How to Fix Amana Refrigerator Error OPEN THERMISTOR

Error Code: OPEN THERMISTOR Difficulty: Hard

Problem: The freezer or refrigerator thermistor circuit is open, the wiring to the thermistors is open, or the L.V. board has failed. Indicator lights 4 through 7 will sequence until “ALARM OFF” is pressed.

How to Fix OPEN THERMISTOR Error (Step-by-Step)

1. Unplug the refrigerator from the wall outlet to completely disconnect the power.
2. Locate the thermistor in the compartment (refrigerator or freezer) that is experiencing issues. It is a small sensor, usually behind a plastic cover on the interior back or side wall.
3. Carefully remove the cover and disconnect the thermistor’s wire harness.
4. Set a multimeter to the ohms setting (Ω) and touch the probes to the thermistor’s electrical contacts. An infinite resistance or ‘OL’ reading indicates a failed, open thermistor.
5. If the thermistor has a valid resistance reading, inspect the wiring harness that connects it to the main control board for any visible breaks, corrosion, or loose connections.
6. If the thermistor and wiring are in good condition, the failure is likely on the low-voltage (L.V.) control board, which will require replacement.
7. Replace the identified faulty part (thermistor, harness, or board), reassemble the components, and restore power to the unit.
8. Turn the appliance off, wait about 2 minutes, then turn it back on.

Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.

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