Error code reference

Marvel Freezer Error Code E4

Display thermistor fault

Display thermistor fault - the display thermistor is open, shorted, disconnected, or out of range.

First step from the service manual

Check if display thermistor is disconnected, then check if thermistor is unplugged on UI board, check for broken pin in harness connector, check thermistor resistance.

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

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Step-by-step tests with expected resistance, voltage, and continuity values
Wiring diagram references and connector pinouts from the OEM service manual
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E4 on my Marvel Freezer

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Display thermistor fault - the display

From Service Manual 431373, p.25:

1.Check if display thermistor is disconnected, then check if thermistor is unplugged on UI board, check for broken pin in harness connector, check thermistor resistance.

2.Disconnect the sensor and measure resistance at the sensor body. Expected: 10 kΩ to 12 kΩ at 77°F (25°C).

3.Check the sensor harness for opens and shorts. Back-probe the sensor pins at the control board connector; a reading outside 5 kΩ to 50 kΩ indicates a failed sensor.

Part WP8577274

Temperature thermistor

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First step from the service manual

Get the full diagnostic procedure for E4.

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