3-2
T--295
Table 3 -2 Alarm Codes
ALARM
NO.
TITLE CAUSE REMEDY CONTROLLER
RESPONSE
A11 Coil Freeze Coil temperature is
less than 32F and the
compressor is operat-
ing.
Check causes of coil
freezing. (Refer to
section 3.3.6)
An alarm will be gener-
ated and the system will
shutdown. The evapora-
tor fans will remain run-
ning while the compres-
sor is off.
A12 High Voltage The battery voltage is
greater than 32 volts.
Check, repair or re-
place alternator.
The system is shut down
until the voltage returns
to normal levels.
A13 Low Voltage The battery voltage is
less than 17 volts.
Check, repair or re-
place wiring or alter-
nator.
The system is shut down
until the voltage returns
to normal levels.
A14 Return Air Probe Failure Return air temperature
sensor failure or wir-
ing defective.
Ensure all connectors
are plugged in. Check
sensor resistance or
wiring. Refer to para-
graph 4.21. Replace
sensor or repair wir-
ing.
All outputs except the
evaporator fans will be
de-energized.
A15 Suction Pressure
Transducer Failure
Suction pressure
transducer failure or
wiring defective.
Ensure all connectors
are plugged in. Check
sensor voltage or wir-
ing. Replace sensor or
repair wiring.
Both unloaders are ener-
gized.
A16 Discharge Pressure
Transducer Failure
Discharge pressure
transducer failure or
wiring defective.
Ensure all connectors
are plugged in. Check
sensor voltage or wir-
ing. Replace sensor or
repair wiring.
One unloader is ener-
gized.
A17 Low Pressure Shutdown Low suction pressure
switch open or wiring
defective.
Check cause of low
suction pressure. (Re-
fertosection3.5.3)
The clutch is de-ener-
gized for the minimum
off time. The evaporator
fans will remain running
during this period. After
the compressor cycles
off three times in 30
minutes all outputs will
be de-energized and the
system is locked out un-
til the power is cycled or
the alarm is reset.
A21 High Discharge Pressure High discharge pres-
sure switch open or
wiring defective.
Check discharge pres-
sure transducer read-
ing, wiring or cause of
high discharge pres-
sure. (Refer to section
3.3.3)
The clutch is de-ener-
gized for the minimum
off time. The condenser
and evaporator fans will
remain running during
this period. After the
compressor cycles off
three times in 30 min-
utes all outputs will be
de-energized and the
system is locked out un-
til the power is cycled or
the alarm is reset.
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