Asko gas cooktop with electronic ignition shows F40 or flashes a fault indicator; burners will not ignite.

Safety first: Turn off gas supply at the shutoff valve and disconnect electrical power before servicing. Ensure the area is well ventilated.

• Dry components: If the issue started after a spill or cleaning, remove burner caps and allow the cooktop to dry for several hours. Use a fan to speed drying.
• Check power: Verify that the cooktop is plugged in and that the outlet has power. Reset any GFCI or breaker if tripped.
• Inspect electrodes: Check each spark electrode for cracks, heavy buildup, or loose mounting. Clean gently and ensure the gap to the burner is correct.
• Inspect module: Access the ignition module under the cooktop. Check for burned spots or melted wiring. If no sparks are produced on any burner when a knob is turned to ignite, replace the ignition module.

After any gas-related repair, perform a leak check with a non-corrosive leak detector solution before restoring full operation.