AE8-1379 R2
Status Description Troubleshooting Information
1. Run capacitor has failed
2. Low line voltage (contact utility if voltage at disconnect is low)
Yellow “ALERT”
Flash Code 4
Locked Rotor
• Check wiring connections
3. Excessive liquid refrigerant in compressor
4. Compressor bearings are seized
• Measure compressor oil level
1. 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
Yellow “ALERT” Compressor (Moderate Run)
Flash Code 5 Trip
• Check indoor blower control board
• Check thermostat wiring for open circuit
2. Faulty metering device
• Check TXV bulb installation (size, location and contact)
• Check if TXV/fixed orifice is stuck closed or defective
3. Condenser coil poor air circulation (dirty, blocked, damaged)
4. Low refrigerant charge
“LOCK” Flash Codes
1. Condenser fan is not running
• Check fan capacitor
Compressor (Pressure) Trip;
Red “LOCK” Compressor is locked out
Flash Code 2 after 4 consecutive or 10 total
Yellow Off compressor (pressure) trip
events
• Check fan wiring and connectors
• 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)
Red “LOCK” Short Cycling; Compressor is
1. Thermostat demand signal is intermittent
Flash Code 3 locked out after 10 consecutive 2. Time delay relay or control board defective
Yellow Off short cycling events
3. If high pressure switch present go to Flash Code 2 information
1. Run capacitor has failed
2. Low line voltage (contact utility if voltage at disconnect is low)
Red “LOCK” Locked Rotor; Compressor is
Flash Code 4 locked out after 10 consecutive
Yellow Off locked rotor events
• Check wiring connections
3. Excessive liquid refrigerant in compressor
4. Compressor bearings are seized
• Measure compressor oil level
1. Evaporator blower is not running
• Check blower relay coil and contacts
• Check blower motor capacitor
• Check blower motor for failure or blockage
Compressor (Moderate Run)
Red “LOCK” Trip; Compressor is locked out
Flash Code 5 after 4 consecutive or 10 total
Yellow Off compressor (moderate run) trip
events
• Check evaporator blower wiring and connectors
• Check indoor blower control board
• Check thermostat wiring for open circuit
2. Faulty metering device
• Check TXV bulb installation (size, location and contact)
• Check if TXV/fixed orifice is stuck closed or defective
3. Condenser coil poor air circulation (dirty, blocked, damaged)
4. Low refrigerant charge
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