Maytag Refrigerator Error Codes — Complete Diagnosis Guide

Common Symptoms

• Error code displayed on the refrigerator control panel
• SY EF, SY CF, 1E, 1F, PO, 5E, 5F, or 6E code visible on display
• Refrigerator or freezer not cooling properly alongside an error code
• Ice maker not working with a 1E or 1F error code
• Error code returns after pressing the reset or clear button

Most Likely Causes

1. 1

   SY EF — Evaporator Fan System Error

   The SY EF code (Evaporator Fan error) indicates the main control board has detected a problem with the evaporator fan circuit — the fan that circulates cold air from the freezer evap coil throughout both refrigerator compartments. Root causes: (1) Evaporator fan motor failed — winding open or bearing seized; (2) Ice buildup blocking the fan blade — caused by a defrost system failure allowing frost to accumulate against the fan; (3) Wiring harness fault between the board and fan motor; (4) Main control board fan output circuit failure. SY EF often accompanies progressive cooling loss because without the evap fan running, neither the refrigerator nor freezer receives adequate airflow. This is the most actionable of the Maytag refrigerator error codes.

2. 2

   SY CF — Condenser Fan System Error

   The SY CF code (Condenser Fan error) means the control board has detected an issue with the condenser fan motor — the fan located near the compressor at the bottom rear of the refrigerator that exhausts heat from the condenser coils. Root causes: (1) Condenser fan motor WPW10503278 failed; (2) Debris (lint, pet hair, foreign object) blocking the fan blade; (3) Fan blade cracked or loose on the motor shaft; (4) Wiring fault between board and condenser fan. Without the condenser fan running, the compressor will overheat and shut down on thermal overload — causing complete loss of cooling. Act promptly on SY CF.

3. 3

   1E / 1F — Ice Maker Sensor Error

   The 1E or 1F error code indicates the main control board cannot read a valid temperature signal from the ice maker temperature sensor (thermistor) inside the ice maker assembly. Root causes: (1) Ice maker temperature sensor failed — resistance out of range; (2) Wiring harness fault between ice maker assembly and main board; (3) Ice maker assembly W10190961 failure (sensor is integrated into the module). The 1E/1F code does not necessarily mean no ice production — it means the board cannot confirm freezer temperature at the ice maker location. If ice production has stopped simultaneously with this code, the ice maker thermistor or module has failed.

4. 4

   PO — Power Outage (Informational, Not a Failure)

   The PO code appears on Maytag refrigerators after any interruption to power — including brief voltage fluctuations, tripped breakers, or planned power outages. It is purely informational: the refrigerator is alerting you that a power event occurred and that the temperature may have risen during the outage. PO is not a malfunction code. To clear PO: press any button on the control panel or simply wait — on most Maytag models the code clears automatically after 30–60 seconds or the next door open/close event. No repair is needed for a PO code unless it appears repeatedly with no known power interruption, which could indicate a voltage supply issue at the outlet.

5. 5

   5E / 5F — Defrost Sensor Error

   The 5E or 5F code (Defrost Sensor error) indicates the main control board is detecting an out-of-range signal from the defrost temperature sensor (thermistor) mounted on the evaporator coil assembly. Root causes: (1) Defrost thermistor failed (most common) — the small sensor clipped to the evap coil has a broken lead or drifted resistance; (2) Defrost thermostat (bimetal cutout) failed open; (3) Wiring fault in the defrost sensor circuit; (4) Evap coil severely frosted (ice blocking sensor contact). A 5E/5F code may prevent the Adaptive Defrost system from running defrost cycles correctly, leading to progressive frost accumulation and cooling loss.

6. 6

   6E — Refrigerator Thermistor Error

   The 6E code indicates the main control board is reading an out-of-range or implausible temperature signal from the refrigerator (fresh food) section thermistor. Root causes: (1) Fresh food thermistor failed — open circuit or shorted; (2) Thermistor wiring harness damaged (often at the clip where the sensor is mounted); (3) Thermistor connector corroded or loose at the board; (4) Main control board thermistor input circuit failure. A 6E code may cause the refrigerator section to run too cold (overcooling) or not cool enough because the board cannot read actual compartment temperature to regulate the damper and compressor duty cycle correctly.

