Carrier 68G5-105 Series Operation & Service Manual page 30

Table 3-3. Driver Display Panel Alarm Message Definition - Continued
ALARM
TITLE
NO.
A14 Ambient
Probe Failure
A15 Suction Press-
ure
Transducer
Failure
A16 Discharge
Pressure
Transducer
Failure
A17 Humidity
Transducer
Failure
A18 Fuse Blown
Alarm
A19 Main
Evaporator
Fan Overload
A22 Condenser
Fan Overload
T-312
CAUSE
Sensor is unplugged,
wiring defective or
ambient temperature
sensor failure.
Sensor is unplugged,
wiring defective or
suction pressure trans-
ducer failure.
Sensor is unplugged,
wiring defective or
discharge pressure
transducer failure.
Sensor is unplugged,
wiring defective or
humidity transducer
failure.
Defective wiring or
coach power source de-
fective. microprocessor
Internal fuse is blown.
Main evaporator fan
overload.
Condenser fan over-
loads
REMEDY
Ensure sensor is
plugged in. Check
sensor resistance or
wiring. Replace sen-
sor or repair wiring.
(Refer to section 4.13
and Table 4-3.)
Ensure sensor is
plugged in. Check
transducer voltage or
wiring. Replace sen-
sor or repair wiring.
(Refer to section 4.15
and Table 4-5.)
Ensure sensor is
plugged in. Check
transducer voltage or
wiring. Replace sen-
sor or repair wiring.
(Refer to section 4.15
and Table 4-5.)
Ensure sensor is
plugged in. Check
transducer voltage or
wiring. Replace sen-
sor or repair wiring.
(Refer to section 4.14
and Table 4-4.)
Repair or replace
wiring or power
source. Replace Fuse.
Refer to section 3.3.6. No microprocessor response other
Refer to section 3.3.3
and/or 3.3.4
3-2
MICROPROCESSOR RESPONSE
Ignores ambient temperature and
does not lock out the compressor
and does not open driver RAM air in
AUTO mode.
Energizes unloaders.
Energizes unloaders.
If conditions allow, not including the
humidity set point/humidity sensor
condition, activates humidity control
(dehumidification). (See section
2.3.4.) Does not open passenger
RAM air in AUTO. (Refer to section
2.3.11.)
All microprocessor outputs are de-
energized.
than alarm.
If the compressor is energized and
the first condenser fan overload
opens, the microprocessor will ener-
gize the second condenser fan in or-
der to detect the first overload con-
dition.
If, after energizing the second con-
denser fan, the second condenser fan
overload opens, the compressor
clutch will de-energize for the mini-
mum off time, since neither con-
denser fan is operating.