18
Table 2 – 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 b y 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 p lug.
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 wiri ng 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. O hm out sensor and check
wiring.
Thermistors O ut
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.
COOLING AND HEATING OPERATION
With a call for first stage cooling, the outdoor fan, reversing valve,
and low stage compressor are energized. If low--stage cannot
satisfy cooling demand, high--stage cooling is energized by the UI.
After second stage is satisfied, the unit returns to low--stage
operation until first stage is satisfied or until second stage is
required again. When both first stage and second stage cooling are
satisfied, the compressor will shut off. The reversing valve will
remain energized until the control board power is removed or a call
for heating in initiated. With a call for heating, the outdoor fan and
compressor are energized. The compressor will operate in high or
low stage operation, as needed to meet the heating demand. When
the heating demand is satisfied, the compressor and fan will shut
off. The reversing valve is de--energized in the heating mode.
NOTE: When two--stage unit is operating at low-- stage, system
vapor (suction) pressure will be higher than a standard single--stage
system or high--stage operation.
NOTE: Outdoor fan motor will continue to operate for one
minute after compressor shuts off, when outdoor ambient is greater
than or equal to 100°F(38°C).
UTILITY INTERFACE WITH INFINITY CONTROL
The utility curtailment relay should be connected to factory
supplied pigtails (PINK, connected to R, VIOLET connected to Y2
on the control board) located in the low voltage splice box (See
50XT--A
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