Safety first: Unplug the freezer before accessing the thermostat or control housing.

Steps:

Check knob and settings: Ensure the thermostat knob is not cracked or spinning freely on the shaft. Replace the knob if it does not engage properly.
Access thermostat: Remove the control housing cover inside the freezer to expose the thermostat body and wiring.
Inspect capillary tube: Look for kinks, breaks, or signs of damage to the thin sensing tube running from the thermostat to the evaporator area.
Test continuity: With the thermostat set to cold, check for continuity across its terminals. Rotate the knob and confirm that continuity switches on and off. If not, the thermostat is faulty.
Replace thermostat: Install a new Midea-compatible mechanical thermostat, routing the capillary tube carefully along the original path without sharp bends.

Note: Do not cut or sharply bend the capillary tube; it is sealed and critical for operation.

Freezer shows F3; may not maintain stable temperature

Possible Causes