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Alarm Codes, Descriptions and Corrective Actions
µ
P-D Controller
CSR-20 & CSR-40, September 1999
Alarm Codes, Descriptions and Corrective Actions
Code
Description
Corrective Action
00
No Fault
• None Required
02
Ambient 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 sensor by substitution. Be sure sensor
range; or appears to be open or shorted.
polarity is correct.
• This sensor does NOT require ice bath
• Continuity check circuit wiring using a high quality
calibration.
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.
03
Supply Air Temperature Sensor Failure
• Check the sensor by selecting it using the RET/SUP
(Check Alarm)
key (if necessary). 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 sensor by substitution. Be sure sensor
range; or appears to be open or shorted.
polarity is correct. Replacement sensor MUST be
calibrated or sensor grade set.
• Sensor Check test detected an out-of-range
condition.
• Continuity check circuit wiring using a high quality
multimeter. Be sure to maintain correct polarity or
• This sensor REQUIRES ice bath calibration or
the sensor will not work.
correct sensor grade setup.
NOTE: Do NOT use a test light or other
NOTE: If the Supply Air sensor is the
instrument; or controller damage may result.
controlling sensor when it fails, the
controller continues unit operation
using the Return Air sensor.