Quick DIY Checks

1. 1Clear the error code and note whether it returns immediately: press any button on the Maytag control panel to clear the displayed code. On most MFI, MFT, and MSS models, pressing the Freezer Temp Up or Fridge Temp Up button clears current codes. If the PO (power outage) code appears: simply press a button or open and close the door — no further action needed. If any other code (SY EF, SY CF, 1E, 5E, 6E) returns within minutes or hours: the underlying fault is active and requires diagnosis. A code that clears and does not return for days may indicate a wiring intermittent or a prior transient event — monitor for recurrence before replacing parts.
2. 2Enter Maytag service mode to read all stored fault codes (not just the current one): on MFI2570FEZ, MFT2772HEZ, MSS26C6MFZ, and MFT2776FEZ, enter service mode by pressing and holding the Lock button for 3 seconds, then pressing the Freezer Temp Up button three times while holding Lock, then releasing. The display will show service mode indicators. Use the Freezer Temp Up button to cycle through stored fault codes — document every code before proceeding. Multiple simultaneous codes (e.g., SY EF + 5E) may indicate a shared root cause (defrost failure causing both evap fan icing and defrost sensor reading errors). The tech sheet inside the refrigerator (check the top right corner inside the fresh food section or behind the lower kick grille) lists the exact service mode sequence and code definitions for your specific model year.
3. 3Diagnose SY EF (Evaporator Fan Error): unplug the refrigerator. Open the freezer and locate the door switch (small button in the door jamb). With the unit plugged back in, hold the door switch closed — the evaporator fan behind the freezer back panel should be audible within 5 seconds. No sound = evap fan not running. Unplug the unit again, remove the freezer back panel (4–6 Phillips screws), and inspect the fan blade for ice blockage — if the blade is encased in ice, the defrost system has also failed. Manually thaw the ice (unplug for 24 hours or use a hair dryer on low heat from 6 inches away), then retest the fan. If the blade is clear but the fan still won't run: disconnect the fan motor connector and measure winding resistance — expect 50–200 ohms between motor wires; OL = failed motor, replace. If winding resistance is good: test for 12VDC at the connector from the main board — no voltage = board fan output failed.

