20
Table 5—
HEAT PUMP/AIR CONDITIONER BOARD STATUS CODES
OPERATION
FAULT
AMBER
LED
FLASH
CODE
POSSIBLE CAUSE AND ACTION
Standby – no call for unit opera-
tion
None
On solid,
no flash
Normal operation.
Emergency Mode
Standard Ther-
mostat Control
Rapid, con-
tinuous
flashing
Unit being controlled by standard thermostat inputs instead of Infin-
ity Control. Only high stage operation is available. This operating
mode should be used in emergency situations only.
Low Stage Cool/Heat Operation
None
1, pause
Normal operation.
High Stage Cool/Heat Opera-
tion
None
2, pause
Normal operation.
System Commu-
nications Failure
16
Communication with UI lost. Check wiring to UI, indoor and outdoor
units.
Invalid Model
Plug
25
Control does not detect a model plug or detects an invalid model
plug. Unit will not operate without correct model plug.
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
(230 v)
46
Line voltage < 187v for at least 4 seconds. Compressor and fan
operation not allowed until voltage>190v. Verify line voltage.
No 230v at Unit
47
There is no 230v at the contactor when indoor unit is powered and
cooling/heating demand exists. Verify the disconnect is closed and
230v wiring is connected to the unit.
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.
Low Stage Ther-
mal Cutout
71
Compressor voltage sensed, then disappears while cooling or heat-
ing demand exists. Possible causes are internal compressor over-
load trip or start relay not releasing (if installed).
High Stage Ther-
mal Cutout
72
Compressor voltage sensed, then disappears while cooling or heat-
ing demand exists. Possible causes are internal compressor over-
load trip or start relay not releasing (if installed).
Contactor
Shorted
73
Compressor voltage sensed when no demand for compressor op-
eration exists. Contactor may be stuck closed or there is a wiring
error.
No 230V at
Compressor
74
Compressor voltage not sensed when compressor should be start-
ing. Contactor may be stuck open or there is a wiring error.
Low Stage Ther-
mal Lockout
81
Thermal cutout occurs in three consecutive low/ high stage cycles.
Low stage locked out for 4 hours or until 24v power recycled.
High Stage Ther-
mal Lockout
82
Thermal cutout occurs in three consecutive high/low stage cycles.
High stage 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.
S
Five minute compressor recycle delay on return from a
brown--out condition.
S
Two minute time delay to return to standby operation
from last valid communication (with Infinity only).
S
One minute time delay of outdoor fan at termination of
cooling mode when outdoor ambient is greater than or
equal to 100
_
F.
S
There is no time delay between air conditioner staging
from low to high and from high to low capacity; the
compressor will change from low to high and from high
to low capacity as demand dictates.
INFINITY CONTROLLED LOW AMBIENT COOLING
NOTE
:When this unit is operating below 55
_
F outdoor
temperature, provisions must be made for low ambient operation.
This unit is capable of low ambient cooling ONLY when using the
Infinity control. A low ambient kit is not required, and the outdoor
fan motor does not need to be replaced for Infinity controlled low
ambient operation.
Low ambient cooling must be enabled in the
UI set--up.
Fan may not begin to cycle until about 40
_
F OAT. Fan
will cycle based on coil and outdoor air temperature. Infinity
controlled low ambient mode operates as follows:
48D
U
48D
U