Carrier Infinity 24ANB7 Installation Instructions Manual page 12

OPERATION
Standby – no call for unit operation
Low Stage Cool/Heat Operation
High Stage Cool/Heat Operation
Brown out protection is Disabled
Brown out protection is Active
* 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.
Table 6 – Troubleshooting
AMBER LED
FAULT FLASH
CODE
On solid, no
None
flash
None 1, pause
None 2, pause
None 5, pause
None 6, Pause
System Commu- 16
nications Failure
Invalid Model Plug 25
High Pressure
31*
Switch Open
Low Pressure
Switch or Dis-
32*
charge Temp
Switch Open
Control Fault 45
Brown Out (230 v) 46
No 230v at Unit 47
Outdoor Air Temp
53
Sensor Fault
Outdoor Coil
55
Sensor Fault
Thermistors out of
56
range
Low Stage
71*
Thermal Cutout
High Stage
72*
Thermal Cutout
Contactor Shorted 73
No 230V at
74
Compressor
Low Stage
81
Thermal Lockout
High Stage
82
Thermal Lockout
Low---Pressure
83
Lockout
High ---Pressure
84
Lockout
POSSIBLE CAUSE AND ACTION
Normal operation
Normal operation
Normal operation
User made selection, see instructions for more detail
User made selection, see instructions for more detail
Communication with User Interface lost. Check wiring to User Interface,
indoor and outdoor units
Control does not detect a model plug or detects an invalid model plug. Unit
will not operate without correct model plug.
High ---pressure switch trip. Check refrigerant charge, outdoor fan operation
and coils for airflow restrictions.
Low---pressure switch or discharge temperature switch trip. Check refrigerant
charge and indoor air flow.
Outdoor unit control board has failed. Control board needs to be replaced.
Line voltage < 187v for at least 4 seconds. Compressor and fan operation
not allowed until voltage>190v. Verify line voltage.
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 sensor not reading or out of range. Ohm out sensor and check
wiring.
Coil sensor not reading or out of range. Ohm out sensor and check wiring.
Improper relationship between coil sensor and outdoor air sensor. Ohm out
sensors and check wiring.
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).
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).
Compressor voltage sensed when no demand for compressor operation
exists. Contactor may be stuck closed or there is a wiring error.
Compressor voltage not sensed when compressor should be starting. Con-
tactor may be stuck open or there is a wiring error.
Thermal cutout occurs in three consecutive low/high stage cycles. Low
stage locked out for 4 hours or until 24v power recycled.
Thermal cutout occurs in three consecutive high/low stage cycles. High
stage locked out for 4 hours or until 24v power recycled.
Low pressure switch trip has occurred during 3 consecutive cycles. Unit
operation locked out for 4 hours or until 24v power recycled.
High pressure switch trip has occurred during 3 consecutive cycles. Unit
operation locked out for 4 hours or until 24v power recycled.
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