Dixell/Copeland F4

What does Dixell/Copeland F4 mean?

The F4 alarm on the Dixell IC100CX iChill controller is a configuration alarm that activates when CF28 is set to 1 but the corresponding digital input is not active. The controller lights the alarm icon and displays the alarm code on screen. This indicates a mismatch between what the controller configuration expects from a digital input and what is actually present at that input terminal.

Symptoms

• F4 displayed on the IC100CX controller screen.
• Alarm icon illuminated on the display.
• Digital input expected by CF28 configuration reads inactive.
• Affected function or circuit controlled by this input does not operate as configured.

Common causes

• CF28 set to 1 but the corresponding field device or external contact is not wired or not closing.
• Field device wired to the digital input has failed open.
• Wiring break or loose connection on the digital input terminal.
• CF28 accidentally enabled during commissioning or parameter change without corresponding field wiring.

Diagnostic steps

1. 01

   Identify the CF28-assigned digital input

   Access the IC100CX configuration parameters and note which digital input terminal is assigned by CF28. Navigate to the digital input status screen and confirm that input is reading inactive.

2. 02

   Inspect the wiring at the digital input terminal

   Check wiring at the IC100CX digital input terminal for the CF28-assigned input. Look for loose terminal screws, broken wire ends, or missing jumpers if a hardwired input is expected.

3. 03

   Test the field device

   Locate and test the external device wired to the CF28 digital input with a multimeter. Confirm it closes its contact under the expected operating condition.

4. 04

   Verify CF28 configuration intent

   Confirm with the commissioning documentation whether CF28=1 is intentional for this installation. If the feature it enables is not used, setting CF28=0 eliminates the alarm without field wiring changes.

5. 05

   Correct wiring or parameter setting

   Either install the correct field wiring to satisfy the CF28 digital input requirement, or set CF28=0 if the feature is not needed. Power cycle the controller and verify the F4 alarm clears.

When to call a professional

Call a Dixell-authorized commissioning technician if the purpose of the CF28 parameter is unclear from available documentation, or if the installation requires reconfiguration that affects multiple interrelated configuration parameters beyond CF28 alone.