Emerson AE8-1385 specifications CoreSense Diagnostics LED Troubleshooting Information

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Application Engineering

 

 

 

 

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AE8-1385

Table 2 – CoreSense Diagnostics LED Troubleshooting Information

Flash Code number corresponds to the number of LED flashes, followed by a pause and then repeated.

TRIP and ALERT LEDs flashing at same time means control circuit voltage is too low for operation (brown-out conditions).

Status

Description

 

 

Troubleshooting Information

Solid Green “RUN”

Module has power and

Supply voltage is present at module terminals

operating normally

 

 

 

 

 

 

1.

Compressor protector is open

 

 

 

•

Check for high head pressure

 

Thermostat demand signal Y is

 

•

Check compressor supply voltage

 

2.

Outdoor unit power disconnect is open

Solid Red “TRIP”

present, but the compressor is

3.

Compressor circuit breaker or fuse(s) is open

 

not running

 

4.

Broken wire or connector is not making contact

 

 

 

 

5.

High pressure switch open if present in system

 

 

6.

Compressor contactor has failed open

“ALERT” Flash Codes

1.Low refrigerant charge

2.Evaporator blower is not running

•Check blower relay coil and contacts

•Check blower motor capacitor

•Check blower motor for failure or blockage

•Check evaporator blower wiring and connectors

•Check indoor blower control board

•Check thermostat wiring for open circuit

 

Long Run Time

3. Evaporator coil is frozen

Yellow “ALERT”

Low Refrigerant Charge

• Check for low suction pressure

Flash Code 1

Compressor is running extremely

•

Check for excessively low thermostat setting

 

long run cycles

•

Check evaporator airflow (coil blockages or return air filter)

•Check ductwork or registers for blockage

4.Faulty metering device

•Check TXV bulb installation (size, location and contact)

•Check if TXV/fixed orifice is stuck closed or defective

5.Liquid line restriction (filter drier blocked if present in system)

6.Thermostat is malfunctioning

•Check thermostat sub-base or wiring for short circuit

•Check thermostat installation (location, level)

1.Condenser fan is not running

•Check fan capacitor

•Check fan wiring and connectors

 

Compressor (Pressure) Trip

• Check fan motor for failure or blockage

Yellow “ALERT”

High Refrigerant Charge

2. High head pressure

Flash Code 2

Discharge pressure out of limits

•

Check high pressure switch if present in system

 

or compressor overloaded

•

Check if system is overcharged with refrigerant

•Check for non-condensable in system

3.Condenser coil poor air circulation (dirty, blocked, damaged)

4.Return air duct has substantial leakage

 

Pressure Switch Cycling

1.

Time delay relay or control board defective

Yellow “ALERT”

Compressor is running only

Flash Code 3

briefly due to pressure switch

2.

If high pressure switch present go to Flash Code 2 information

 

cycling

 

 

© 2011 Emerson Climate Technologies

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Printed in the U.S.A.

 

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Contents Table of Contents ApplicationEngi EngineeringSafety Instructions Safety Icon ExplanationPressurized System Hazard Safety StatementsElectrical Shock Hazard Burn HazardInstallation IntroductionOperation Service Module Dimensions in Millimeters Wiring Diagram ProtCode Code1Code2 Code4CoreSense Diagnostics LED Troubleshooting Information Trip Locked RotorCompressor Moderate Run Welded ContactorOpen Run Circuit Open Start CircuitOver Current Protection

AE8-1385 specifications

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