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CSR-20 & CSR-40, September 1999

µP-D Controller Alarm Codes, Descriptions and Corrective Actions 4-53

Code Description Corrective Action

46 USDA 1 Sensor Failure (Option) • Check the sensor by selecting it using the View

(Check Alarm) menu. If USDA1 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.

• This sensor REQUIRES ice bath calibration. • 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.

47 USDA 2 Sensor Failure (Option) • Check the sensor by selecting it using the View

(Check Alarm) menu. If USDA2 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.

• This sensor REQUIRES ice bath calibration. • 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.

48 USDA 3 Sensor Failure (Option) • Check the sensor by selecting it using the View

(Check Alarm) menu. If USDA3 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.

• This sensor REQUIRES ice bath calibration. • 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.

Thermo King CSR-20 Series User Manual

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