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Error code reference

Frigidaire Refrigerator Error Code IP

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

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What the IP error code actually means

Your Frigidaire refrigerator is showing an IP error because the ice maker's control board and the main refrigerator control board are not speaking the same electronic language. This usually happens after one of those boards has been replaced with a part that is not fully compatible with the other. A technician will need to check that both boards are the correct matched versions for your model.

Diagnostic procedure

The full IP procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

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1
Confirm the fault
Power cycle the unit: switch off the breaker for 60 seconds, then restore power. If the code returns, the fault is persistent and the procedure below isolates the cause.
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Most common causes of IP

Ranked by how often they cause this code
  1. 1Mismatched replacement I/M PCB
  2. 2Mismatched replacement system controller
  3. 3Firmware version conflict after partial update
  4. 4Incorrect part installed during prior service

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Questions people ask 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.
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.
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.
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.
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.

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