Dixell/Copeland F01 Error Code

What does Dixell/Copeland F01 mean?

On the Dixell IC70CX iChill controller, F01 selects the evaporator fan operating mode. Four modes are available: C_n (fan runs with compressor, off during defrost), o_n (fan always on, off during defrost), C_Y (fan runs with compressor, on during defrost), and o_Y (fan always on, including during defrost). The correct mode depends on the application — chiller units typically use C_n or C_Y while some applications require continuous fan operation.

Symptoms

• Fan continues running during defrost when it should be off (F01 = C_Y or o_Y but application requires fans off during defrost).
• Fan stops when compressor stops but application requires continuous air circulation (F01 = C_n but o_n needed).
• Defrost not clearing ice effectively due to fans blowing cold ambient air across the coil (F01 = o_Y on an outdoor unit).

Common causes

• F01 set to incorrect mode during commissioning for the specific application.
• System modification (e.g., change from chilled water to direct expansion) requiring a different fan mode.
• Controller replacement without restoring the original F01 setting from commissioning records.

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Diagnostic steps

1. Identify required fan operating mode for the application

   Review the system design specification or OEM documentation to determine whether fans should run continuously or only with the compressor, and whether they should run during defrost.

2. Check current F01 setting

   Access the F parameter sub-menu on the IC70CX and view the current F01 value: C_n, o_n, C_Y, or o_Y.

3. Set F01 to the correct mode

   Change F01 to match the application. Use C_n for compressor-interlocked fans with defrost shutoff, o_n for continuous fans with defrost shutoff, C_Y for compressor-interlocked fans that run during defrost, or o_Y for always-on fans including during defrost.

4. Verify F02 fan stop temperature

   F02 sets the evaporator temperature below which the fan is switched off. Confirm F02 is correctly set to prevent fan operation when evaporator temperature is too low (typically to protect against icing on evaporator fans).

5. Test fan behavior across operating modes

   Cycle the unit through compressor on, compressor off, and defrost states to confirm the fan behaves correctly in each state per the F01 setting.

When to call a professional

F01 is a commissioning parameter — changes require understanding of the full system design. If the IC70CX is part of a chiller installation and fan mode changes affect system performance or zone temperatures, involve the commissioning engineer or a licensed HVAC/R technician who is familiar with the installation.