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Error code reference

Frigidaire Washer Error Code EF5

NTC temperature for the hot water valve over the limits.

Frigidaire codesFrigidaire washer codes

NTC temperature for the hot water valve over the limits.

First step from the service manual

Hot and cold water hoses switched.

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

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What EF5 means on a Frigidaire washer

The EF5 error code on a Frigidaire washer indicates that the NTC (Negative Temperature Coefficient) thermistor monitoring the hot water inlet valve has detected a temperature reading outside of acceptable operating limits. The NTC sensor is a resistive temperature device whose resistance decreases as temperature increases. When the control board receives a signal from this sensor that falls outside the expected resistance range, it flags the EF5 fault and may halt the wash cycle to prevent damage or unsafe operation.

The most common cause of this error is reversed water supply hoses. If the hot and cold hoses are connected to the wrong inlet valves, the NTC sensor on the hot water valve will read an unexpected temperature, triggering the fault. This is particularly common after installation or after hoses have been replaced. Beyond hose reversal, a failed or out-of-range NTC thermistor, a faulty hot water inlet valve assembly, or damaged wiring in the sensor circuit can all produce this code.

Diagnosing EF5 requires first confirming that the hot and cold supply hoses are connected to their correct respective inlet ports on the back of the machine. If the hoses are correctly installed, the next step is to test the NTC thermistor for proper resistance values at a known temperature and inspect the wiring harness between the sensor and control board for continuity, shorts, or corrosion. A defective inlet valve assembly with an integrated thermistor will require replacement of that component.

Source: manufacturer service documentation.

Common causes of EF5

  1. 01

    Hot and cold water hoses reversed

    Wiring / connection

    If the hot water supply hose is connected to the cold inlet and vice versa, the NTC sensor will read an out-of-range temperature and trigger EF5. Inspect the hose connections on the back of the washer and confirm they match the labeled inlet ports.

  2. 02

    Faulty NTC thermistor

    Part replacement

    The NTC thermistor embedded in or near the hot water inlet valve can fail, producing a resistance value outside the expected range even when water temperature is normal. Testing the sensor with a multimeter at a known temperature will confirm if it has drifted out of spec or failed open or short.

  3. 03

    Defective hot water inlet valve assembly

    Part replacement

    If the inlet valve assembly includes an integrated thermistor that cannot be serviced separately, a failure in the valve body or sensor requires replacement of the entire assembly.

  4. 04

    Damaged or corroded wiring harness

    Wiring / connection

    Corrosion, pinched wires, or broken connectors between the NTC sensor and the control board can cause erratic or out-of-range resistance readings. Inspect the wiring harness and connectors for visible damage and test for continuity.

  5. 05

    Failed control board

    Part replacement

    In rare cases, the main control board may misinterpret a correct NTC signal and generate a false EF5 fault. This should only be considered after the sensor, wiring, and hose connections have been ruled out.

See the test procedure for each cause

Frequently asked questions about EF5

What does EF5 mean on a Frigidaire washer?
EF5 indicates that the NTC temperature sensor monitoring the hot water inlet valve has detected a reading outside its acceptable limits. The control board uses this sensor to verify water temperature at the hot water valve, and when the signal falls out of range, the fault code is triggered. The first thing to check is whether the hot and cold water supply hoses are connected to the correct inlet ports on the back of the machine.
How do I fix the EF5 error on my Frigidaire washer?
Start by turning off the water supply and checking the hose connections at the back of the washer. The hot water hose should connect to the hot inlet port and the cold hose to the cold inlet port. If the hoses are correct, the next step is to test the NTC thermistor on the hot water valve for proper resistance and inspect the wiring harness for damage. If the sensor or valve assembly is defective, that component will need to be replaced.
Is it safe to use my Frigidaire washer while the EF5 code is showing?
It is not recommended to continue running the washer while EF5 is active. The fault indicates the control board cannot verify a proper temperature reading at the hot water valve, which means the machine may not be managing water temperature correctly during the wash cycle. Continuing to run the machine could result in improper wash performance or, if hoses are reversed, could introduce very hot water into components not rated for it.
Will resetting my Frigidaire washer clear the EF5 error?
A power reset may temporarily clear the EF5 code, but if the underlying issue is not resolved, the fault will return when the washer attempts to use the hot water inlet again. Resetting without addressing the root cause, such as reversed hoses or a faulty thermistor, will not provide a lasting fix. Diagnose and correct the problem before relying on a reset to restore normal operation.
How much does it cost to repair an EF5 error on a Frigidaire washer?
If the fix is simply reconnecting reversed hoses, there is no parts cost involved. If the NTC thermistor or hot water inlet valve assembly needs replacement, parts typically range from $20 to $80 depending on the specific valve assembly. If a professional technician is needed, expect labor costs to add $75 to $150 or more depending on your location and service provider.

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