Amana Refrigerator Error Code THERMISTOR ALARM

The THERMISTOR ALARM means the control board has detected an open circuit in either the freezer or refrigerator compartment thermistor. The thermistor is a temperature sensor the refrigerator uses to monitor and regulate internal temperatures. When this circuit breaks, the alarm sounds and temperature indicators 4 through 7 illuminate in sequence on the display. The fault must be diagnosed by checking the thermistor resistance and the associated wiring.

Operating the refrigerator with an active thermistor alarm carries some risk, because the control board may not be able to accurately regulate temperatures in the affected compartment. Food safety could be compromised if the compartment temperature rises without the board detecting it. It is best to check the compartment temperature with a separate thermometer and address the fault promptly.

Once the open circuit in the thermistor or wiring has been repaired and the circuit continuity is restored, the control board should recognize a valid temperature signal and the alarm condition should clear. Pressing the Alarm Off pad can silence the alert during diagnosis. If the alarm persists after the circuit is repaired, the control board input may need to be evaluated.

You can silence the alarm by pressing the Alarm Off pad on the control panel. However, this only mutes the alert and does not fix the underlying open circuit in the thermistor or its wiring. The alarm will return if the fault is not corrected. A proper repair requires testing the thermistor resistance and inspecting the wiring harness.

Repair costs vary depending on whether the thermistor itself, the wiring, or another component is at fault. A replacement thermistor typically costs in the range of $15 to $50 for the part alone. If professional labor is required, total repair costs including diagnosis and labor can range from $100 to $250 or more depending on your location and service provider.