4-50 Alarm Codes, Descriptions and Corrective Actions µP-D Controller
CSR-20 & CSR-40, September 1999
Code Description Corrective Action
14 Defrost Terminated by TIme Limit • Check electric heater rod operation using the
(Check Alarm) “AMPS HEATR” test in the Electrical Test submenu.
• Indicates the controller terminated a defrost • Check for correct evaporator fan operation using
cycle due to time. the “REFRG DFRST” test in the Refrigeration Test
submenu.
• Check evaporator coil sensor for correct operation.
16 Digital Input Failure • Check for other alarms, particularly sensor alarm
(Shutdown Alarm) codes.
• Indicates one or more digital inputs (sensor, • Check controller using the Microprocessor Tester.
current transformer, pressure switch, etc.)
is erratic or has failed.
25 Return and Supply Sensor Failure • Check to be sure the sensor lead connector is
(Shutdown Alarm — setpoint at -9.9 C [14.1 F] securely attached to the controller and the sensor
or above) harness is securely attached to the control box.
(Check Alarm — setpoint at -10 C [14 F] or
below) • Check for other sensor alarm codes, particularly
codes 03 and 07.
• Indicates both the return and supply sensors
have failed. • Continuity check the wiring to the temperature sen-
sors using a wiring diagram and digital multimeter.
• Sensor Check test detected an out-of-range
condition.
37 Low Refrigerant Level (Option) • Does not apply.
(Shutdown Alarm)
• This function is not used on CSR hermetic units.
38 Real Time Clock Battery Failure • Replace the battery. The battery is located behind a
(Check Alarm) small access panel on the back of the controller.
Check and reset the date/time settings as required.
• Indicates the clock battery is under voltage or
dead.
NOTE: If the battery is changed with unit On/Off
switch ON, the clock functions may not be lost.
NOTE: The data logger may lose its time Otherwise, up to 12 hours of datalogger and
setting when unit switch is turned OFF. hourmeter logs may be lost.
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