Carrier 38AUZ User Manual download pdf (Page 20)

Table 6 — LED Status Codes

Status LED Status LED Description Status LED Troubleshooting Information

Green “POWER” Module has power Supply voltage is present at module terminals

Red “TRIP”

LED On Solid

Thermostat demand signal Y

is present, but the

compressor is not running.

1. Compressor protector is open

2. Condensing unit power disconnect is open

3. Compressor circuit breaker or fuse(s) is open

4. Broken supply wires or connector is not

making contact

5. Compressor power wires not routed through

Comfort Alert

6. Compressor contactor has failed open

Red “TRIP” LED

Flashing

The anti-short cycle timer (3 minutes), in module is preventing compressor

restart.

Module locks out compressor when compressor damaging ALERT code appears.

Lockout ALERT codes are noted in the Status LED Description.

During a compressor lock out, 24VAC power must be removed from module to manually reset.

Yellow “ALERT”

LED On Solid

A short circuit or over current

condition exists on PROT

terminal.

1. Compressor contactor coil shorted

2. Electrical load too high for PROT circuit

(maximum 1 Amp)

3. 24 V AC wired directly to PROT terminal

Yellow “ALERT”

Flash Code 2

System Pressure Trip

Discharge pressure out of

limits or compressor

overload (if no high pressure

switch in system)

LOCKOUT

1. High head pressure

2. Condenser coil poor air circulation (dirty,

blocked, damaged)

3. Condenser fan is not running

4. If low pressure switch is open:

Refer to Code 3 for troubleshooting

Yellow “ALERT”

Flash Code 3

Short Cycling

Compressor is running only

briefly LOCKOUT

1. If low pressure switch is open:

a. Low refrigerant charge

b. Evaporator blower is not running

c. Evaporator coil is frozen

d. Faulty metering device

e. Condenser coil is dirty

f. Liquid line restriction (filter drier blocked if

present)

2. If high pressure switch is open, go to Flash

Code 2 information

3. Intermittent thermostat demand signal

4. System or control board defective

Yellow “ALERT”

Flash Code 4

Locked Rotor

LOCKOUT

1. Low line voltage to compressor

2. Excessive liquid refrigerant in compressor

3. Compressor bearings are seized

Yellow “ALERT”

Flash Code 5

Open Circuit 1. Condensing unit power disconnect is open

2. Compressor circuit breaker or fuses are open

3. Compressor contactor has failed open

4. High pressure switch is open and requires

manual reset

5. Broken supply wires or connector is not

making contact

6. Unusually long compressor protector reset

time due to extreme ambient temperature

7. Compressor windings are damaged

Yellow “ALERT”

Flash Code 6

Missing Phase

LOCKOUT

1. Compressor fuse is open on one phase

2. Broken wire or connector on one phase

3. Compressor motor winding is damaged

4. Utility supply has dropped one phase

Yellow “ALERT”

Flash Code 7

Reverse Phase

LOCKOUT

1. Compressor running backward due to supply

phase reversal

Yellow “ALERT”

Flash Code 8

Welded Contactor

Compressor always runs

1. Compressor contactor has failed closed

2. Thermostat demand signal not connected to

module

Yellow “ALERT”

Flash Code 9

Low Voltage

Control circuit < 18VAC

1. Control circuit transformer is overloaded

2. Low line voltage to compressor

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Carrier 38AUZ User Manual Page 20

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