Bosch HDI8056U 800 Series 30 in Induction Slide-In Range Er4 Error Fix: Incompatible Cookware Detected

Error code Er4 on the Bosch HDI8056U 800 Series 30 in Induction Slide-In Range means: Incompatible Cookware Detected. The induction sensor has detected cookware that is not compatible with induction heating. Induction cooktops require ferrous (magnetic) cookware. Test your cookware with a magnet — if a magnet sticks firmly to the bottom, the pan is induction-compatible. Aluminum, copper, glass, and most stainless steel cookware will not work. The pan must also be the correct size for the cooking zone — pans that are too small may not be detected. Cast iron, enameled cast iron, and magnetic stainless steel are compatible.

The most successful fix is "Calibrate or Replace Induction Sensor Board" (medium difficulty, ~45 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

This error is rated low severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Calibrate or Replace Induction Sensor Board") is rated medium difficulty and takes about 45 minutes. Tools needed: T20 Torx screwdriver, Multimeter.

DIY cost: $10-$20. Professional repair typically costs $180-$250. Many homeowners save money by trying the top-ranked community fix first.

The Bosch HDI8056U 800 Series 30 in Induction Slide-In Range has 8 other known error codes, including: E011 (Oven Temperature Sensor Open), E012 (Oven Temperature Sensor Shorted), E013 (Oven Maximum Temperature Exceeded), E015 (Door Lock Fault — Self-Clean), E016 (Door Lock Timeout), and 3 more.

Error code Er4 also appears on 2 other Bosch models: HII8056U 800 Series 30 in Induction Range with Home Connect, HIS8655U 800 Series 36 in Induction Cooktop. The fix may vary by model, so check each model's specific page for tailored repair steps.