4-64 Alarm Codes, Descriptions and Corrective Actions µP-D Controller
CSR-20 & CSR-40, September 1999
Code Description Corrective Action
81 Compressor Temperature Sensor Failure • Check the sensor by selecting it using the View
(Check Alarm) menu. If the display shows [- - - -], the sensor is
defective or the circuit is open or shorted.
• Indicates a problem exists with this sensor
or its wiring. The sensor is reading out-of • Check the sensor by substitution. Be sure the
range; or appears to be open or shorted. sensor polarity is correct.
• Continuity check circuit wiring using a high quality
multimeter. Be sure to maintain the correct polarity
or the sensor will not work.
NOTE: Do NOT use a test light or other instru-
ment; or controller damage may result.
82 Compressor Over Temperature • Check operation of the liquid injection valve using.
(Check Alarm) “LIV” in the Controller Test submenu.
• Indicates compressor temperature sensor has • Check refrigeration system for plugged filter drier,
detected a high compressor temperature a low or high side obstruction, or low refrigerant
condition and the condition was not corrected charge.
after 5 minutes (fault condition prevented unit
restart).
NOTE: Controller display shows “PAUSE
ALM82” every 10 seconds while the
condenser fan operates to resolve the
problem during unit shutdown.
• Controller also generates alarm if high
compressor temperature/restart cycle recurs
3 times within 30 minutes.
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