Bosch HGI8054UC Error Code E302

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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 E302 on Bosch : Control module overtemperature — internal electronics temperature exceeded safe . Follow the troubleshooting steps below to diagnose and fix this range issue. ## What Error Code E302 Means on a Bosch HGI8054UC Control module overtemperature — internal electronics temperature exceeded safe operating limit ## What This Error Means Error code E302 on your Bosch 800 Series Slide-In Range means the control module (main PCB) has detected that its own internal temperature has exceeded approximately 212°F (100°C) — the safe operating limit for the electronic components on the board. When the board’s internal temperature sensor crosses this threshold, E302 is triggered and the oven shuts down to prevent permanent PCB damage. E302 is almost always caused by insufficient cooling airflow over the control board. The most common root causes are: a cooling fan that is running at reduced speed or not running at all, blocked ventilation paths around the control electronics, or a stuck heating relay that keeps elements energized and causes higher-than-normal heat levels in the control area. Resolving E302 typically requires confirming the cooling fan is working at full speed, ensuring all ventilation paths are unobstructed, and if the fan is good, replacing the control board itself. Note that E302 and E118 (cooling fan fault) frequently occur together. ## Quick Diagnostic Summary | Detail | Value | |--------|-------| | Error Code | E302 | | Severity | High | | Appliance | Bosch HGI8054UC 800 Series Gas Slide-In Range | | User-Fixable | Yes | | Applicable Models | HEI8054U, HGI8054UC, HDI8054U | ## Step-by-Step Troubleshooting | Step | Action | What To Do | Expected Result | |------|--------|------------|-----------------| | 1 | Power off and allow full cool-down | Turn off the range at the circuit breaker. Allow the control board area to cool for at least 20 minutes before inspection. The E302 code may clear automatically after cool-down if the root cause was a temporary airflow blockage. | Range is de-energized and control board area has returned to room temperature. | | 2 | Inspect and clean control board ventilation path | Pull the range away from the wall. Remove the rear upper panel (typically 4–6 screws) to access the control board area. Inspect all vent slots and air passages around the board for accumulated dust, grease, or debris. Use compressed air to clear all vent passages. Also check that the range has adequate clearance from walls and cabinetry per installation specs (typically 1 inch sides, 0 inches rear). | All vent passages are clear. Range has correct installation clearances on all sides. | | 3 | Verify cooling fan operation | Restore power. Set the oven to Bake at 350°F. Within 1–2 minutes, listen for the cooling fan — it should be audible at low speed, increasing as the oven heats. Access Service Mode (press and hold Clock + + for 5 seconds until ‘tESt’ appears) and navigate to the Fan Test to run the fan at full speed. Confirm the fan reaches maximum RPM. | Fan runs audibly at variable speeds during bake. Fan reaches full speed in Service Mode fan test. | | 4 | Replace cooling fan if not running at full speed | If the fan runs slowly or not at all during the fan test, replace the cooling fan assembly. Power off at the breaker, remove the rear panel, disconnect and replace the fan. Reconnect, restore power, and run the fan test again to confirm the new fan reaches full speed. | New cooling fan passes the Service Mode fan test at full speed. Control board area does not overheat. | | 5 | Replace control board if E302 returns with a good fan | If the cooling fan tests good and E302 continues to appear, the control board’s own internal temperature monitoring circuit or a relay is generating excess heat. Replace the control board. Order the exact part for your model number — 800 Series boards are model-specific. After installation, run a full bake cycle at 400°F for 30 minutes to confirm E302 does not return. | New control board installed. 30-minute bake cycle at 400°F completes without E302. | ## Frequently Asked Questions ### What is the difference between E302 and E303? E302 means the control module electronics have overheated — the board’s own temperature sensor exceeded ~212°F. E303 means the oven relay module area has recorded excessive temperature, usually caused by the oven cavity overheating over time. Both involve cooling failures but target different temperature sensors in different physical locations. ### Can a room temperature over 90°F trigger E302? In very hot environments (e.g., an outdoor kitchen or a poorly ventilated room above 90°F), the ambient heat load combined with normal oven heat can stress the cooling system. Ensure the range is installed with manufacturer-specified clearances and the kitchen has adequate ventilation. If E302 appears only in summer heat, consider additional ventilation. ### How do I access the Bosch range fan test in Service Mode? Press and hold Clock + + simultaneously for approximately 5 seconds until ‘tESt’ appears on the display. Use the arrow keys to navigate to ‘FAnS’ (fan test). Press Start to run the cooling fan at maximum speed for 30 seconds. The fan should be audible at high speed during the test. Press Cancel to exit Service Mode. ### E302 appeared after I cleaned behind the range — what happened? If the range was pulled out during cleaning and the rear panel vents were obstructed or the range was pushed back without proper clearance, airflow to the control board can be restricted, causing E302 during the next cooking cycle. Ensure the rear vent area is clear and the range has proper installation clearances before the next use. --- Last Updated: March 2026 · Bosch 800 Series Gas Slide-In Range · Error Code E302 ### Is it safe to keep using my Bosch with error E302? If error E302 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 E302 on a Bosch ? Repair costs for error E302 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 E302 mean on a Bosch range? Error code E302 on Bosch range models indicates Control module overtemperature — internal electronics temperature exceeded safe operating limit. 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 E302? If error E302 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 E302 on a Bosch ? Repair costs for error E302 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 E302 mean on a Bosch range? Error code E302 on Bosch range models indicates Control module overtemperature — internal electronics temperature exceeded safe operating limit. 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.