4-6
Status Indicator LEDs and Alarm Codes
µ
P-D Controller
CSR-20 & CSR-40, September 1999
PWRED
Power Reduction Mode Setting and Enable
RCOMP
Remote Cool Indicator
RDEF
Remote Defrost Indicator
REFRG
Refrigeration Test Submenu
RET
Return Air Temperature Sensor
RETG
Return Air Sensor Grade
RIR
Remote In-range Indicator
RSP
Remote Spare Indicator
SENSR
Sensor
SETPT
Setpoint Temperature
SLS
Suction Line Solenoid Valve
SOT
Start of Trip
SPR1
Spare Temperature Sensor 1
SPR1G
Spare Sensor 1 Grade
SPR2
Spare Temperature Sensor 2
SPR2G
Spare Sensor 2 Grade
SPR3
Spare Temperature Sensor 3
SPR3G
Spare Sensor 3 Grade
SPR4
Spare Temperature Sensor 4
SPR4G
Spare Sensor 4 Grade
SPR5
Spare Temperature Sensor 5
SPR5G
Spare Sensor 5 Grade
STEST
Single Pretrip Test Submenu
SUP
Supply (Discharge) Air Temperature Sensor
SUPG
Supply Air Sensor Grade
TD
Temperature Differential
TEMP
Temperature
TEST Test
Menu
TIME
Current Time 1
UHMT1
User Hourmeter 1 Threshold
UHMT2
User Hourmeter 2 Threshold
UHMT3
User Hourmeter 3 Threshold
UHMT4
User Hourmeter 4 Threshold
UHRM1
User Hourmeter 1 Hours
UHRM2
User Hourmeter 2 Hours
UHRM3
User Hourmeter 3 Hours
UHRM4
User Hourmeter 4 Hours
UNIT
Unit
USDA
USDA Logging Enable
USDA1
USDA1 Temperature Sensor 1 (USDA Enabled)
USDA2
USDA2 Temperature Sensor 2 (USDA Enabled)
USDA3
USDA3 Temperature Sensor 3 (USDA Enabled)
USN
Unit Serial Number
USNXX
Unit Serial Number Character 01, 02, 03 ...10
(total number of characters)
VERSN
Software Version
VIEW
View Menu
VOLTS
Total Voltage
YEAR
Current Year
Status Indicator LEDs and Alarm Codes
The indicator LEDs stay ON continuously to indicate a unit
operating mode or condition. The Alarm LED stays ON con-
tinuously when a Check Alarm occurs. The Alarm LED flash-
es ON and OFF when a Shutdown Alarm occurs. LEDs are
located on the
µ
P-D controller and signal the following:
• Cool Mode
• Modulation Mode
• Null Mode
• Heat Mode
• In-Range (Temperature)
• Defrost Mode
• Supply (Air Temperature)
• Return (Air Temperature)
• Power Limit Mode
• Alarm
Alarm Codes
Check Alarms indicate corrective action should be taken
before a problem becomes severe. The unit continues to oper-
ate. However, some unit functions may be inhibited.
Shutdown Alarms indicate the unit operation has been
stopped to prevent damage to the unit or cargo. The problem
must be corrected and the alarm code cleared from the con-
troller display before the unit can be restarted to resume nor-
mal operation.
Alarm codes are recorded in the controller memory to
simplify unit diagnosis and troubleshooting procedures. The
first 16 fault codes including the most recent fault code are
retained by the controller in a non-volatile memory in order of
their occurrence (see codes, alarm type and alarm description
below). Alarm codes that are recorded during an automatic
Pretrip Test are recorded in the controller memory and dis-
played with a hyphen (-) preceding the alarm code. Alarm
codes 52 through 58 can only be generated during an automat-
ic Pretrip test (or Fitness test).
