AE8-1379 R2
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.
Status Description Troubleshooting Information
Solid Yellow “RUN”
Module has power and operating
normally
Supply voltage is present at module terminals
1. Compressor protector is open
• Check for high head pressure
• Check compressor supply voltage
Thermostat demand signal Y is
Solid Red “TRIP” present, but the compressor is
not running
2. Outdoor unit power disconnect is open
3. Compressor circuit breaker or fuse(s) is open
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; Compressor
Yellow “ALERT” is running extremely long run
Flash Code 1 cycles indicative of low capacity
due to a system low-side fault
3. Evaporator coil is frozen
• Check for low suction pressure
• Check for excessively low thermostat setting
• 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
Yellow “ALERT”
Flash Code 2
Compressor (Pressure) Trip;
Discharge pressure out of limits
or compressor overloaded
• Check fan motor for failure or blockage
2. High head pressure
• Check high pressure switch if present in system
• Check if system is overcharged with refrigerant
• Check for non-condensable in system
3. Condenser coil poor air circulation (dirty, blocked, damaged)
1. Thermostat demand signal is intermittent
Yellow “ALERT” Short Cycling; Compressor is
Flash Code 3 running only briefly
2. Time delay relay or control board defective
3. Low or high pressure switch is cycling
© 2015 Emerson Climate Technologies
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