Lennox International Inc 15CHAX Series System Operation Monitor LED Troubleshooting Codes, Off

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Table 5

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.

 

 

 

Green

Module not powering up

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

and voltage is present at both terminals.

OFF

 

 

1.

 

Red

System and compressor

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

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 pres-

2.

Condenser coil poor air circulation (dirty, blocked, dam-

 

sure out of limits or

 

aged).

 

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

Welded Contactor −

1.

Compressor contactor failed to open.

Code 8*

Compressor always runs

2.

Thermostat demand signal not connected to module.

 

 

 

 

Yellow

Low Voltage − Control

1.

Control circuit transformer is overloaded.

Code 9*

circuit <17VAC

2.

Low line voltage (contact utility).

 

 

 

 

*Flash code number corresponds to a number of LED flashes, followed by a pause, and then repeated. Reset ALERT flash code by removing 24VAC power from monitor; last code will display for 1 minute after monitor is powered on.

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Contents Table of Contents Shipping & Packing List15CHAX Unit Dimensions − inches mm TOP ViewParts Arrangement General RequirementsRigging & Setting Unit Accessory Lift KitService Clearances Location SelectionExisting Common Vent Systems Condensate DrainTypical Condensate Drain Filters Supply & Return Duct ConnectionsCompressors ElectricalOptional Electric Heat ThermostatPackaged Electric Units Wiring Diagram 15CHAX Series Typical Adjust Blower Control Board A54Cool JustSystem Operation Monitor Lsom System Operation Monitor A132System Operation Monitor LED Troubleshooting Codes OFFUnit Start−Up and Operation Maintenance Condenser Fan ClearancesFilters Motors

15CHAX Series specifications

Lennox International Inc. is a leading provider of climate control products and systems, and their 15CHAX Series represents a significant advancement in residential heating and cooling technology. This series is designed with efficiency, comfort, and advanced features to cater to modern HVAC needs.

One of the standout features of the 15CHAX Series is its impressive Seasonal Energy Efficiency Ratio (SEER) rating. With ratings up to 15 SEER, the 15CHAX units offer substantial energy savings compared to older models. This level of efficiency not only reduces electricity costs but also minimizes the environmental impact, making it a preferred choice for eco-conscious consumers.

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Overall, the Lennox 15CHAX Series exemplifies innovation in HVAC technology with its energy efficiency, quiet operation, advanced control features, and reliable performance. This makes it an excellent choice for homeowners looking to enhance their comfort while being mindful of energy consumption and environmental impact.
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