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Error code reference

Frigidaire Range Error Code F5 FF

Watchdog timer timed out on UIB.

Frigidaire codesFrigidaire range codes
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What the F5 FF error code actually means

This error means the control panel circuit board on your Frigidaire range has stopped responding and locked up internally. Think of it like a computer that has frozen and needs to be restarted or replaced. In most cases, the control panel board itself has failed and will need to be replaced to restore normal operation.

Diagnostic procedure

The full F5 FF procedure

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First diagnostic step
Replace UIB.
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Most common causes of F5 FF

Ranked by how often they cause this code
  1. 1Failed User Interface Board (UIB)
  2. 2Power surge or voltage transient
  3. 3Loose or corroded wiring harness connector at the UIB
  4. 4Communication failure between UIB and main control board

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Questions people ask about F5 FF

What does F5 FF mean on a Frigidaire range?
F5 FF means the watchdog timer on the User Interface Board has timed out. The watchdog timer is a safety circuit that monitors the UIB's internal processor. When the processor stops responding normally, the watchdog trips and the range displays this fault code. The primary fix is to replace the UIB.
Will resetting my Frigidaire range clear the F5 FF error?
Power cycling the range by unplugging it or tripping the circuit breaker for a few minutes may temporarily clear the F5 FF code. However, if the UIB has an internal hardware or firmware fault, the watchdog will time out again and the error will return. A reset is useful for confirming whether the fault is intermittent, but it is not a permanent fix for a failed UIB.
How much does it cost to fix the F5 FF error on a Frigidaire range?
If the repair only requires reseating wiring connectors, the cost is minimal. If the UIB needs to be replaced, the part alone typically costs in the range of $80 to $250 depending on the specific range model. Adding professional labor, the total repair cost generally falls in the range of $150 to $400.
Can I fix the F5 FF error myself on a Frigidaire range?
A knowledgeable DIYer can attempt this repair by first inspecting and reseating the wiring harness connectors at the UIB. If reconnecting the harness does not resolve the fault, the UIB itself will need to be replaced. Replacing the UIB involves disconnecting power to the range, accessing the control panel, unplugging the harness, and swapping the board.
Is it safe to use my Frigidaire range while the F5 FF code is displayed?
A locked-up UIB means the control panel is not operating reliably, which can prevent you from controlling the range safely or accurately. It is recommended to stop using the range until the fault is resolved. Continuing to operate an appliance with a failed control board is not advisable.

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