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ALr 17 - How the 'NTC Failure' alarm works

If the main temperature sensor probe, or condenser temperature probe, inside a cooler stop working, the SCS Controller can switch off the compressor to protect the asset and trigger an alarm (ALr 17).

Review the fault logic for the "NTC Failure" alarm in the following graph:

'NTC Failure' alarm

Possible causes and actions

Either the main temperature sensor probe or the condenser temperature probe (if fitted) has failed. The temperature probe needs replacing. The system will not run while this fault is present. 

  1. Replace the temperature probe.