Error code E16 appears and the refrigerator may overcool or undercool, with erratic compressor cycling.

Safety first: Disconnect mains power before accessing control components.

Steps:

• 1. Verify temperature readings: Place an accurate thermometer in both compartments and compare to the set temperatures and display readings.
• 2. Inspect control knob or panel: On mechanical models, ensure the thermostat knob is not cracked or slipping on the shaft. On electronic models, verify that changes on the panel are registered.
• 3. Access thermostat: For mechanical thermostats, remove the control housing inside the fridge and inspect the thermostat and capillary tube. For electronic models, access the main PCB and temperature control section.
• 4. Replace faulty control: If the thermostat does not switch the compressor on/off correctly or E16 persists, replace the thermostat (mechanical) or main control board (electronic) with the correct Fagor part.
• 5. Recalibrate (if applicable): Some electronic boards may require a reset or calibration procedure as per the service manual after replacement.