Table 10

System Operation Monitor LED Troubleshooting Codes

Status LED Condition

Status LED Description

Status LED Troubleshooting Information

 

 

 

 

 

 

Green

Module has power

24VAC control power is present at the module terminal.

 

 

 

 

 

Determine/verify that both Y and C module terminals are connected

Green LED OFF

Module not powering up

and voltage is present at both terminals with a thermostat demand for

 

 

cooling (Y).

 

 

 

 

Red rip" LED ON

System and compressor

1.

Verify Y terminal is connected to 24VAC at contactor coil.

 

check out OK

2.

Verify voltage at contactor coil falls below 0.5VAC when off.

 

 

3.

Verify 24VAC is present across Y and C when thermostat

 

 

 

demand signal is present; if not present, R and C wires are

 

 

 

reversed.

 

Thermostat demand signal

1.

Compressor protector is open.

 

Y1 is present, but compres-

2.

Outdoor unit power disconnect is open.

 

sor not running

3.

Compressor circuit breaker or fuse(s) is open.

 

 

4.

Broken wire or connector is not making contact.

 

 

5.

Low pressure switch open if present in the system.

 

 

6.

Compressor contactor has failed to close.

 

 

 

 

Red rip" & Yellow

Simultaneous flashing

Indicates that the control circuit voltage is too low for operation.

 

 

 

 

 

Yellow

Long Run Time −

1.

Low refrigerant charge.

Code 1*

Compressor is running

2.

Evaporator blower is not running.

 

extremely long run cycles

3.

Evaporator coil is frozen.

 

 

4.

Faulty metering device.

 

 

5.

Condenser coil is dirty.

 

 

6.

Liquid line restriction (filter drier blocked if present).

 

 

7.

Thermostat is malfunctioning.

Yellow

System Pressure Trip −

1.

High head pressure.

Code 2*

Discharge or suction

2.

Condenser coil poor air circulation (dirty, blocked,

 

pressure out of limits or

 

damaged).

 

compressor overloaded

3.

Condenser fan is not running.

 

 

4.

Return air duct has substantial leakage.

 

 

5.

If low pressure switch is present, see Flash Code 1 info.

 

 

 

 

Yellow

Short Cycling − Compres-

1.

Thermostat demand signal is intermittent.

Code 3*

sor is running only briefly

2.

Time delay relay or control board is defective.

 

 

3.

If high pressure switch is present, see Flash Code 2 info.

 

 

4.

If low pressure switch is present, see Flash Code 1 info.

 

 

 

 

Yellow

Locked Rotor

1.

Run capacitor has failed.

Code 4*

 

2.

Low line voltage (contact utility).

 

 

3.

Excessive liquid refrigerant in the compressor.

 

 

4.

Compressor bearings are seized.

 

 

 

 

Yellow

Open Circuit

1.

Outdoor unit power disconnect is open.

Code 5*

 

2.

Unit circuit breaker or fuse(s) is open.

 

 

3.

Unit contactor has failed to close.

 

 

4.

High pressure switch is open and requires manual reset.

 

 

5.

Open circuit in compressor supply wiring or connections.

 

 

6.

Unusually long compressor protector reset time due to

 

 

 

extreme ambient temperature.

 

 

7.

Compressor windings are damaged.

 

 

 

 

Yellow

Open Start Circuit −

1.

Run capacitor has failed.

Code 6*

Current only in run circuit

2.

Open circuit in compressor start wiring or connections.

 

 

3.

Compressor start winding is damaged.

 

 

 

 

Yellow

Open Run Circuit − Current

1.

Open circuit in compressor start wiring or connections.

Code 7*

only in start circuit

2.

Compressor start winding is damaged.

 

 

 

 

Yellow

Low Voltage − Control

1.

Control circuit transformer is overloaded.

Code 9*

circuit <17VAC

2.

Low line voltage (contact utility).

 

 

 

 

table continued on next page

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Image 22
Lennox International Inc 15GCSX, Gas Packaged Units System Operation Monitor LED Troubleshooting Codes
Page 21 Page 23

Gas Packaged Units, 15GCSX specifications

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