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Alarm Code
Cause
AL52
Alarm list queue is full
EEPROM Alarm
List Full
AL53
Battery voltage low
Battery Pack
Failure
AL54
Invalid Supply Tem-
Primary Supply
perature Sensor (STS)
Sensor (STS)
reading.
AL56
Invalid Return Tem-
Primary Return
perature Sensor (RTS)
Sensor (RTS)
reading.
AL57
Invalid Ambient Tem-
Ambient Sensor
perature Sensor
(AMBS)
(AMBS) reading.
AL58
High pressure safety
Compressor
switch remains open
High Pressure
for at least one minute.
Safety (HPS)
AL59
Heat Termination Ther-
Heater Termina-
mostat (HTT) is open.
tion Thermostat
(HTT)
AL60
Failure of the Defrost
Defrost Tem-
Temperature Sensor
perature Sensor
(DTS) to open.
(DTS)
T-340
Table 4–6 Controller Alarm Indications
Components
Active Alarms
Battery
Supply Tempera-
ture Sensor (STS)
Return Tempera-
ture Sensor (RTS)
Ambient Tem-
perature Sensor
(AMBS)
High Pressure
Switch (HPS)
Refrigeration Sys-
tem
Heat Termination
Thermostat (HTT)
Defrost Tempera-
ture Sensor (DTS)
4–42
Troubleshooting
Repair any alarms in the
queue that are active. In-
dicated by "AA".
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.
Perform Pre-trip P5:
Perform Pre-trip P5:
Test the AMBS, refer to
Sensor Checkout Proce-
dure
Section
7.24.1.
Test the HPS; refer to
Checking High Pressure
Switch,
Section
7.9.1.
Check unit for air flow re-
strictions.
Check for 24 volts at test
point TP10, if no voltage
at TP10 after unit has
reached set point HTT is
open.
Test the DTS; refer to
Sensor Checkout Proce-
dure
Section
7.24.1.
Corrective Actions
Clear alarms, refer to
CONTROLLER
ALARMS
Section
4.6.
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
Section 7.23.5
Battery
Replacement.
If P5 passes, no further
action is required.
If P5 fails, replace the
defective sensor as de-
termined by P5, refer to
TEMPERATURE SEN-
Section
SOR Service
7.24.
If P5 passes, no further
action is required.
If P5 fails, replace the
defective sensor as de-
termined by P5, refer to
TEMPERATURE SEN-
Section
SOR Service
7.24.
Replace AMBS if defec-
tive, refer to TEMPERA-
TURE SENSOR Service
Section
7.24.
Replace HPS if defec-
tive, refer to Sensor Re-
placement,
Section
7.24.
Clean or remove any de-
bris from coils.
Replace HTT if defec-
tive, refer to Sensor Re-
placement
Section
7.24.2.
Replace the DTS if de-
fective, refer to Sensor
Replacement
Section
7.24.2.
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Table of Contents
Troubleshooting
