Dixell/Copeland AL07 Error Code

What does Dixell/Copeland AL07 mean?

The AL07 alarm on the Dixell IC100CX iChill controller signals a water flow deactivation alarm — the digital input for water flow has dropped out (gone inactive) for longer than the time configured in parameter AL05. This alarm uses the deactivation time threshold to distinguish between a real flow loss event and a brief flow interruption, protecting the evaporator from freeze damage when flow is lost.

Symptoms

• AL07 displayed on the IC100CX controller screen.
• Flow icon lit on the display.
• General alarm relay activates.
• Compressor operation may be suspended to protect the evaporator circuit.

Common causes

• Evaporator pump stopped running unexpectedly — motor failure or power loss.
• Flow switch contact opened due to debris passing through the switch body.
• Water loop pressure drop causing intermittent flow switch dropout.
• Wiring fault on the flow switch digital input causing intermittent open circuit.
• AL05 delay parameter set too short for the installation.

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Diagnostic steps

1. Check evaporator pump status

   Confirm the pump is running and drawing normal current. If the pump has stopped, identify the cause — check for overload trips, blown fuses, or a VFD fault display.

2. Test flow switch operation

   With the pump running, measure across the flow switch contacts with a multimeter. The contacts should be closed (continuity) with flow present. An open reading with flow indicates a failed or misadjusted switch.

3. Inspect flow switch for debris

   Remove and inspect the flow switch paddle or target for debris, scale, or corrosion that could prevent it from latching in the closed position with normal flow.

4. Check digital input wiring

   Trace the flow switch wiring to the IC100CX digital input terminal. Look for loose screws, corroded contacts, or a damaged cable that may cause intermittent open circuits.

5. Reset the alarm and verify

   With pump running and flow switch confirmed closed, navigate to AlrM on the IC100CX, select AL07, and execute a manual reset. Confirm the flow icon extinguishes and no re-alarm occurs.

When to call a professional

Engage a licensed HVAC/R technician if the water pump motor requires repair or replacement, if the flow switch is mounted in a pressurized water system requiring draining before removal, or if the alarm recurs despite flow being confirmed present — indicating a controller input card fault or wiring insulation failure.