Status Codes - International comfort products CSH5 Installation Instructions Manual

INSTALLATION INSTRUCTIONS
measure resistance across each thermistor. For example, if
the outdoor temperature is 60_F (15.56_C), the resistance
reading across the outdoor air thermistor should be around
16,000 Ohms.

STATUS CODES

Table 3 shows the status codes flashed by the amber status
light. Most system problems can be diagnosed by reading
the status code as flashed by the amber status light on the
control board.
The codes are flashed by a series of short and long flashes
of the status light. The short flashes indicate the first digit in
the status code, followed by long flashes indicating the
OPERATION FAULT
Standby – no call
None
for unit operation
Cooling Operation None
System Communications
Failure
High Pressure
Switch Open
Low Pressure
Switch Open
Control Fault
Brown Out
(24 v)
Outdoor Air Temp Sensor
Fault
Outdoor Coil Sensor Fault
Thermistors out
of range
Thermal Cutout
Contactor Shorted
No 230V at
Compressor
Thermal Lockout
Low Pressure Lockout
High Pressure
Lockout
428 01 5105 01
second digit of the error code. The short flash is 0.25 second
ON and the long flash is 1.0 second ON. Time between
flashes is 0.25 second. Time between short flash and first
long flash is 1.0 second. Time between code repeating is 2.5
seconds with LED OFF.
Count the number of short and long flashes to determine the
appropriate flash code. Table 3 gives possible causes and
actions related to each error.
Example: 3 short flashes followed by 2 long flashes indicates
a 32 code. Table 3 shows this to be low pressure switch
open.
Table 3 − Status Codes
AMBER LED
FLASH CODE
On solid, no flash Normal operation − with communicating Control
1, pause Normal operation
Communication with wall control lost. Check wiring to wall control, indoor and outdoor
16
units
High pressure switch trip. Check refrigerant charge, outdoor fan operation and coils
31
for airflow restrictions.
32 Low pressure switch trip. Check refrigerant charge and indoor air flow
Outdoor unit control board has failed. Control board needs to be replaced.
45
The control voltage is less than 15.5v for at least 4 seconds. Compressor and fan
46 operation not allowed until control voltage is a minimum of 17.5v. Verify control volt-
age.
53 Outdoor air sensor not reading or out of range. Ohm out sensor and check wiring
55 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
56
and check wiring.
Compressor voltage sensed after start−up, then absent for 10 consecutive seconds
while cooling demand exists. Possible causes are internal compressor overload trip or
72 loss of high voltage to compressor without loss of control voltage. The control will
continue fan operation and wait 15 minutes to attempt a restart. Fault will clear when
restart is successful, or low voltage power is cycled.
Compressor voltage sensed when no demand for compressor operation exists. Con-
73
tactor may be stuck closed or there is a wiring error.
Compressor voltage not sensed when compressor should be starting. Disconnect may
74
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
82
hours or until 24v power recycled.
Low pressure switch trip has occurred during 3 consecutive cycles. Unit operation
83
locked out for 4 hours or until 24v power recycled.
High pressure switch trip has occurred during 3 consecutive cycles. Unit operation
84
locked out for 4 hours or until 24v power recycled.
R−410A Split System Heat Pumps
Possible Cause and Action
13