How to troubleshoot error code F90 on a Frigidaire range

If you’re reading this, chances are that your Frigidaire range is showing an F90 error code on its display screen. But don’t worry – you’re not alone! The F90 code is a common one that you can troubleshoot yourself, without the need for an expensive service call.

If you find out that you need any replacement parts for your Frigidaire range while you’re troubleshooting, you can enter your model number at AppliancePartsPros.com to order them. Most orders arrive in just two business days, and we have thousands of free guides to show you how to install your new parts.

Disclaimer: The error code information provided in this article is based on general service manuals and may not apply to your specific appliance model. While we strive to offer helpful advice for DIY appliance repairs, variations in models and configurations can lead to differences in troubleshooting steps, error codes and part replacements. For the most accurate guidance, we strongly recommend consulting the technical sheet for your specific appliance model.

Read more:  6 safety tips for using an electric range

Safety tips

When working on any appliance, remember to keep safety first. Here are some tips to keep in mind:

• Always power off and unplug your appliance or switch off the circuit breaker before you attempt any maintenance or replacement work. This keeps you safe by preventing any risk of electric shock.
• If the appliance has recently been used, give it plenty of time to cool down before working on it.
• If you have a gas model, shut off the gas supply to prevent any leaks while you work.
• Take your time while working to prevent accidents and personal injuries. Rushing is the enemy of precision.
• Work in a well-lit area so you can see and access appliance parts.
• Keep your workspace free of clutter and other obstacles. Keep children and pets away from the work area.
• Never work on internal parts with wet hands. Make sure the work area is completely dry.
• Check the user manual to see if there are specific installation or safety instructions related to your appliance or replacement part.
• Be gentle when handling or removing parts. Excessive force might damage the appliance or cause personal injury.
• Wear insulated work gloves to protect your hands from sharp metal parts and debris.
• When working with wires, avoid touching any exposed wires or terminals. If you need to touch a wire, use a non-conductive tool or wear insulating gloves to prevent electrical shock.
• Always take photos or make a note of wiring terminals or other connections before disconnecting them to make reassembly easier.
• Don’t test live voltage with a multimeter if you’re unfamiliar with how to prevent short-circuiting.

Read more: How to fix a stuck bottom drawer on a range

How to troubleshoot the F90 error

Resolve the F90 fault code by following the steps below.

Step 1: Check the wiring connections

1. Unplug the range from the power outlet.
2. If you have a gas model, shut off the gas supply.
3. Pull the range out to access the back.
4. Remove the screws and take off the top and bottom back panels of the range.
5. Check the wiring connections between the control board and the oven door lock assembly. Reconnect any loose wires and replace any broken or damaged ones.

If you find and fix a broken or disconnected wire, reassemble the range and restore power to it. You should hear the door lock motor run when you plug it in to indicate that it’s locking or unlocking the door.

If the wiring connections look OK, move on to the next step.

Step 2: Check the door lock switch

1. Disconnect the wire harness plug from the control board.
2. Set a multimeter to continuity, which looks like a sideways WiFi symbol.
3. Use the meter probes to test the switch and its wiring, with the switch arm pushed in and then extended. Check the continuity between the wires on the wire harness plug.
4. Reverse the position of the switch arm and check for continuity again.

If there’s continuity (the meter should make a beeping sound) with the arm pushed in and a reading of OL (open line) with the arm extended, then the switch and its wiring are good.

If there’s continuity or an OL reading regardless of the arm position, either the switch or the wiring is faulty. You’ll need to disconnect the wires from the switch spades and repeat the continuity test directly on the switch spades. Replace the switch if the reading remains the same. If the reading changes, replace the wiring.

If the door lock switch and its wiring are good, continue to the next step.

Step 3: Check the oven door lock motor

1. Set your multimeter to measure resistance (Ω).
2. Use the meter probes to measure the resistance through the wires that connect to the control board.
3. Check the meter reading. The multimeter should measure about 3,600 Ohms if the motor is functioning correctly.

If the resistance measurement is good, then the door lock switch, motor, and wiring wouldn’t be causing the F90 code. By the process of elimination, you would know that the control board has failed, so you would need to replace the board.

If you got a bad resistance measurement, then unplug the wires from the motor and use the meter probes to measure the resistance across the motor spades. If the multimeter doesn’t show about 3,600 Ohms, you’ll need to replace the oven door lock assembly.

If the resistance measurement is good through the motor but bad between the motor and the control board, check the wiring between the motor and the control board. Set the multimeter to continuity and check for continuity between the wires. The multimeter should make a beeping sound and show continuity if the wires are OK. If the meter doesn’t beep or show continuity, replace the wiring as needed.

After testing and making repairs, reassemble the range, plug the power cord back in, and slide the range back into the cabinet. The F90 code should disappear and the door should finish locking or unlocking. Unlock the door if it’s locked and reset the clock.

Read more: Electric Range Little to No Heat When Baking: Top 5 Reasons and Fixes

Additional information

Thank you for reading! We hope this guide helped you get your Frigidaire range working again.

If you have any other appliance repair needs or projects, don’t hesitate to explore our other troubleshooting guides and videos.

If you need replacement parts or some extra help with ordering them, grab your model number and head over to AppliancePartsPros.com, where you can chat with a pro, read our DIY blog and more.

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