Operation; Flash Code - Carrier Infinity 25HNB5 Installation Instructions Manual

OPERATION

Standby – no call for
unit operation
Cool/Heat Operation
System Communica-
tions Failure
High Pressure Switch
Low Pressure Switch
Control Fault
Brown Out
Outdoor Air Temp
Sensor Fault
Outdoor Coil Sensor
Thermistors out of
Thermal Cutout
Contactor Shorted
No 230V at Compres-
Thermal Lockout
Low Pressure Lock-
High Pressure Lock-
Table 4—Status Codes
AMBER LED
FAULT

FLASH CODE

On solid, no
None
flash
None 1, pause
16
31
Open
32
Open
45
46
(24 v)
53
55
Fault
56
range
72
73
74
sor
82
83
out
84
out
POSSIBLE CAUSE AND ACTION
Normal operation
Normal operation
Communication with user interface lost. Check wiring to UI, indoor
and outdoor units
High pressure switch trip. Check refrigerant charge, outdoor fan
operation and coils for airflow restrictions.
Low pressure switch trip. Check refrigerant charge and indoor air
flow
Outdoor unit control board has failed. Control board needs to be
replaced.
The control voltage is less than 15.5v for at least 4 seconds. Com-
pressor and fan operation not allowed until control voltage is a mini-
mum of 17.5v. Verify control voltage.
Outdoor air sensor not reading or out of range. Ohm out sensor
and check wiring
Coil sensor not reading or out of range. Ohm out sensor and check
wiring
Improper relationship between coil sensor and outdoor air sensor.
Ohm out sensors and check wiring.
Compressor voltage sensed after start–up, then absent for 10 con-
secutive seconds while cooling demand exists. Possible causes are
internal compressor overload trip or loss of high voltage to com-
pressor without loss of control voltage.
Compressor voltage sensed when no demand for compressor op-
eration exists. Contactor may be stuck closed or there is a wiring
error.
Compressor voltage not sensed when compressor should be start-
ing. Disconnect may be open or contactor may be stuck open or
there is a wiring error.
Thermal cutout occurs in three consecutive cycles. Unit operation
locked out for 4 hours or until 24v power recycled.
Low pressure switch trip has occurred during 5 consecutive cycles.
Unit operation locked out for 4 hours or until 24v power recycled.
High pressure switch trip has occurred during 5 consecutive cycles.
Unit operation locked out for 4 hours or until 24v power recycled.
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