Bosch HIS8655U 800 Series 36 in Induction Cooktop Er5 Error Fix: Induction Coil / Zone Fault

Error code Er5 on the Bosch HIS8655U 800 Series 36 in Induction Cooktop means: Induction Coil / Zone Fault. An induction heating zone has an electrical fault. The coil driver circuit, relay, or the induction coil itself may have failed. The affected zone will not heat. Try using a different cooking zone to isolate the problem. If only one zone is affected, the issue is likely the zone-specific components (induction coil, relay, or driver circuit). If multiple zones are affected, the main power board may be faulty. This requires professional service — induction systems operate at dangerous voltage and frequency levels internally.

The most successful fix is "Test and Replace Faulty Induction Coil or Relay" (hard difficulty, ~90 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

This error is rated high severity. You should address it promptly — continued use could cause damage or safety concerns.

Yes — the top-ranked community fix ("Test and Replace Faulty Induction Coil or Relay") is rated hard difficulty and takes about 90 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Nut driver set.

DIY cost: $10-$20. Professional repair typically costs $250-$400. Many homeowners save money by trying the top-ranked community fix first.

The Bosch HIS8655U 800 Series 36 in Induction Cooktop has 5 other known error codes, including: Er1 (Induction Coil Overheated), Er2 (Power Electronics Overheated), Er3 (Voltage Supply Error — Induction), Er4 (Incompatible Cookware Detected), Flashing H (Residual Heat Warning).

Error code Er5 also appears on 2 other Bosch models: HDI8056U 800 Series 30 in Induction Slide-In Range, HII8056U 800 Series 30 in Induction Range with Home Connect. The fix may vary by model, so check each model's specific page for tailored repair steps.