Dixell/Copeland F8

What does Dixell/Copeland F8 mean?

The F8 alarm on the Dixell XC1008/XC1011/XC1015 controller indicates that a secondary input-driven alarm condition — governed by parameter AF15 — has activated and the working algorithm has responded by turning on a specific output or halting regulation. When the associated digital input is disabled, the system resumes operation according to the programmed algorithm automatically.

Symptoms

• F8 displayed on the controller screen.
• Regulation output altered or compressor control interrupted.
• System recovers automatically when triggering input condition clears.
• Alarm event recorded in the controller alarm log.

Common causes

• Digital input wired to an external protection device (e.g., oil pressure switch) activating.
• Parameter AF15 time threshold exceeded by a persisting input condition.
• Wiring fault causing an intermittent open or closed state on the digital input.
• Misconfigured AF15 parameter set too short for the installation.

Diagnostic steps

1. 01

   Identify the triggering digital input

   Access the SERVICE menu and check the digital input status screen to determine which input is active. Cross-reference with the wiring diagram to identify the connected external device.

2. 02

   Inspect the external protection device

   Check the device wired to the triggering input — such as an oil pressure switch, flow switch, or external alarm contact — for correct operation. Test for continuity with a multimeter.

3. 03

   Verify wiring integrity

   Inspect control wiring to the digital input terminal for loose connections, chafed insulation, or intermittent contacts that could cause spurious triggering.

4. 04

   Check AF15 parameter setting

   Confirm the AF15 time window is set appropriately for the application. A value set too short may cause nuisance F8 alarms before the protected condition has time to self-clear.

5. 05

   Monitor for recurrence

   After clearing the condition, observe the alarm log for repeated F8 events. Recurring alarms at similar intervals indicate a pattern tied to a specific operating condition.

When to call a professional

Call a licensed technician if the triggering input is connected to a refrigerant or oil pressure safety device and continues to activate, if you cannot safely identify the wired external device without de-energizing high-voltage equipment, or if parameter changes to AF15 are required and you lack commissioning documentation for the installation.