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     AL174  Circuit 1 - LP Alarm by pressure switch.  

Alarm Issue                     Circuit 1 – LP alarm by pressure switch    Operates after 45 sec delay on compressor start.  Normal function 5 sec delay
                                             
What it means             The refrigerant gas pressure is too low

Corrective Action         Check coolant water flow and ensure it is unobstructed .  Clear filter and ensure all system valves are open.  Reset the alarm by holding the alarm button down for 5 seconds before releasing. 

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