18
Table 7—TROUBLESHOOTING
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 − Model 25HNA9
only
Standard Thermo-
stat Control
(25HNA9 only)
Rapid, con-
tinuous flash-
ing
Unit being controlled by standard thermostat inputs instead of Infinity Con-
trol. 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 User Interface 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 operation detected then disappears while low stage
demand exists. Possible causes are internal compressor overload
trip or start relay and capacitor held in circuit too long (if installed).
High Stage Ther-
mal Cutout
72*
Compressor operation detected then disappears while high stage
demand exists. Possible causes are internal compressor overload
trip or start relay and capacitor held in circuit too long (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
(25HNA9 Only)
74
Compressor voltage not sensed when compressor should be start-
ing. Contactor may be stuck open or there is a wiring error.
Low Stage Did
Not Start
(25HNA6 Only)
75
Specified start voltage at VR terminal was not achieved in low stage.
Start relay was de−energized after 1 second.
Low Stage Did
Not Start 3 times
(25HNA6Only)
76
For 3 consecutive low stage starts, the specified start voltage at VR
terminal was not achieved & start relay was de−energized. Low
stage locked out for 30 minutes.
High Stage Did
Not Start
(25HNA6 Only)
77
Specified start voltage at VS terminal was not achieved in high
stage. Start relay was de−energized after 1 second.
High Stage Did
Not Start 3 times
(25HNA6 Only)
78
For 3 consecutive high stage starts, the specified start voltage at VS
terminal was not achieved & start relay was de−energized. High
stage locked out for 30 minutes.
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.
Low Contactor
Open
(25HNA6 Only)
85
Compressor voltage not sensed when compressor should be start-
ing. Low stage contactor may be stuck open or there is a wiring
error.
High Contactor
Open
(25HNA6 Only)
87
Compressor voltage not sensed when compressor should be start-
ing. High stage contactor may be stuck open or there is a wiring
error.
*Sequence: Compressor contactor is de−energized and outdoor fan is energized for up to 15 minutes. If demand still exists, control will
energize compressor contactor after 15 minute delay. If fault is cleared, unit will resume operation. If fault still exists, fan shuts off, and error
code continues to flash. Control will attempt re−start every 15 minutes. Cycling low voltage defeats the 15 minute delay.
25HNA
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