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Error code reference

Maytag Refrigerator Error Code CP

Compressor output fault detected during service mode diagnostics.

Maytag codesMaytag refrigerator codes

Compressor output fault detected during service mode diagnostics.

First step from the service manual

Enter Service Mode Option 1 to display error codes; check compressor circuit.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What CP means on a Maytag refrigerator

The CP error code on a Maytag refrigerator indicates a compressor output fault detected during service mode diagnostics. This code is specifically generated when the control system runs a diagnostic check, typically through Service Mode Option 1, and identifies an anomaly in the compressor circuit or its associated output signals. The compressor is the core refrigeration component responsible for pressurizing refrigerant and driving the cooling cycle, so a fault at this level can result in inadequate or complete loss of cooling.

The fault may originate from several points in the compressor circuit. These include the compressor motor windings themselves, the start relay or run capacitor, the compressor control board output, or wiring harness connections between the control board and the compressor. A failed start relay is one of the more frequent culprits, as it can prevent the compressor from receiving the correct start signal, causing the control system to register an output fault during diagnostics.

Diagnosing this code requires entering Service Mode Option 1 to confirm the CP code is actively stored, then systematically checking the compressor circuit. This means inspecting wiring for damage or loose connections, testing the start relay, and verifying that the control board is delivering the correct output voltage to the compressor terminals. If the compressor itself has failed internally, replacement is necessary, as internal motor faults are not serviceable.

Source: manufacturer service documentation.

Common causes of CP

  1. 01

    Faulty compressor start relay

    Part replacement

    The start relay initiates compressor operation, and if it has failed, the control board detects no proper output response from the compressor circuit. Shake the relay; a rattling sound typically confirms it has failed internally.

  2. 02

    Failed compressor motor

    Part replacement

    Internal winding failure in the compressor motor can cause the control system to register an output fault. Testing resistance across the compressor terminals will reveal open or shorted windings.

  3. 03

    Loose or damaged wiring in the compressor circuit

    Wiring / connection

    Corroded terminals, chafed wires, or disconnected connectors between the control board and the compressor can interrupt the output signal. Visually inspect all harness connections at the compressor and control board.

  4. 04

    Defective compressor control board output

    Part replacement

    If the control board is not delivering the correct voltage output to the compressor, the circuit will register a fault. This requires verifying the output voltage at the compressor connector under diagnostic conditions.

  5. 05

    Failed run capacitor

    Part replacement

    A run capacitor that has degraded or failed can prevent the compressor from starting or running correctly, causing the control system to log a compressor output fault. Capacitors can be tested with a capacitance meter.

See the test procedure for each cause

Frequently asked questions about CP

What does CP mean on a Maytag refrigerator?
The CP code on a Maytag refrigerator stands for a compressor output fault detected during service mode diagnostics. It means the refrigerator's control system ran a diagnostic check and found an issue in the compressor circuit. This can involve the compressor itself, the start relay, wiring, or the control board output. The code is retrieved by entering Service Mode Option 1.
Can I fix a CP error code on my Maytag refrigerator myself?
Some steps, like inspecting wiring connections or replacing a start relay, are manageable for a knowledgeable DIYer. However, diagnosing the control board output voltage and replacing a compressor require technical skills and specialized tools. If you are not comfortable working with electrical components, a qualified appliance technician should handle the repair.
Is it safe to keep using my Maytag refrigerator when the CP code is showing?
A CP fault code means the compressor circuit has a detected problem, which can lead to reduced or no cooling. Continuing to use the refrigerator with this code active risks food spoilage if the cooling system is compromised. It is best to address the fault promptly rather than leaving perishable food at risk.
How much does it cost to repair a CP compressor fault on a Maytag refrigerator?
Repair costs depend heavily on which component has failed. Replacing a start relay is typically on the lower end, ranging from around $10 to $50 for the part. A compressor replacement is significantly more expensive, with parts and labor potentially ranging from $300 to $700 or more depending on the model and local labor rates.
Will resetting my Maytag refrigerator clear the CP error code?
Resetting the refrigerator by unplugging it or cycling the power may temporarily clear the code from the display, but the underlying compressor circuit fault will remain. The code will return when the control system runs diagnostics again if the root cause has not been repaired. A proper repair of the faulty component is required to permanently resolve the CP code.

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