Table 14 — 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”

Thermostat demand signal Y

1.

Compressor protector is open

LED On Solid

is present, but the

2.

Condensing unit power disconnect is open

 

compressor is not running.

 

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

The anti-short cycle timer (3

minutes), in module is preventing compressor

Flashing

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”

A short circuit or over current

1.

Compressor contactor coil shorted

LED On Solid

condition exists on PROT

2.

Electrical load too high for PROT circuit

 

terminal.

 

 

(maximum 1 Amp)

 

 

 

 

 

3.

24 V AC wired directly to PROT terminal

Yellow “ALERT”

System Pressure Trip

1.

High head pressure

Flash Code 2

Discharge pressure out of

2.

Condenser coil poor air circulation (dirty,

 

limits or compressor

 

 

blocked, damaged)

 

overload (if no high pressure

 

 

3.

Condenser fan is not running

 

switch in system)

 

LOCKOUT

4.

If low pressure switch is open:

 

 

 

Refer to Code 3 for troubleshooting

Yellow “ALERT”

Short Cycling

1.

If low pressure switch is open:

Flash Code 3

Compressor is running only

 

a.

Low refrigerant charge

 

briefly LOCKOUT

 

 

 

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”

Locked Rotor

1.

Low line voltage to compressor

Flash Code 4

LOCKOUT

2.

Excessive liquid refrigerant in compressor

 

 

 

 

3.

Compressor bearings are seized

Yellow “ALERT”

Open Circuit

1.

Condensing unit power disconnect is open

Flash Code 5

 

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”

Missing Phase

1.

Compressor fuse is open on one phase

Flash Code 6

LOCKOUT

2.

Broken wire or connector on one phase

 

 

 

 

3.

Compressor motor winding is damaged

 

 

4.

Utility supply has dropped one phase

Yellow “ALERT”

Reverse Phase

1.

Compressor running backward due to supply

Flash Code 7

LOCKOUT

 

phase reversal

Yellow “ALERT”

Welded Contactor

1.

Compressor contactor has failed closed

Flash Code 8

Compressor always runs

2.

Thermostat demand signal not connected to

 

 

 

module

Yellow “ALERT”

Low Voltage

1.

Control circuit transformer is overloaded

Flash Code 9

Control circuit < 18VAC

2.

Low line voltage to compressor

 

 

29

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Carrier 38AUQ appendix LED Status Codes, Lockout

38AUQ specifications

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