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4–31
T-359
Table 4–6 Controller Alarm Indications
CODE #
CAUSE
COMPONENTS
TROUBLESHOOTING
CORRECTIVE ACTIONS
AL03
Loss of
Superheat
Control
Superheat has re-
mained below 1.66
C
(3
F) degrees for five
minutes continuously
while compressor run-
ning. Compressor
drawing more than 2.0
amps, compressor
pressure ratio is great-
er than 1.8, and Elec-
tronic Expansion
Valve (EEV) is at 0%
open.
Electronic Expan-
sion Valve (EEV)
Check the operation of
the EEV using Cd41.
Replace EEV if
defective.
Evaporator Tem-
perature Sen-
sor(s) ETS &
ETS1.
Verify accuracy of tem-
perature sensors, refer to
Sensor Checkout Proce-
dure
.
Replace ETS or ETS1
if defective.
Evaporator Fans
Confirm fans
operating properly.
Replace fan(s) if defective,
refer to
EVAPORATOR FAN MO-
TOR ASSEMBLY
AL05
Manual
Defrost
Switch
Failure
Controller has detect-
ed continuous Manual
Defrost Switch activity
for five minutes or
more.
Keypad
Power cycle the unit.
Resetting the unit may cor-
rect problem, monitor the
unit.
If the alarm reappears af-
ter 5 minutes replace the
keypad.
AL06
Keypad or
Keypad
Harness Fail
Controller has detect-
ed one of the keypad
keys is continuously
activity.
Keypad or
Harness
Power cycle the unit.
Resetting the unit may cor-
rect problem, monitor the
unit.
If the alarm reappears re-
place the keypad and har-
ness.
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 Sen-
sor (VPS)
Manually reposition vent
and confirm using Cd45.
Refer to VENT POSI-
TION SENSOR SER-
VICE Section.
If unable to obtain zero
reading, replace defective
VPS.
AL08
High
Compressor
Pressure Ra-
tio
Controller detects dis-
charge pressure to
suction pressure ratio
is too high.
The controller will at-
tempt to correct the sit-
uation by restarting
the compressor.
Discharge
Pressure
Transducer (DPT)
Confirm accurate DPT
pressure readings, refer
to MANIFOLD GAUGE
SET
.
Replace DPT if defective.
AL10
CO
2
Sensor
Failure
Alarm 10 is triggered
when the CO
2
sensor
voltage is operating
outside of the 0.9 v to
4.7 v range, or if the
sensor is out of range.
This is a display
alarm and has no
associated failure
action.
Refer to eAutoFresh
manual.
The alarm is triggered off
when voltage is within op-
erating range.
Summary of Contents for 69NT40-561-019
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Page 128: ...T 359 8 4 Figure 8 3 UNIT WIRING DIAGRAM Evergreen Unit Configuration Sheet 1 of 2 ...
Page 129: ...8 5 T 359 Figure 8 4 UNIT WIRING DIAGRAM Evergreen Unit Configuration Sheet 2 of 2 ...
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