1. 4Diagnose SY CF (Condenser Fan Error): unplug the refrigerator and pull it away from the wall. Remove the rear access panel (lower back, 4–6 screws). Locate the condenser fan motor near the compressor — inspect the fan blade for debris, lint, or pet hair wrapped around the blade or blocking the fan guard. Spin the blade by hand — it should rotate freely with minimal resistance. If it is stiff or seized: the motor bearings have failed, replace the condenser fan motor (WPW10503278, approximately $40–$70). Also inspect the wiring connector — a loose connector causes intermittent SY CF codes. With the unit plugged in (carefully — keep hands clear of moving parts), use a multimeter to verify 120VAC at the condenser fan connector when the compressor is running. Voltage present but fan not running = failed motor. No voltage = board output failure.
2. 5Diagnose 1E / 1F (Ice Maker Sensor Error): open the freezer and locate the ice maker assembly. The 1E/1F error relates to the temperature sensor integrated into the W10190961 ice maker module. Inspect the wiring harness connector at the back of the ice maker — a partially disconnected connector is the most common and easiest fix for this code. Unplug the unit, unplug and firmly re-seat the ice maker wiring harness connector, then reconnect power and check whether the code clears. If the code returns with the connector confirmed secure: unplug the unit, disconnect the ice maker harness connector, and measure resistance between the thermistor signal pins (consult the tech sheet for pin identification — typically a 2-wire sensor). At 0°F, a functional thermistor reads approximately 16,000–17,000 ohms; at 32°F, approximately 8,000–10,000 ohms. OL or near-zero resistance = failed thermistor/module, replace W10190961.
3. 6Diagnose 5E / 5F (Defrost Sensor Error): unplug the refrigerator and remove the freezer back panel (4–6 Phillips screws) to access the evaporator coil assembly. Locate the defrost sensor — it is a small plastic-bodied thermistor clipped to the evap coil, with a 2-wire connector. Also locate the defrost thermostat (bimetal disc or oval device, typically clipped to the evap coil heater). First, manually inspect: is the evap coil encased in solid ice? Solid ice confirms the defrost system has not been running — thaw manually and check if the 5E code clears. If the coil is clear: disconnect the defrost sensor connector and measure resistance — at freezer temperature (0°F), a functional sensor reads approximately 16,000–17,000 ohms; OL = failed sensor. Test the defrost thermostat separately with multimeter continuity — it should read closed (continuity) when cold. OL when cold = failed thermostat. Replace whichever component tests failed; replace both together if in doubt since they are low-cost ($8–$20 each).
4. 7Diagnose 6E (Refrigerator Thermistor Error): the fresh food section thermistor is a small sensor typically clipped to the air duct or ceiling of the fresh food compartment, connected by a 2-wire harness to the main board. Unplug the refrigerator. Locate and disconnect the fresh food thermistor connector (consult your tech sheet for the location on your model — it varies between French door and side-by-side configurations). Measure resistance: at 37°F (typical fresh food temperature), a functional Maytag refrigerator thermistor reads approximately 8,000–16,000 ohms depending on the specific sensor; OL or near-zero = failed thermistor. Thermistor replacement is a simple clip-and-plug operation — the replacement sensor (search by model number, typically $15–$30) clips to the same mounting point and plugs into the same harness. If the thermistor tests in range and the connector is secure, the 6E code may indicate a main control board thermistor input failure.
5. 8Test or replace the main control board if error codes persist after component replacement: if you have replaced the indicated sensor or motor and the same error code continues to return, the main control board (W10503278 / WPW10503278, approximately $60–$130) may have a failed input/output circuit for that specific code. Before replacing the board, verify: (1) all wiring harness connectors are firmly seated at the board; (2) there are no signs of burning or corrosion on the board terminals; (3) the replacement component was the correct part number for your model. Board replacement is warranted when: all components test good, wiring is confirmed intact, and a persistent error code points to a specific circuit the board controls.

Repair vs Replace

Recommended Tools & Parts

• Maytag / Whirlpool Condenser Fan Motor — WPW10503278

  OEM replacement condenser fan motor for Maytag MSS, MFI, MFT, and MFF series refrigerators. Resolves SY CF error codes when the motor tests seized or open-circuit. Inspect the fan blade for debris before ordering — sometimes cleaning the blade resolves SY CF without motor replacement.

  $40–$70

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• Refrigerator Evaporator Fan Motor

  Replacement evaporator fan motor for Maytag French door and side-by-side refrigerators. Resolves SY EF error codes when motor winding tests open (OL). Verify model compatibility — motor RPM and shaft size differ between configurations. Test winding resistance first (expect 50–200 ohms).

  $30–$80

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• Refrigerator Defrost Sensor / Thermistor Kit

  Replacement defrost sensor (thermistor) for Maytag refrigerators. Resolves 5E/5F error codes. Test resistance before ordering — at 0°F, functional sensor reads approximately 16,000–17,000 ohms. Often sold as a kit with the defrost thermostat; purchase together since labor cost is the same.

  $10–$25

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• Refrigerator Fresh Food Thermistor (6E Fix)

  Replacement fresh food section temperature sensor for Maytag refrigerators. Resolves 6E error codes. Clips to air duct or ceiling of fresh food compartment. Search by model number — clip style and harness length vary between French door and side-by-side models.

  $15–$30

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• Maytag / Whirlpool Ice Maker Assembly — W10190961

  OEM ice maker assembly for Maytag refrigerators. Resolves 1E/1F ice maker sensor errors when the integrated thermistor has failed. Includes the complete module with sensor, motor, and ejector. Confirm thermistor resistance out of range before replacing the full assembly.

  $50–$100

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• Maytag / Whirlpool Main Control Board — W10503278

  Replacement main control board (also sold as WPW10503278) for Maytag MFI, MFT, MSS, MFF series refrigerators. Replace after confirming all fan motors and sensors test good but error codes persist. Inspect for relay burn marks before ordering.

  $60–$130

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Links are Amazon affiliate links (tag: fixitfastai-20). Prices are estimates.

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