Carrier 69NT40-541-300, Операция и обслуживание, Страница: 62 / 152

T-318 3 − 30
3.11 CONTROLLER ALARM INDICATIONS
Table 3-6 Controller Alarm Indications (Sheet 1 of 6)
Alarm Code Cause Components Troubleshooting Corrective Actions
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
Section 6.25.
If unable to obtain zero
reading, replace
defective VPS.
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 operating range.
AL11
Evaporator
fan 1 IP
Alarm 11 is triggered
when configured for
single evap operation
and MC6 sensed
high.
Evaporator Fan 1 The unit will suspend
probe check diagnostic lo-
gic and disable the probe
check portion of defrost
cycle.
AL11 is triggered off
when MC6 sensed low.
AL12
Evaporator
fan 2 IP
Alarm 12 is triggered
when configured for
single evap operation
and KB10 sensed
high.
Evaporator Fan 2 The unit will suspend
probe check diagnostic lo-
gic and disable the probe
check portion of defrost
cycle.
AL11 is triggered off
when KB10 sensed low.
AL15
Loss of
cooling
Unit fails to achieve
0.25 C temperature
delta for eight minutes
before a probe − check
defrost and then fails
again for thirty
minutes after the
probe − check.
N/A Power cycle the unit. Resetting the unit may
correct problem,
monitor the unit.
AL20
Control
Contactor
Fuse (F3)
Control power fuse
(F3A or F3B) is open.
Check F3A, if the
fuse is open:
Check PA, PB, CH coils for
short to ground, if short is
found:
Replace the defective
coil.
Replace the fuse.
Check F3B, if the
fuse is open:
Check ESV coil resistance
at TP7 to TP9, if short to
ground, or if resistance is
less than 4 ohms, coil is
defective.
Check CF, ES, EF, HR coils
for short to ground, if short
is found, coil is defective.
Replace the defective
coil.
Replace the fuse.
Check Voltage at
QC1:
If voltage is present, it
indicates a defective
microprocessor.
Refer to Controller
Service Section 6.23.