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3 − 32 T-364
Table 3 − 6 Controller Alarm Indications (Sheet 7 of 8)
Alarm Code Cause Components Troubleshooting Corrective Actions
AL65
Discharge
Pressure
Transducer
(DPT)
Compressor
Discharge Transducer
is out of range.
Compressor
Discharge
Transducer (DPT)
Confirm accurate DPT
pressure readings, refer to
MANIFOLD GAUGE SET
Section 6.2.
Replace DPT if
defective.
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
Service Section 6.8.
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.
Make sure the humidity
sensor wires have not been
damaged.
Monitor, replace HS if
alarm persists.
AL69
Evaporator
Temp Sensor
(ETS1)
Evaporator Temperat-
ure Sensor (ETS1) out
of range.
Evaporator Tem-
perature Sensor
(ETS1)
Test the ETS1, refer to
Sensor Checkout Proced-
ure Section 6.13.2.
Replace Evaporator
Temperature Sensor
(ETS1) if defective.
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
Section 6.22.
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
Section 6.22.
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.