Installation guide

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 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
OPERATION FAULT POSSIBLE CAUSE AND ACTION
FLASH CODE
Standby no call for None On solid, no Normal operation
unit operation flash
Cool/Heat Operation None 1, pause Normal operation
System Communica- 16 Communication with user interface lost. Check wiring to UI, indoor
tions Failure and outdoor units
High Pressure Switch 31 High pressure switch trip. Check refrigerant charge, outdoor fan
Open operation and coils for airflow restrictions.
Low Pressure Switch 32 Low pressure switch trip. Check refrigerant charge and indoor air
Open flow
Outdoor unit control board has failed. Control board needs to be
Control Fault 45
replaced.
Brown Out The control voltage is less than 15.5v for at least 4 seconds. Com-
46 pressor and fan operation not allowed until control voltage is a mini-
(24 v) mum of 17.5v. Verify control voltage.
Outdoor Air Temp 53 Outdoor air sensor not reading or out of range. Ohm out sensor
Sensor Fault and check wiring
Outdoor Coil Sensor 55 CoiI sensor not reading or out of range. Ohm out sensor and check
Fault wiring
Thermistors out of 56 Improper relationship between coiI sensor and outdoor air sensor.
range Ohm out sensors and check wiring.
Compressor voltage sensed after start-up, then absent for 10 con-
Thermal Cutout 72 secutive seconds while cooling demand exists. Possible causes are
internal compressor overload trip or loss of high voltage to com-
pressor without Ioss of control voltage.
Compressor voltage sensed when no demand for compressor op-
Contactor Shorted 73 eration exists. Contactor may be stuck closed or there is a wiring
error.
Compressor voltage not sensed when compressor should be start-
No 230V at Compres- 74 ing. Disconnect may be open or contactor may be stuck open or
sor there is a wiring error.
Thermal cutout occurs in three consecutive cycles. Unit operation
Thermal Lockout 82
locked out for 4 hours or until 24v power recycled.
Low Pressure Lock- 83 Low pressure switch trip has occurred during 5 consecutive cycles.
out Unit operation locked out for 4 hours or until 24v power recycled.
High Pressure Lock- 84 High pressure switch trip has occurred during 5 consecutive cycles.
out Unit operation locked out for 4 hours or until 24v power recycled.
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