Display shows L1 and the cabinet temperature is significantly lower than the setpoint, risking over-chilling wine.

Safety: Disconnect power before accessing the control board or sensors.

• Verify setpoint: Confirm that the temperature setting has not been accidentally lowered. Adjust to the recommended range for your wines.
• Check ambient conditions: If the cooler is installed in a very cold environment, the control may behave unpredictably. Ensure ambient temperature is within Blastcool's specified range.
• Test temperature sensor: Compare the displayed temperature with an independent thermometer inside the cabinet. If the display is inaccurate, inspect and test the cabinet NTC sensor (see E1).
• Observe compressor cycling: If the compressor runs almost continuously even when the cabinet is very cold, the compressor relay on the main PCB may be stuck closed.
• Replace faulty parts: Install a new Blastcool cabinet NTC sensor if misreading. If the relay is stuck, replace the Blastcool main control PCB.
• Monitor: After repair, monitor cabinet temperature for 24 hours to ensure stable operation and that L1 does not recur.

Over-chilling can damage wine; if you cannot quickly resolve L1, switch the cooler off and store valuable bottles temporarily elsewhere until serviced.