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Error code reference

Frigidaire Refrigerator Error Code IP

Invalid Protocol

Frigidaire codesFrigidaire refrigerator codes

Invalid Protocol – detected when the version of I/M pcb does not match version of 2500++ system controller.

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What IP means on a Frigidaire refrigerator

The IP error code on a Frigidaire refrigerator stands for Invalid Protocol. This fault is generated when the Ice Maker control board (I/M PCB) and the main 2500++ system controller are running incompatible firmware or hardware versions. The two boards communicate over a serial data protocol, and if the version handshake between them fails, the system controller flags the mismatch and displays the IP code. This is a communication-level fault rather than a sensor or mechanical failure.

The 2500++ system controller is the central processing unit governing refrigerator functions, while the I/M PCB manages ice maker operations. For these boards to work together correctly, they must be designed to operate on matching communication protocol versions. A mismatch can occur when one board is replaced with a part that carries a different firmware revision, or when a field update is applied to one board but not the other.

This fault does not indicate a failed compressor, sealed system issue, or temperature problem. It is strictly a control board compatibility issue. Resolving it typically requires verifying that both the I/M PCB and the main system controller are compatible part revisions. In some cases, one board must be replaced with a version that matches the other, or both boards may need to be updated together as a matched set.

Source: manufacturer service documentation.

Common causes of IP

  1. 01

    Mismatched replacement I/M PCB

    Part replacement

    If the ice maker control board was recently replaced, the new board may carry a different protocol version than the existing main system controller. Verify the replacement part is the correct revision for your specific model.

  2. 02

    Mismatched replacement system controller

    Part replacement

    If the main 2500++ system controller was replaced, the new board may not be protocol-compatible with the existing I/M PCB. Cross-referencing both board revision numbers is necessary to confirm compatibility.

  3. 03

    Firmware version conflict after partial update

    Wiring / connection

    If a firmware or software update was applied to one board but not the other, the protocol versions can fall out of sync. Both boards must be on compatible versions to communicate properly.

  4. 04

    Incorrect part installed during prior service

    Part replacement

    A previous repair may have used a close but not exact substitute board. Even boards that physically fit may run incompatible protocol versions, triggering this fault.

See the test procedure for each cause

Frequently asked questions about IP

What does IP mean on a Frigidaire refrigerator?
IP stands for Invalid Protocol on a Frigidaire refrigerator. It means the ice maker control board and the main 2500++ system controller are not running compatible communication protocol versions. This is a control board compatibility fault and is not related to temperature, sealed system, or mechanical components. A technician needs to verify that both boards are matched to the correct revisions for your model.
Can I fix the IP error code on my Frigidaire refrigerator myself?
Resolving the IP error requires identifying which board, the I/M PCB or the main system controller, is carrying the wrong protocol version. This involves cross-referencing board revision numbers, which can be difficult without access to model-specific compatibility data. Most homeowners will need a qualified appliance technician to correctly identify and replace the incompatible board. Swapping a board with another incorrect revision will not resolve the fault.
Will resetting my Frigidaire refrigerator clear the IP error code?
A power reset will not clear the IP error code in any lasting way. Because the fault is caused by a hardware or firmware version mismatch between two control boards, the error will return every time the boards attempt to communicate. The underlying incompatibility must be corrected by replacing the mismatched board with the correct revision before the code will stop appearing.
Is it safe to use my Frigidaire refrigerator while the IP error code is displayed?
The IP code is specific to the communication between the ice maker board and the main system controller. The refrigerator's core cooling functions may continue to operate normally while this fault is active. However, ice maker operation may be impaired or disabled until the issue is resolved. It is still advisable to have the fault addressed promptly to avoid further control board communication issues.
How much does it cost to repair the IP error code on a Frigidaire refrigerator?
Repair costs depend on which board needs to be replaced and current parts pricing. A replacement I/M PCB or main system controller for a Frigidaire refrigerator generally ranges from $75 to $300 or more for the part alone. Adding professional labor, total repair costs typically fall in the range of $150 to $500 depending on your location and the specific boards involved. Getting a diagnostic visit from a technician first will clarify exactly which component needs to be replaced.

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