3
−
26
T-364
3.10 CONTROLLER ALARM INDICATIONS
Table 3
−
6 Controller Alarm Indications (Sheet 1 of 8)
Alarm Code
Cause
Components
Troubleshooting
Corrective Actions
AL03
Loss of
Superheat
Control
Superheat has
remained below
1.66
C (3
F) degrees
for five minutes
continuously while
compressor running.
Compressor drawing
more than 2.0 amps,
compressor pressure
ratio is greater than
1.8, and Electronic
Expansion Valve
(EEV) is at 0% open.
Electronic
Expansion Valve
(EEV)
Check the operation of the
EEV using Cd41.
Replace EEV if
defective.
Evaporator
Temperature
Sensor(s) ETS &
ETS1.
Verify accuracy of
temperature sensors, refer
to Sensor Checkout
Replace ETS or ETS1 if
defective.
Evaporator Fans
Confirm fans operating
properly.
Replace fan(s) if
defective, refer to
EVAPORATOR FAN
MOTOR ASSEMBLY
AL05
Manual
Defrost
Switch Failure
Controller has
detected continuous
Manual Defrost
Switch activity for five
minutes or more.
Keypad
Power cycle the unit.
Resetting the unit may
correct problem,
monitor the unit.
If the alarm reappears
after 5 minutes replace
the keypad.
AL06
Keypad or
Keypad
Harness Fail
Controller has
detected one of the
keypad keys is
continuously activity.
Keypad or
Harness
Power cycle the unit.
Resetting the unit may
correct problem,
monitor the unit.
If the alarm reappears
replace the keypad and
harness.
AL07
Fresh Air Vent
Open with
Frozen Set
Point
The VPS is reading
greater than 0 CMH
while unit is in frozen
mode.
Vent Position
Sensor (VPS)
Manually reposition vent
and confirm using Cd45.
Refer to VENT POSITION
SENSOR SERVICE
If unable to obtain zero
reading, replace
defective VPS.
AL08
High
Compressor
Pressure
Ratio
Controller detects
discharge pressure to
suction pressure ratio
is too high.
The controller will
attempt to correct the
situation by restarting
the compressor.
Discharge
Pressure
Transducer (DPT)
Confirm accurate DPT
pressure readings, refer to
MANIFOLD GAUGE SET
Replace DPT if
defective.
AL10
(NOT USED)
AL14
Phase
Sequence
Detect Fault
Controller is unable to
determine the correct
phase relationship.
N/A
Power cycle the unit.
Resetting the unit may
correct problem,
monitor the unit.
Wiring
Check unit wiring.
Confirm pressure readings
during start-up; suction
pressure should decrease
and discharge pressure
should increase.
Correct wiring.
Current Sensor
Check Cd41, right most
digit:
If display is 3 or 4 check
compressor / sensor wiring.
If display is 5 the current
sensor is defective.
Replace current sensor
if defective.
Summary of Contents for 69NT40-561-201
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