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Table 4 – Heat Pump/Air Conditioner Board Status Codes
OPERATION
FAUL T
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.
H i g h --- P r e s s u r e
Switch Open
31
High --- pressure switch trip. Check refrigerant charge, outdoor fan
operation and coils for airflow restrictions.
L o w --- P r e s s u r e
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 S e n sor
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.
L o w --- P r e s s u r e
Lockout
83
Low---pressure switch trip has occurred during 3 consecutive
cycles. Unit operation locked out for 4 hours or until 24v power
recycled.
H i g h --- P r e s s u r e
Lockout
84
High---pressure switch trip has occurred during 3 consecutive
cycles. Unit operation locked out for 4 hours or until 24v power
recycled.
COMPRESSOR OPERATION
When the compressor is operating in low stage, the modulating
ring is deactivated, allowing two internal bypass ports to close off
33% of the scroll compression area so the system operates at part
load capacity. The 24 --volt solenoid coil is de-- energized in
low-- stage operation.
When the compressor is operating at high stage, the modulating
ring is activated, sealing the bypass ports, which allows the
compressor to operate at full load capacity. The 24 --volt solenoid
coil is energized in high stage operation.
CRANKCASE HEATER OPERATION (IF APPLICABLE)
The crankcase heater is energized during off cycle below 65_F
(18_C) outdoor air temperature.
OUTDOOR FAN MOTOR OPERATION
The outdoor unit control energizes the outdoor fan any time the
compressor is operating, except for defrost. The outdoor fan
remains energized if a pressure switch or compressor overload
should open. Outdoor fan motor will continue to operate for one
minute after the compressor shuts off when the outdoor ambient is
greater than or equal to 100_F(38°C).
TIME DELAYS --HEAT PUMP OPERATIONS
The unit time delays include:
48XT-- A
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