What F5 Means
F5 flags a control-board relay or communication fault — the board isn't correctly coordinating with one or more induction zones, which can disable just the affected zone or lock out the entire cooktop surface depending on the model.
Common Causes of F5
- Failed relay on the control board
- Loose or corroded connector between the board and a zone module
- Control board damage from a power surge
🔧 One Safe Check You Can Try
Power-cycle at the breaker for a couple of minutes; if F5 returns as soon as you try to use the cooktop again, that confirms a genuine board-level fault rather than a one-time glitch.
⚠ Why You Shouldn't Go Further Than That
- The control board coordinates every zone on the cooktop — opening it up without proper diagnostic equipment risks damaging a board that might otherwise be repairable.
- Whether the fault is the board itself or a connector feeding it isn't something to guess at, since the parts and cost differ significantly.
- Panel access beneath the cooktop can affect your remaining warranty coverage — check your terms first.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.