Common Chiller Problems.

As an example please find below the commons alarm code faults on the Refcool V15 chiller Carel Controller  and what associated action can be taken to fix/repair

Alarms screen and LEDs 

Pressing the ALARM (Top left corner) key can occur in two different situations - no alarm or an alarm present.
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This screen makes it possible to easily enter the alarms log using the ENTER key.

If there is at least one alarm, the alarms screen is displayed sorted by alarm code from lesser to greater. 
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Each alarm contains the information needed to understand the cause of the alarm. 
The information available in the screen is shown below:

1. Alarm number/total alarms; 
2. Unique alarm code; 
3. Alarm date and time;
4. Long alarm description;
5. Value of the probes linked to the alarm;

In every alarm screen, the alarms log can be displayed by pressing ENTER.

The red LED under the ALARM button can be:

• Off: no active alarm;
• Flashing: there is at least one active alarm and the display shows a screen that is not part of the alarms loop.
• On: there is at least one active alarm and a screen that is part of the alarms loop is displayed.   

It is important to scroll back and see all the alarms that have occurred from a single event.  

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Alarm     AL008  User Pump Overload 

Alarm Issue                     Unit -  User Pump Overload 
                                             
What it means               The fuse protection on the pump has been activated 

Corrective Action        Manually reset the pump overload.  Given that you have the training and experience to safely open the chiller.  Switch off the chiller at the main switch, open the electrical cabinet and reset the the Pump Overload.  Rest alarm by holding the alarm button for 5 seconds and the releasing. 

If problem persists      Inform a qualified service engineer of the alarm and get them  to attend site and diagnose issue with the pump.