Dixell/Copeland E03 Error Code

What does Dixell/Copeland E03 mean?

On the Dixell XEV02D, E03 means digital input 1 (the free-of-voltage contact, i1F) is configured as bAL (block alarm) and that input is currently active. When the bAL input closes, the module immediately disables all outputs — TRIAC, compressor relay, and solenoid valve — and activates the alarm relay. The fault clears automatically as soon as the digital input opens again.

Symptoms

• Display shows 'E03'; all outputs are disabled.
• Alarm relay activates; buzzer sounds.
• Compressor and valve control both stop.
• Fault clears automatically when digital input 1 opens — no manual reset needed.

Common causes

• External safety device wired to digital input 1 has tripped (e.g., high-pressure switch, thermal overload, safety thermostat).
• Wiring fault causing digital input 1 to remain closed unintentionally.
• Parameter i1F mis-configured as bAL when an EAL (external alarm — signal only) configuration was intended.
• Intermittent contact in the field-wired safety device creating nuisance shutdowns.

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Diagnostic steps

1. Identify what is wired to digital input 1

   Consult the system wiring diagram to determine which safety device drives digital input 1 terminals. The XEV02D uses a free-of-voltage contact for this input.

2. Check the external safety device

   Test the safety device (pressure switch, overload relay, etc.) for proper operation. Confirm it has tripped legitimately and investigate the root cause of the safety trip.

3. Verify i1F parameter setting

   In the XEV02D parameter menu, confirm that i1F is intentionally set to bAL. If a signal-only alarm was intended, change i1F to EAL. Verify i1P (polarity) setting matches the contact type.

4. Inspect wiring to digital input 1

   Check terminal connections for loose wires, shorts, or moisture. A stray connection can hold the input active and trigger a permanent E03 lockout.

5. Clear fault after resolving root cause

   Once the wired safety device is restored or the wiring issue is corrected, the digital input opens and E03 clears automatically — no controller power cycle is required.

When to call a professional

If the external safety device has tripped legitimately (e.g., high-pressure cutout), a licensed refrigeration technician must investigate the system condition that triggered it before the device is reset. Do not bypass or override safety devices without determining their root cause.