Dixell/Copeland AL32 Error Code

What does Dixell/Copeland AL32 mean?

The AL32 alarm on the Dixell IC100CX iChill controller signals a condenser water flow alarm. When condenser water flow switch input is lost for longer than the time set in parameter AL30, and CO26 is not zero (indicating a condenser water pump is configured), the controller activates the alarm relay and opens the alarm output. AL32 configuration determines which operating mode — chiller, heat pump, or both — the alarm is active in.

Symptoms

• AL32 displayed on the IC100CX screen.
• Alarm relay activates; alarm icon is lit.
• Condenser water pump operation may be affected.
• System may suspend operation to protect the condenser heat exchanger.

Common causes

• Condenser water pump stopped or tripped on overload.
• Condenser water flow switch failed — contact stuck open.
• Blocked condenser water strainer reducing flow below switch threshold.
• Air trapped in the condenser water circuit.
• CO26 or AL32 parameter incorrectly configured for the installation.

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Diagnostic steps

1. Verify condenser pump operation

   Confirm the condenser water pump is running and drawing correct current. Check pump starter or drive for fault codes or overload trips.

2. Test the condenser flow switch

   With the pump running, check continuity across the condenser flow switch contacts. Contacts should be closed with adequate flow — an open reading with pump running indicates a failed or misadjusted switch.

3. Inspect condenser water strainer

   Remove and clean the condenser water circuit strainer basket. A blocked strainer reduces condenser water flow below the flow switch activation threshold.

4. Purge air from condenser circuit

   Open air vents at high points in the condenser water loop to eliminate air pockets. Air-bound circuits reduce effective water flow and prevent the flow switch from latching.

5. Verify CO26 and AL32 configuration

   Access the service menu and confirm CO26 is set correctly for the number of condenser pumps and that AL32 is set to the correct operating mode (1=chiller only, 2=heat pump only, 3=both modes).

When to call a professional

Call a licensed HVAC/R technician if the condenser pump motor requires mechanical repair, if condenser water circuit isolation is needed to service the flow switch, or if the condenser heat exchanger shows signs of scaling or fouling that require chemical cleaning.