Kenmore Cooktop F5 Error: Control Board Relay / Communication Fault
The kenmore cooktop f5 error is a fault signal from the control board — this guide walks through what it means, common causes, and safe diagnostic steps. What Does Kenmore Cooktop Error Code F5 Mean? F5 on a Kenmore Elite induction cooktop or Kenmore 790-series electric cooktop indicates a control board relay fault or a […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. F5 may indicate a welded relay that holds a surface element on even when the user has turned it off. Do not use the cooktop while F5 is active or has been temporarily cleared by a reset — a welded relay is a fire and burn hazard. Service the cooktop before resuming cooking.
Can I reset the code?
No. A 5-minute breaker reset may temporarily clear F5 if the cause is a loose harness connector or a transient communication glitch, but a failed or welded relay on the main control board requires physical replacement. Do not rely on repeated resets as a substitute for diagnosing and repairing the underlying fault.
When to stop immediately?
Stop if you notice: F5 returns within 2 minutes of a 5-minute breaker reset, Any zone remains hot to the touch even when the cooktop is switched off — indicating a welded relay.
Symptoms You May Notice
F5 displayed on the panel with one or all zones inoperative
Depending on the specific model, F5 may disable only the zone associated with the failed relay or lock out the entire cooktop surface. Touch controls are unresponsive while F5 is active.
Cooktop does not respond to any touch-pad input after F5 appears
When F5 is triggered by a communication breakdown between the user interface and main boards, the entire control panel becomes unresponsive — no zone activates, and even the power button has no effect until the cooktop is power-cycled.
F5 appears intermittently, clearing on its own before returning
An intermittent relay contact or marginal solder joint on the control board can cause F5 to appear briefly, then clear when the thermal expansion of the board slightly shifts the joint back into contact — only to return when the joint cools.
Touch panel LEDs flicker or dim when F5 triggers
At the moment F5 appears, the zone indicator digits and surrounding LEDs briefly flicker or drop in brightness as the user interface board loses its steady supply from the main board through the failing harness or communication line.
Possible Causes
Welded or failed relay on the main control board
The surface-element control relay on the main board has welded closed (stuck on) or failed open (stuck off). A welded relay is a safety concern because it can leave a surface element energized even when the user has switched it off.
Requires ProfessionalFailed solder joint on the control board relay
A cold or cracked solder joint at the relay footprint on the control board causes intermittent contact loss, producing a fault signal that the board interprets as a relay failure and sets F5.
Requires ProfessionalDisconnected or damaged harness between user interface and main board
The ribbon cable or wire harness connecting the touch-pad user interface board to the main control board is loose, damaged, or has a broken conductor, preventing the boards from communicating and triggering F5.
DIY PossibleSafe Checks You Can Do
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1
Perform a hard reset at the circuit breaker
Switch off the cooktop's dedicated circuit breaker for 5 minutes (not just 60 seconds — the control board capacitors need time to fully discharge). Restore power and observe whether F5 returns immediately or only after operating a zone. A clean start without F5 suggests a transient communication glitch that the reset has resolved.
A 5-minute breaker reset is more effective than a 60-second one for F5 because the longer outage ensures the control board fully re-initializes its relay state machine from scratch, rather than resuming from a cached fault state.
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2
Inspect the harness connection between the UI board and main board
Switch off the circuit breaker and lift the cooktop from its cutout. Locate the wire harness or ribbon cable running between the front touch-pad panel and the main control board on the underside of the cooktop. Disconnect and firmly reseat both ends. Check for any visible cuts, pinches, or burn marks on the cable. Restore power and test.
On 790.4xxxx Kenmore Elite models, this cable runs along the front edge of the cooktop and can be pinched if the unit was re-installed without routing the cable correctly. Confirm the cable is not kinked or trapped between the cooktop chassis and the countertop cutout edge.
Tools required
When to Call a Professional
Contact a qualified technician if:
- A surface zone continues to generate heat after the cooktop is switched off at the panel — confirmed welded relay requiring immediate service
- F5 persists after harness reseating and a full breaker reset — indicating a failed relay or board-level communication fault
- Resistance across the relay coil terminals is outside the manufacturer specification for the specific relay component on the board
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