Freezer display shows F01 and unit may not start or may shut down shortly after powering on.

Safety first: Unplug the freezer from the mains before removing any panels. Do not work on live circuits.

Step-by-step checks:

• Power reset: Disconnect the freezer from the wall socket for at least 10 minutes to allow the control board capacitors to discharge. Plug back in and check if F01 clears.
• Inspect mains cable and plug: Check the Indesit freezer's power cord and plug for burn marks, cuts, or looseness. Replace the plug or cord if damaged.
• Access the main PCB: On most Indesit upright freezers, the main control board is located in a rear lower compartment behind a metal or plastic cover. Remove the screws and gently pull off the cover.
• Check wiring harnesses: Verify that all connectors to the main PCB (power input, compressor relay, fan, thermistors, display harness) are fully seated and not corroded. Reseat each connector one by one.
• Look for board damage: Examine the PCB for burnt components, bulging capacitors, or cracked solder joints, especially around the compressor relay and power supply section.
• Test supply voltage: With a multimeter and extreme caution, confirm that the board receives correct mains voltage at the input terminals (only if you are trained to work on live circuits; otherwise skip this and call a technician).

If the error persists: The EEPROM or logic section of the main PCB is likely faulty. The usual remedy is to replace the complete main control board with the correct Indesit part number for your model. This typically requires transferring the wiring harnesses one by one to the new board.