Bosch electric cooktops are engineered for sleek design, responsive touch controls, and precise heat delivery, making them a trusted choice for modern kitchens. While these appliances are built for reliability, they may occasionally display error codes when internal faults or usage issues arise. These error messages are designed to help users quickly identify the source of the problem—whether it’s a power supply issue, sensor malfunction, or overheating protection triggering.
In many cases, resolving these issues may require inspecting or replacing specific Bosch electric cooktop parts, such as sensors, control boards, or power modules. Understanding what the error codes mean is the first step to restoring full function.
Understanding these codes can help you take the right steps toward resolving the issue, whether that involves a quick reset or assistance from a Bosch-certified technician. Below is a guide to the most common Bosch electric cooktop error codes, what they mean, and how to respond effectively.
D or E – General Operational Fault
Issue:
When the cooktop displays a “D” or “E” followed by a number, it indicates an operational fault or internal system error. This is often related to the control electronics, sensor malfunctions, or power irregularities affecting the cooktop’s performance.
Possible Causes:
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A temporary glitch in the touch control panel or electronic system
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Residual heat or sensor misreadings triggering safety protocols
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Interference from moisture, spills, or cookware left on control surfaces
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Fluctuations in power supply or circuit overloads
Solutions:
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Turn the appliance off and back on again using the main power switch or by resetting the circuit breaker.
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If the error was a temporary issue, the code should clear after restarting.
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If the error code reappears, make a note of the specific code displayed (e.g., E2, D3) and contact Bosch Customer Support at 1-800-944-2904 for further assistance.
dE – Demo Mode Activated
Issue:
Error code dE indicates that Demo Mode is currently active on your Bosch electric cooktop. In this mode, the cooking zones will not heat up—this setting is intended for showroom display and product demonstrations, not regular use.
Possible Causes:
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Demo Mode was accidentally enabled during setup or cleaning
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A power interruption triggered a factory reset, activating demo mode
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The cooktop was switched to demo mode during installation or transport
Solutions:
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Disconnect the appliance from the power supply for at least 30 seconds by turning off the circuit breaker or removing the fuse.
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Reconnect the power, then touch any control element on the cooktop within 3 minutes of restoring power.
This will deactivate demo mode and restore full functionality to the cooking zones.
dE – Demo Mode Activated
Issue:
Error code dE indicates that Demo Mode is currently active on your Bosch electric cooktop. In this mode, the cooking zones will not heat up—this setting is intended for showroom display and product demonstrations, not regular use.
Possible Causes:
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Demo Mode was accidentally enabled during setup or cleaning
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A power interruption triggered a factory reset, activating demo mode
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The cooktop was switched to demo mode during installation or transport
Solutions:
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Disconnect the appliance from the power supply for at least 30 seconds by turning off the circuit breaker or removing the fuse.
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Reconnect the power, then touch any control element on the cooktop within 3 minutes of restoring power.
This will deactivate demo mode and restore full functionality to the cooking zones.
F2 – Electronics Overheated
Issue:
Error code F2 indicates that the electronics beneath a specific cooking zone have overheated. As a safety precaution, the affected zone is automatically shut off to prevent damage to internal components.
Possible Causes:
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Continuous operation at high heat without adequate cooling
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Poor ventilation beneath the cooktop surface
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Internal fan malfunction or blocked airflow
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Excessive ambient temperature in the kitchen or beneath cabinetry
Solutions:
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Wait for the cooktop’s internal electronics to cool down completely.
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Once cooled, touch any control element to clear the error.
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When the message disappears and the zone is responsive again, you may resume cooking.
To help prevent overheating in the future, ensure there is adequate airflow around the cooktop and avoid extended high-heat use without breaks.
F4 – Electronics Overheated (All Zones)
Issue:
Error code F4 means the entire cooktop’s electronic system has overheated, causing all cooking zones to shut off automatically as a protective safety measure.
Possible Causes:
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Prolonged use of multiple burners at high temperatures
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Inadequate ventilation under the cooktop or around cabinetry
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Blocked or malfunctioning internal cooling system
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High ambient temperature surrounding the appliance
Solutions:
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Wait until the internal electronics have had sufficient time to cool down.
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Once cool, touch any control element on the cooktop to clear the error code.
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When the message disappears and the system is responsive, you can resume cooking as normal.
To reduce the risk of future overheating, ensure the cooktop is properly ventilated and avoid using all zones at maximum power for extended periods.
