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T-340
4–42
AL52
EEPROM Alarm
List Full
Alarm list queue is full Active Alarms
Repair any alarms in the
queue that are active. In
-
dicated by “AA”.
Clear alarms, refer to
CONTROLLER
AL53
Battery Pack
Failure
Battery voltage low
Battery
If this alarm occurs on
start up, allow a unit fit
-
ted with rechargeable
batteries to operate for
up to 24 hours to charge
rechargeable batteries
sufficiently. Once fully
charged, the alarm will
deactivate.
To clear the alarm press
the ENTER and ALT
keys simultaneously at
the startup of Cd19 (Bat
-
tery Check).
If alarm persists, replace
the battery pack, refer to
Replacement.
AL54
Primary Supply
Sensor (STS)
Invalid Supply Tem
-
perature Sensor (STS)
reading.
Supply Tempera
-
ture Sensor (STS)
Perform Pre-trip P5:
If P5 passes, no further
action is required.
If P5 fails, replace the
defective sensor as de
-
termined by P5, refer to
TEMPERATURE SEN
-
SOR Service
AL56
Primary Return
Sensor (RTS)
Invalid Return Tem
-
perature Sensor (RTS)
reading.
Return Tempera
-
ture Sensor (RTS)
Perform Pre-trip P5:
If P5 passes, no further
action is required.
If P5 fails, replace the
defective sensor as de
-
termined by P5, refer to
TEMPERATURE SEN
-
SOR Service
AL57
Ambient Sensor
(AMBS)
Invalid Ambient Tem
-
perature Sensor
(AMBS) reading.
Ambient Tem
-
perature Sensor
(AMBS)
Test the AMBS, refer to
Sensor Checkout Proce
-
.
Replace AMBS if defec
-
tive, refer to TEMPERA
-
TURE SENSOR Service
.
AL58
Compressor
High Pressure
Safety (HPS)
High pressure safety
switch remains open
for at least one minute.
High Pressure
Switch (HPS)
Test the HPS; refer to
Checking High Pressure
.
Replace HPS if defec
-
tive, refer to Sensor Re
-
Refrigeration Sys
-
tem
Check unit for air flow re
-
strictions.
Clean or remove any de
-
bris from coils.
AL59
Heater Termina
-
tion Thermostat
(HTT)
Heat Termination Ther
-
mostat (HTT) is open.
Heat Termination
Thermostat (HTT)
Check for 24 volts at test
point TP10, if no voltage
at TP10 after unit has
reached set point HTT is
open.
Replace HTT if defec
-
tive, refer to Sensor Re
-
placement
.
AL60
Defrost Tem
-
perature Sensor
(DTS)
Failure of the Defrost
Temperature Sensor
(DTS) to open.
Defrost Tempera
-
ture Sensor (DTS)
Test the DTS; refer to
Sensor Checkout Proce
-
.
Replace the DTS if de
-
fective, refer to Sensor
.
Table 4–6 Controller Alarm Indications
Alarm Code
Cause
Components
Troubleshooting
Corrective Actions