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.  ​

Alarm     AL012  User Pump 1 No Flow (Flow Switch) 

Alarm Issue                     Unit -  User Pump 1 No Flow (Flow Switch)
                                             
What it means             The flow switch has activated because there is no flow.   

Corrective Action        Check coolant water flow and ensure unobstructed  - To do this clear filter and ensure unobstructed,  ensure any valves on the cooling circuit are open.  Reset the alarm by holding the alarm button for five seconds and then releasing.  

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