T-318
3
−
34
Table 3-6 Controller Alarm Indications (Sheet 5 of 6)
Alarm Code
Cause
Components
Troubleshooting
Corrective Actions
AL66
(SPT) Suction
Pressure
Transducer,
(EPT)
Evaporator
Pressure
Transducer
Suction Pressure
Transducer (SPT) out
of range.
Suction Pressure
Transducer (SPT)
Confirm accurate EPT and
SPT pressure readings,
refer to MANIFOLD
GAUGE SET Section 6.2.
Performing a Pre
−
trip 5
−
9
test will also check the
transducers.
Replace EPT/SPT if
defective.
Monitor
If the alarm persists, it
may indicate a failing
compressor, refer to
COMPRESSOR
AL67
Humidity
Sensor
Humidity Sensor (HS)
reading out of range.
Humidity Sensor
(HS)
Make sure the humidity
sensor is properly connec-
ted in the socket and the
wires have not been dam-
aged.
Monitor, replace HS if
alarm persists.
AL68
CPC Pressure
Sensor (PS3)
Condenser Pressure
Transducer (CPC) out
of range.
Condenser Pres-
sure Transducer
(CPC)
NA
Unit will disable Con-
denser Pressure Control
if Configured.
AL69
Suction Temp
Sensor
(CPSS)
Suction Temperature
Sensor (CPSS) out of
range.
Suction
Temperature
Sensor (CPSS)
Test the CPSS, refer to
TEMPERATURE
SENSOR Service Section
Replace CPSS if
defective, refer to
TEMPERATURE
SENSOR Service
AL70
Secondary
Supply Sensor
(SRS)
Secondary Supply
Sensor (SRS) is out of
range.
Secondary Supply
Sensor (SRS)
Perform Pre
−
trip P5:
If P5 passes, no further
action is required.
If P5 fails, replace the
defective sensor as
determined by P5, refer
to TEMPERATURE
SENSOR Service
AL71
Secondary
Return Sensor
(RRS)
Secondary Return
Sensor (RRS) is out
of range.
Secondary Return
Sensor (RRS)
Perform Pre
−
trip P5:
If P5 passes, no further
action is required.
If P5 fails, replace the
defective sensor as
determined by P5, refer
to TEMPERATURE
SENSOR Service
AL72
Control Temp
Out of Range
After the unit goes in
−
range for 30 minutes
then out of range for a
continuous 120
minutes.
Refrigeration
System
Ensure unit is operating
correctly.
Power cycle unit.
Control Temperature is
in In
−
range.
Any Pre
−
trip mode, re-
sets the timers.