What F4E Means
Bertazzoni's own induction hob manual states F4E indicates a "mainboard temperature sensor failure" — the sensor that monitors heat at the power electronics board itself isn't reporting a reading the control system can trust.
Common Causes of F4E
- A failed temperature sensor built into or mounted on the mainboard
- Heat stress on the mainboard from a failing cooling fan or blocked ventilation
- Damaged wiring between the sensor and the rest of the board
🔧 One Safe Check You Can Try
There isn't a safe DIY check for this — Bertazzoni's own manual lists the remedy as replacing the mainboard, which is de-energized, high-current electronics work best left to a technician.
⚠ Why You Shouldn't Go Further Than That
- Bertazzoni's own manual points straight at mainboard replacement for this code, and that board carries the cooktop's high-current power electronics.
- This can be mistaken for the separate F3E coil-sensor fault, and buying the wrong, similarly priced part is a common, costly mistake.
- The mainboard sits in the electronics bay directly beneath the glass, and reaching it without full de-energization is a shock risk.
- A cooling fan that's actually the root cause won't be fixed by a mainboard swap alone, and skipping that check can mean the new board overheats too.
- Opening the electronics bay for this repair typically voids the remaining warranty on the cooktop.