F5 – Hot Cookware Near Control Panel
Issue:
Error code F5, accompanied by a signal tone, indicates that hot cookware has been placed too close to the control panel. To protect the sensitive electronics from heat damage, the cooktop automatically switches off the affected zone.
Possible Causes:
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A hot pot or pan was positioned directly over or near the touch controls
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Oversized cookware overlapping the control area
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Radiated heat from adjacent zones transferring to the panel
Solutions:
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Remove the hot cookware from the control panel area.
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Wait a few seconds for the cooktop electronics to cool down.
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Touch any control element to clear the error message.
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Once cleared, and when the panel has sufficiently cooled, you may resume cooking.
To prevent recurrence, use cookware that fits properly within the designated cooking zones and avoid placing hot pans over the control surface.
F5 with Heat Level – Hot Cookware Detected Near Control Panel
Issue:
When error code F5 appears alongside a heat level display and is accompanied by a signal tone, it means hot cookware is positioned too close to the control panel, putting the cooktop's electronics at risk of overheating. Unlike the standard F5 error, this version serves as a warning—allowing you to act before automatic shutdown occurs.
Possible Causes:
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A large or hot pan is encroaching on the control surface
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Residual heat from cookware is radiating onto the panel
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Continuous high-heat operation near the control area
Solutions:
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Immediately remove the hot cookware from the area surrounding the control panel.
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Once the cookware is moved, the warning will clear automatically.
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You can continue cooking once the electronics are no longer at risk of overheating.
To avoid triggering this warning, ensure pots and pans are correctly centered on their cooking zones and keep the control surface clear of hot items.
F8 + H/h – Automatic Time Limitation Triggered
Issue:
Error code F8 followed by an “H” or “h” indicates that a cooking zone has been left on for an extended period without user interaction. As a safety measure, the cooktop's automatic time limitation feature has been activated, and the cooking zone has been turned off.
Possible Causes:
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A burner was operating for a long time at a consistent heat level without adjustments
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The control panel did not register any input or change during the cooking session
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The safety timer determined the maximum allowed duration had been reached
Solutions:
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Touch any control element on the cooktop to clear the message.
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Reset the desired cooking zone and heat level to continue cooking as usual.
To avoid future interruptions, interact with the cooktop periodically—such as adjusting the heat level or touching the control panel—especially during long cooking sessions.
U400 – Incorrect Supply Voltage
Issue:
Error code U400 indicates that the cooktop’s supply voltage is outside the normal operating range. This means the electrical power being supplied to the appliance is either too high or too low, which can affect its performance and potentially cause damage.
Possible Causes:
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Fluctuations or instability in your home’s electrical system
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Incorrect wiring or faulty electrical connections
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Issues with the power supply from the utility provider
Solutions:
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Contact your electrical utility provider to check for any power supply issues or voltage irregularities.
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If the power supply is confirmed stable, contact Bosch Customer Support at 1-800-944-2904 for further assistance and diagnosis.
Ensuring your cooktop receives stable, correct voltage will help maintain its reliable operation and avoid potential electronic faults.
Bosch Electric Cooktop Troubleshooting Tips
To keep your Bosch electric cooktop running smoothly and reduce the chances of error codes, follow these practical maintenance and usage tips:
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Keep the control panel clean and dry:
Residue, spills, or moisture on the touch controls can cause unintentional inputs or sensor errors. Use a soft, damp cloth and mild cleaner, avoiding excessive water or abrasive materials. -
Avoid placing cookware on the control panel:
Hot pots or pans resting near or on the control surface can trigger overheating warnings (F5) or damage the electronics. Always keep cookware centered on the designated cooking zones. -
Ensure proper ventilation around the cooktop:
Good airflow prevents overheating of internal electronics. Make sure the area beneath and around your cooktop is clear and well-ventilated to avoid triggering F2 or F4 overheating errors. -
Reset the cooktop after power interruptions or unusual behavior:
If an error code appears, try turning off the cooktop at the circuit breaker for 30 seconds, then restore power. This simple reset can clear temporary faults. -
Use cookware appropriate to the cooking zone size:
Using pans too large or too small can cause uneven heating and potential sensor issues. Match cookware diameter to the burner size for best results. -
Avoid extended continuous operation at high heat:
Long cooking sessions at maximum power can cause the cooktop to overheat and trigger safety shutoffs (F2, F4). Give the appliance periodic breaks during heavy use. -
Contact Bosch Customer Support for persistent issues:
If error codes remain after following these tips or the appliance behaves abnormally, reach out to Bosch Customer Support at 1-800-944-2904 for professional assistance.
