INSTALLATION INSTRUCTIONS
R
−
410A Split System Air Conditioner
421 01 5104 02
11
Specifications subject to change without notice.
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
OPERATION
FAULT
AMBER LED
FLASH CODE
Possible Cause and Action
Standby – no call
for unit operation
None
On solid, no flash
Normal operation
−
with communicating Control
Standby – no call
for unit operation
None
Off
Normal operation
−
No call for cooling with 2
−
wire connection or indoor unit not pow-
ered.
Cooling Operation
None
1, pause
Normal operation
System Communications
Failure
16
Communication with wall control lost. Check wiring to wall control, indoor and outdoor
units
High Pressure
Switch Open
31
High pressure switch trip. Check refrigerant charge, outdoor fan operation and coils
for airflow restrictions.
Low Pressure
Switch Open
32
Low pressure switch trip. Check refrigerant charge and indoor air flow
Control Fault
45
Outdoor unit control board has failed. Control board needs to be replaced.
Brown Out
(24 v)
46
The control voltage is less than 15.5v for at least 4 seconds. Compressor and fan
operation not allowed until control voltage is a minimum of 17.5v. Verify control volt-
age.
Outdoor Air Temp Sensor
Fault
53
Outdoor air sensor not reading or out of range. Ohm out sensor and check wiring
Outdoor Coil Sensor Fault
55
Coil sensor not reading or out of range. Ohm out sensor and check wiring
Thermistors out
of range
56
Improper relationship between coil sensor and outdoor air sensor. Ohm out sensors
and check wiring.
Thermal Cutout
72
Compressor voltage sensed after start
−
up, then absent for 10 consecutive seconds
while cooling demand exists. Possible causes are internal compressor overload trip or
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.
Contactor Shorted
73
Compressor voltage sensed when no demand for compressor operation exists. Con-
tactor may be stuck closed or there is a wiring error.
No 230V at
Compressor
74
Compressor voltage not sensed when compressor should be starting. Disconnect may
be open or contactor may be stuck open or there is a wiring error.
Thermal Lockout
82
Thermal cutout occurs in three consecutive cycles. Unit operation locked out for 4
hours or until 24v power recycled.
Low Pressure Lockout
83
Low pressure switch trip has occurred during 3 consecutive cycles. Unit operation
locked out for 4 hours or until 24v power recycled.
High Pressure
Lockout
84
High pressure switch trip has occurred during 3 consecutive cycles. Unit operation
locked out for 4 hours or until 24v power recycled.
Figure 8
Resistance vs Temperature Chart
0
10
20
30
40
50
60
70
80
90
0
(-17.77)
20
(-6.67)
40
(4.44)
60
(15.56)
80
(26.67)
100
(37.78)
120
(48.89)
TEMPERATURE °F (°C)
RESISTANCE (KOHMS)
THERMISTOR CURVE
