Freezer interior too cold; food excessively hard or ice cream rock solid even at moderate setting

Safety first: Unplug the freezer before accessing controls.

Steps:

• Adjust temperature: Raise the temperature setting one or two steps and monitor for 24 hours.
• Check for continuous running: Listen to see if the compressor runs almost all the time. Continuous running with very low temperature indicates a control issue.
• Test thermostat (mechanical): Follow F3 steps to test and replace the thermostat if it does not cycle off.
• Test sensor (electronic): Follow E1 steps to test the cabinet NTC sensor. Replace if out of specification.
• Board replacement: If thermostat/sensor are good but the compressor never cycles off, the main control board relay may be stuck and require replacement.