Koolance ERM-3K4U5 - Manual (Page 27)

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8. The LED Display Panel shows 5 - 0 (“S - 0”) or 5 - 5 (“S - S”)...
Your Koolance LED display may specify if there is a problem with the cooling
unit. Please use the following guide in determining the cause of a problem:
5 - 0 : Sensor open. This indicates that the temperature sensor may be dis-
connected or faulty. If the sensor can not be detected, the cooling system
alarm will sound. The sensor will need to be reconnected inside the unit,
or else replaced. Please visit our support web page for contact information.
5 - 5 : Sensor short. This indicates that the sensor may be faulty
or electrically bypassed. If the sensor is listed with an “S-S” status,
the cooling system alarm will sound. The sensor will need to be re-
placed. Please visit our support web page for contact information.