E8 error induction hob: 5 causes and detailed solutions

Error E8 on induction cookers often appears with a “beep” sound and the LED screen displays the code “E8”, causing users to worry and interrupting cooking tasks. In fact, this is an intelligent mechanism designed to protect the copper coil and internal power circuit. The following article from Köcher will provide common causes of E8 errors on induction cookers and detailed troubleshooting methods at home.

What is E8 error on induction cookers?

E8 error is usually a overheating warning code, indicating that the temperature inside the components or on the glass surface of the cooker has exceeded the safe limit. When this issue is detected, the self-protection system will immediately activate to cut off the power supply, preventing damage to important components such as the power circuit or induction coil.

However, the E8 error code on electric cookers is not entirely consistent across brands, which can easily lead to misunderstandings when users look it up:

• Overheating group: For brands like Mitsubishi, Faster, or Electrolux, E8 is a warning of excessively high temperatures due to continuous cooking at high power or ineffective cooling systems.
• Communication error group: Conversely, for some European brands, the E8 code sometimes indicates a conflict in communication signals between the control circuit and the power circuit (internal connection error).
• Voltage group: Some electric cookers show E8 errors when the input power supply encounters abnormal issues or is incompatible with the rated voltage range of the cooker.

5 common causes of E8 error on induction cookers

To effectively resolve this issue, users need to understand the root causes from a technical perspective. Here are the 5 main causes of E8 errors on induction cookers:

Signal conflict between circuits

• Cause: Signal conflict errors are often due to loose, broken, or oxidized signal cables caused by a humid environment. Additionally, a malfunctioning communication IC or power component on the circuit board that prevents signal transmission is also a common reason.
• Error mechanism: To ensure safety, the cooker will activate the E8 code and cut off all power to the coil. The control circuit and power circuit continuously exchange data to operate the cooker. When the signal flow is interrupted or deviates, the system cannot confirm a safe status, leading the microcontroller to stop supplying power and issue an error warning to protect the device.

Overheating of the induction coil

• Cause: This error often occurs due to using excessively high power for an extended period or using pots with very thin bottoms, leading to high temperatures. Additionally, cooking dishes with little water (such as frying or stir-frying) or leaving a pot empty on the cooker can also overload the induction coil. To understand more about the structure and heating principle of this component, you can refer to the section What is an induction coil? Learn about types of induction heating coils to choose the device with the best insulation durability.
• Error mechanism: If the temperature exceeds the tolerance of the insulation layer (usually above 250 degrees Celsius), the sensor will send an emergency signal to the circuit board to cut off power, preventing melting or explosion of the induction coil.

Faulty temperature sensor

• Cause: This error arises from a broken wire, short circuit, or aging components of the temperature sensor after prolonged use. Additionally, insects nesting and dirtying the contact pins of the sensor on the circuit board can also cause this component to send incorrect information.
• Error mechanism: The temperature sensor operates like a thermometer, transmitting voltage signals to the microcontroller to report the heat of the cooker. When the sensor is faulty, it will send false signals (too high or too low compared to reality); since it cannot determine whether the actual temperature is safe or dangerous, the system will cut off all operations and report error E8 to prevent the risk of fire or explosion.

Faulty cooling fan

• Cause: The fan may be stuck due to dirt, grease buildup over time, or damaged bearings or fan motor. The phenomenon Induction cooker fan not running is a direct cause of interrupting the airflow cycle under the built-in cooker.
• Error mechanism: When the fan does not spin or spins insufficiently, the convective airflow cannot dissipate heat from the heat sink of the power module (IGBT). The temperature at the IGBT skyrockets in a short time (reaching 85 – 90 degrees Celsius), immediately activating the temperature sensor to report error E8.

Aging circuit components

• Cause: The power filter capacitors and voltage regulator ICs on the circuit board may become “dry” or lose capacity after many years of operation in high temperature and humidity environments.
• Error mechanism: Aging components cause the voltage supplied to functional ICs to become unstable (voltage drop or pulse noise). When the operating voltage deviates from the manufacturer’s safe rated range, the system will report error E8 to protect other components inside the induction cooker.

