic tools. If a component replacement is needed, parts and labor from a certified technician are the main expenses. Contact a Bosch-authorized service provider for an accurate estimate based on your specific situation. ### What does error code E118 mean on a Bosch range? Error code E118 on Bosch range models indicates Cooling fan fault — oven cooling fan is not operating at the required speed or has stopped. This error is detected by the appliance’s internal diagnostic system and displayed to alert the user that attention is needed. Refer to the troubleshooting steps above for guidance on resolving this issue. ### Is it safe to keep using my Bosch with error E118? If error E118 does not indicate an immediate safety hazard such as a gas leak, electrical short, or water flooding, you can continue limited use while monitoring the appliance. However, running the range with an active error code increases the risk of further damage. Address the underlying issue as soon as possible. For high-severity errors, disconnect the appliance and contact a qualified technician. ### How much does it cost to fix error E118 on a Bosch ? Repair costs for error E118 on the Bosch range depend on the root cause. DIY fixes such as cleaning filters, resetting the unit, or reconnecting loose wires cost nothing beyond basic tools. If a component replacement is needed, parts and labor from a certified technician are the main expenses. Contact a Bosch-authorized service provider for an accurate estimate based on your specific situation. ### What does error code E118 mean on a Bosch range? Error code E118 on Bosch range models indicates Cooling fan fault — oven cooling fan is not operating at the required speed or has stopped. This error is detected by the appliance’s internal diagnostic system and displayed to alert the user that attention is needed. Refer to the troubleshooting steps above for guidance on resolving this issue.