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Error code reference

Maytag Refrigerator Error Code EO

Open thermistor detected by electronic control board.

Maytag codesMaytag refrigerator codes

Open thermistor detected by electronic control board.

First step from the service manual

Check thermistor resistance; replace if open.

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

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What EO means on a Maytag refrigerator

The EO error code on a Maytag refrigerator indicates that the electronic control board has detected an open circuit condition in a thermistor. A thermistor is a temperature-sensing resistor whose resistance value changes predictably with temperature. The control board continuously monitors this resistance to determine the temperature inside the refrigerator or freezer compartment and uses that data to regulate compressor cycles and fan operation. When the board reads an open circuit rather than an expected resistance value, it triggers the EO code and may limit or halt normal cooling operations.

An open thermistor typically means the sensor has failed internally, breaking the electrical circuit completely. This is different from a short circuit failure. A properly functioning thermistor will show a measurable resistance value, while an open thermistor will show infinite or no continuity when tested with a multimeter. The failure is most often caused by physical damage to the sensor, degradation of the thermistor element over time, or a break in the wiring harness connecting the sensor to the control board.

Diagnosis begins by locating the thermistor in the refrigerator compartment or near the evaporator, then disconnecting it and measuring its resistance with a multimeter. If the meter reads infinite resistance (open loop), the thermistor requires replacement. Technicians should also inspect the wiring harness for breaks, fraying, or corrosion at connector pins, since a damaged harness can produce the same open circuit reading even when the thermistor itself is intact.

Source: manufacturer service documentation.

Common causes of EO

  1. 01

    Failed thermistor

    Part replacement

    The thermistor element itself has degraded or broken internally, producing an open circuit. Testing the sensor with a multimeter will show infinite resistance rather than a normal reading.

  2. 02

    Broken or damaged wiring harness

    Part replacement

    The wire connecting the thermistor to the control board may be broken, frayed, or pinched, interrupting the circuit. Visually inspect the harness from the sensor to the board and check for continuity.

  3. 03

    Corroded or loose connector

    Wiring / connection

    Moisture inside the refrigerator compartment can corrode the connector pins where the thermistor harness plugs into the control board or a wiring junction. Inspect connectors for oxidation, bent pins, or loose seating.

  4. 04

    Control board fault

    Part replacement

    In less common cases, the electronic control board itself may have failed and is incorrectly reading the thermistor circuit as open even when the sensor and wiring are intact. This is typically diagnosed after the thermistor and harness have been confirmed good.

See the test procedure for each cause

Frequently asked questions about EO

What does EO mean on a Maytag refrigerator?
The EO code means the electronic control board has detected an open circuit in a thermistor, which is the internal temperature sensor. The board is not receiving any resistance reading from the sensor, which prevents it from accurately monitoring compartment temperature. This typically points to a failed thermistor or a break in the wiring harness connected to it.
Can I fix the EO error code myself?
A knowledgeable DIYer can diagnose this code by locating the thermistor, disconnecting it, and testing its resistance with a multimeter. If the reading shows infinite resistance, the thermistor is open and needs to be replaced. Wiring harness inspection and connector cleaning are also tasks that can be performed without specialized tools, though control board replacement is better left to a technician.
Is it safe to keep using my Maytag refrigerator while the EO code is displayed?
It is not advisable to rely on the refrigerator for food storage while the EO code is active. Without a functioning thermistor, the control board cannot properly regulate cooling cycles, which means the unit may over-cool, under-cool, or behave unpredictably. Perishable food could be at risk, and continued operation without the sensor may put additional strain on the compressor.
Will resetting the refrigerator clear the EO code?
A power reset may temporarily clear the EO code from the display, but the code will return if the underlying thermistor fault has not been corrected. Because the control board actively monitors the thermistor circuit during operation, it will detect the open condition again within a short time and redisplay the error. A permanent fix requires replacing the faulty sensor or repairing the wiring.
How much does it cost to repair an EO error code on a Maytag refrigerator?
If only the thermistor requires replacement, parts typically cost in the range of $15 to $50 depending on the model, making it one of the more affordable refrigerator repairs. If a technician is hired for diagnosis and installation, total costs including labor generally fall in the $100 to $250 range. Control board replacement, if the board is determined to be at fault, is significantly more expensive and can range from $200 to $400 or higher.

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