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Status Codes

Table 17 shows the status codes flashed by the amber status light.

Most system problems can be diagnosed by reading the status code

as flashed by the amber status light on the control board.

The codes are flashed by a series of short and long flashes of the

status light. The short flashes indicate the first digit in the status

code, followed by long flashes indicating the second digit of the

error code.

The short flash is 0.25 seconds ON and the long flash is 1.0 second

ON. Time between flashes is 0.25 seconds. Time between short

flash and first long flash is 1.0 second. Time between code

repeating is 2.5 seconds with LED OFF.

EXAMPLE:

3 short flashes followed by 2 long flashes indicates a 32 code.

Table 17 shows this to be low pressure switch open.

Table 17—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

E m e r ge n c y M o d e --- M o d e l

25HNA9/24ANA1 with serial num-

ber 3709 and prior.

Standard Thermostat

Control

(25HNA9/24ANA1

only)

Rapid,

continuous

flashing

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, pau se Normal operation

High Stage Cool/Heat Operation None 2, pau se Normal operation

System Communica-

tions Failure

Communication with User Interface lost. Check wiring to UI, indoor and

outdoor u nits

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 (230v) 46

Line voltage < 187v for at least 4 seconds. Compressor and fan operation

not allowed until voltage>

190v. Verify line vol tage.

No 230v at Unit

Measured at L1 and

L2 on circuit board

There is no 230v at the contactor when indoor un it 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

Outdoor air sensor n ot reading or out of r ange. 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

Improper r el ationship between coil sensor and outdoor air sensor. Ohm out

sensors and check wiring.

Low Stage

Thermal 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

Thermal 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 operation

exists. Contactor may be stuck closed or there is a wiring error.

No 230V at

Compressor

(25HNA9 Only)

Compressor voltage not sensed when compressor should be starting. Con-

tactor may be stuck open or there is a wiring error.

Low Stage Did Not

Start

(25HNA6 Only)

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)

For 3 consecutive low stage starts, the specified start voltage at VR terminal

was not achieved & start relay was de---energized. L ow stage locked out f or

30 minutes.

High Stage Did Not

Start

(25HNA6 Only)

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)

For 3 consecutive high stage starts, the specified start voltage at VS terminal

was not achieved & start relay was de---energized. High stage l ocked out for

30 minutes.

Low Stage

Thermal Lockout

Thermal cutout occurs in three consecutive low/high stage cycles. Low

stage locked out for 4 hours or until 24v power recycled.

High Stage

Thermal Lockout

Thermal cutout occurs in three consecutive high/low stage cycles. High

stage locked out for 4 hours or until 24v power recycled.

Low---Pressure Lock-

out

Low pressure switch trip has occurred during 3 consecutive cycles. Unit

operation locked out for 4 hours or until 24v power recycled.

H ig h --- P r e s s u r e

Lockout

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)

Compressor voltage not sensed when compressor should be starting. Low

stage contactor may be stuck open or ther e is a wiring error.

High Contactor Open

(25HNA6 Only)

Compressor voltage not sensed when compressor should be starting. High

stage contactor may be stuck open or ther e is a wiring error.

*Sequence: C ompressor contactor is de---ener gized 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.

Status Codes 1

Summary of Contents

Page 1 - Status Codes

54Status CodesTable 17 shows the status codes flashed by the amber status light.Most system problems can be diagnosed by reading the status codeas fla

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Carrier INFINITY 24ANA User Manual

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