ER21 indicates a temperature sensor malfunction or thermal detection issue on your Asko cooktop. This error prevents the cooktop from operating safely as it cannot accurately monitor cooking surface temperature.
• Cooktop will not heat or refuses to turn on
• Heating elements remain inactive despite control panel input
• Error code ER21 displays on the digital control panel
• Burners may cycle on and off intermittently
• No response when attempting to adjust temperature settings
• Cooktop shuts down unexpectedly during cooking
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Possible Causes
• Faulty temperature sensor beneath the cooktop surface
• Loose or disconnected wiring to the thermal sensor (common in USA 240V models)
• Sensor calibration drift due to power fluctuations on household circuits
• Corrosion or damage to sensor contacts from moisture or cooking spills
• Control board failure preventing proper sensor communication
• Power supply inconsistency affecting sensor readings (120V/240V compatibility issue)
• Cooktop surface damage exposing or damaging internal temperature detection components
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Safety Checks You Can Do
• Turn off power at the circuit breaker serving your Asko cooktop for 60 seconds, then restore power to reset the appliance
• Verify the dedicated 240V circuit breaker for your cooktop is fully engaged and not tripped
• Inspect the cooktop surface thoroughly and wipe clean with a soft, dry cloth—remove any food debris, grease, or moisture
• Ensure no cookware or objects are blocking the cooktop vents or cooling areas
• Check that all cookware is compatible with your cooktop model (flat-bottomed cookware for induction; ferromagnetic for induction models)
• Review the control panel settings to confirm no lock features or special modes are activated
• Allow the cooktop to cool completely for at least 30 minutes before attempting to use it again
• Verify household voltage stability—if other appliances flicker or behave erratically, contact your electrician
• Do not attempt to clean under the cooktop surface or access internal sensors
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NOTE!
If the error code persists, call to schedule your service
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