Step-by-Step DIY Fix Guide
- SAFETY: Turn off power to the oven at the circuit breaker before touching any internal wiring.
- Attempt a power reset: turn off the breaker for 1 full minute, then restore. F3 / F20 / F26 caused by transient glitches will clear with a reset.
- If the code returns, turn the breaker off again. Remove the back panel of the oven control console (usually 2–4 screws) to access the wiring harness connectors.
- Locate the ribbon cable or harness connector between the main control board and the UI board. Disconnect and firmly reseat it.
- Inspect connector pins for corrosion (green or black discoloration) or burn marks. Gently clean corroded pins with a pencil eraser, or replace the connector harness if burnt.
- Restore power and test. If F3 / F20 / F26 persists, call a technician to identify which board has failed.
If the code comes back
- F3, F20, or F26 returns after a 1-minute power reset and harness inspection
- Connector pins are visibly burnt — do not attempt to use the oven with burnt wiring
What This Error Means
Error F3 on your Frigidaire oven means: The oven's main control board has lost communication with one of its subsidiary boards — typically the user interface board (UI board) or an auxiliary control module. F20 and F26 cover specific communication bus faults within this same category and are treated identically. The oven will not operate until communication is restored. Also displayed as F20, F26 on some Frigidaire models. The oven's self-diagnostic system has detected this condition and restricted operation.
The most frequent cause is loose or disconnected wiring harness connector between the main board and ui board — most common cause after vibration or service work. Work through the causes and fix steps below in order — many Frigidaire oven errors are resolved with a power cycle or a simple part swap.
Many cases of F3 can be resolved by the homeowner using the steps below. If the DIY checks do not resolve the error, a technician is needed.
Communication faults between Frigidaire oven control boards are often caused by loose harness connectors — particularly after the range has been moved or serviced. A power cycle and a harness reseat resolves the majority of F3 faults without replacing any boards.
Most Likely Cause by Symptom
The Frigidaire oven may stop, pause, or refuse to complete the cycle normally.
Likely cause: Loose or disconnected wiring harness connector between the main board and UI board — most common cause after vibration or service work
Check first: SAFETY: Turn off power to the oven at the circuit breaker before touching any internal wiring.
The warning may return immediately because the appliance is detecting an internal fault.
Likely cause: Corroded or burnt connector pins on the communication harness
Check first: Attempt a power reset: turn off the breaker for 1 full minute, then restore. F3 / F20 / F26 caused by transient glitches will clear with a reset.
Common Causes
- Loose or disconnected wiring harness connector between the main board and UI board — most common cause after vibration or service work
- Corroded or burnt connector pins on the communication harness
- Transient control board fault cleared by a power cycle
- UI board (user interface / touch control panel board) has failed
- Main control board has failed
What Not to Do
- Do not operate the oven when a communication fault is active — the control board cannot safely regulate temperature without communication to the UI board
Model and Display Variation Notes
Model-family notes
- Frigidaire oven display wording and code formats can vary by series.
- If your model behaves differently, check the owner manual before trying any deeper maintenance step.
- Some models may display the same fault as F3, F20, F26.
Display and panel differences
- Some control panels show this issue as F3, F20, F26 instead of only F3.
- Panel wording and whether the code appears with letters, numbers, or a longer variant can differ by model family.
Parts, Tools and Service Options
Common parts
- User interface (UI) board ($60–$150)
- Main control board ($100–$250)
- Wiring harness connector if pins are burnt or corroded ($15–$40)
Manual and model check
Check your exact model and manual before ordering any Frigidaire oven parts.
Service option
Frigidaire service visit if the warning returns after the basic checks are complete.
Suggestions in this section are organized to support the troubleshooting flow first. Any future affiliate relationships should be disclosed clearly.
When Not to Keep Troubleshooting
F3, F20, or F26 returns after a 1-minute power reset and harness inspection
- Connector pins are visibly burnt — do not attempt to use the oven with burnt wiring
How to Prevent It Recurring
- When pulling the oven out for cleaning or servicing, avoid tugging on the power cord — excess strain on the wiring behind the range can loosen harness connectors and cause communication faults
Related Error Codes
F1
The oven's control board has detected a stuck or shorted key on the keypad. One or more buttons on the control panel are registering as continuously pressed, preventing the oven from operating normally. This may be caused by physical damage to the keypad overlay or an internal failure of the touchpad membrane.
F13
The oven's control board has detected a failure in the EEPROM (non-volatile memory) chip that stores calibration data, settings, and operational parameters. The board cannot read or write to this memory reliably, which prevents normal oven operation. F12 and F13 are used interchangeably across different Frigidaire and Electrolux model years to indicate the same EEPROM fault.
Extra notes
- This page is based on Frigidaire support material and stays conservative where model-specific guidance may vary.
- The goal is to help you identify safe first checks before you move into parts, service, or model-specific manual lookup.
Source and model notes
Last reviewed: 2026-04-09
Based on: Based on Frigidaire support material and edited into consumer-safe guidance for the exact code family on this page.
View Frigidaire US Official Support
Model coverage note: Frigidaire oven code meanings can vary by series, control panel, and model family, so use this page as a safe starting point rather than a replacement for the model-specific manual.
Important: FixThisError is an independent guide, not the manufacturer. Use your model-specific manual when the panel wording or behavior differs.
Always disconnect power before inspecting appliances. If unsure, contact a licensed appliance technician.