Dixell/Copeland AEP1

What does Dixell/Copeland AEP1 mean?

The AEP1 alarm on the Dixell IC100CX EVO iChill controller is an evaporator water pump 1 maintenance reminder. It activates when Evaporator Pump 1 has accumulated operating hours exceeding the configured maintenance interval. This is a non-locking warning — the pump and compressor continue to operate normally. AEP2 is the equivalent alarm for Evaporator Pump 2.

Symptoms

• AEP1 displayed on the IC100CX EVO controller screen as a maintenance warning.
• Pump and compressor operation continues normally — no shutdown occurs.
• Warning persists until the pump hours counter is manually reset.
• Alarm icon may illuminate to draw attention to the maintenance notification.

Common causes

• Evaporator Pump 1 cumulative operating hours have reached or exceeded the maintenance interval threshold.
• Maintenance hours counter was not reset after the previous scheduled service.
• Maintenance interval parameter set shorter than the intended service interval.

Diagnostic steps

1. 01

   Perform evaporator pump maintenance

   Complete scheduled maintenance on Evaporator Pump 1 per the pump manufacturer's guidelines — including inspection of seals, bearings, impeller, coupling, and motor electrical connections.

2. 02

   Check pump bearing condition

   Listen for abnormal noise (grinding, squealing) from the pump motor and bearings. Check for shaft play or vibration that indicates bearing wear. Replace bearings if worn.

3. 03

   Inspect pump seals and connections

   Check mechanical seals for leaks, inspect water-side fittings for corrosion, and verify all electrical connections to the pump motor are tight and corrosion-free.

4. 04

   Reset the pump hours counter

   Access the IC100CX EVO service menu, navigate to the evaporator pump 1 hours counter, and reset it to zero after completing all maintenance tasks.

5. 05

   Verify maintenance interval parameter

   Confirm the maintenance interval parameter for AEP1 is set to the value specified in the pump manufacturer's maintenance schedule — typically 4,000 to 8,760 hours depending on pump type and application.

When to call a professional

Call a licensed HVAC/R technician or pump specialist if bearing replacement requires pump removal from the water circuit, if mechanical seal replacement is needed (involves isolating and draining the evaporator water loop), or if the pump motor shows signs of winding degradation requiring insulation testing.