Quickly fix E8 error on induction cookers

When encountering this error code, you should perform the following technical checks:

• Turn off the cooker: Press the power button on the cooker, but do not cut off the power supply immediately. Let the cooling fan continue to run for another 5 – 10 minutes to cool the components.
• Check ventilation: Ensure that the air intake and exhaust vents at the bottom of the cooker are not obstructed by plastic bags, fabrics, or items in the kitchen drawer.
• Clean the fan system: If you notice the fan spinning slowly or making loud noises, use a mini vacuum or soft brush to clean the dust stuck on the fan blades.
• Check the cooking pot: Try switching to a set of pots with thick, flat bottoms and good magnetic properties to see if the error code still appears.
• Restart: After the cooker has completely cooled down (about 15 – 20 minutes), turn it on and try again at medium power.

If you have followed the above steps and the cooker still reports an error, this may be an issue related to the circuit board. At this point, you need to contact a reputable warranty center for technicians to repair or replace the components.

Notes to minimize E8 error on electric cookers

To avoid the occurrence of E8 errors on induction cookers, users should pay attention to the following technical rules:

• Use the Booster mode correctly: Only use the Booster mode for a maximum of 10 minutes, then switch to medium power immediately. Continuous cooking at maximum power causes components to accumulate heat quickly, easily leading to E8 errors due to induction coil overload.
• Check the compatibility of the pot bottom: Place a magnet under the pot; if the magnet sticks tightly to the bottom of the pot, it is magnetic and compatible with the induction cooker.
• Install a dust filter at the air vent: You can add a thin dust filter mesh at the air intake of the fan and clean it every 3 – 6 months to prevent grease from directly adhering to the internal control circuit board.
• Avoid placing the cooker near other heat-generating devices: Do not place the induction cooker directly above the oven or next to the refrigerator. The resonating heat from surrounding devices will reduce the effectiveness of the internal cooling system, easily leading to E8 error codes in the summer.
• Regularly check the cooling fan: Listen to the sound of the fan when it operates. If there are strange noises like “buzzing”, “clicking”, or the fan spins intermittently, it needs to be cleaned or replaced immediately to ensure that the internal components are always cooled during cooking.
• Do not cut off power immediately after cooking: After turning off the cooker, you should not unplug it or immediately cut off the circuit breaker. Wait at least 5 – 10 minutes for the cooling fan to cool the copper coil and internal components, helping to quickly bring the system back to a safe temperature.

Frequently Asked Questions

What is E8 error on induction cookers?

E8 error is a warning code for overheating components or a communication error between the circuits. The cooker automatically shuts off to protect the induction coil and power circuit when it detects that the component temperature exceeds the threshold or the internal connection signal is interrupted. For devices using new generation digital ICs, when the touch control area is flooded or the panel processing circuit fails, the code induction cooker reports error e9 will be activated to display as a replacement, helping users identify software errors instead of overheating issues.

Why does the cooker report E8 error even after just a few minutes of cooking?

Usually due to the cooling fan being stuck, broken, or the air vent being obstructed, causing the temperature to spike. Additionally, using pots with very thin bottoms or continuously cooking at Booster level can also easily trigger this error code.

What is the most effective way to handle E8 error at home?

Turn off the cooker (keep the power on) to let the fan cool down. Clean the dust in the air vent and fan. Wait 15 – 20 minutes for the cooker to cool down completely before restarting at low power.

Hopefully, the above article has helped you understand the nature of the E8 error on induction cookers, while helping users to be more proactive in controlling and maintaining stability in the kitchen. Adhering to installation standards and regularly checking the cooker not only helps the induction cooker operate stably but also protects important components inside the device.

With a foundation of German standard components, especially the cooling fan system and thick heat sink, Köcher induction cookers operate stably, minimizing E8 errors on the device.