Emerson Coresense Diagnostics Bulletin page 11

Status
Yellow "ALERT"
Flash Code 4
Yellow "ALERT"
Flash Code 5
Red "LOCK"
Flash Code 2 after 4 consecutive or 10 total
Yellow Off
Red "LOCK"
Flash Code 3 locked out after 10 consecutive
Yellow Off
Red "LOCK"
Flash Code 4 locked out after 10 consecutive
Yellow Off locked rotor events
Red "LOCK"
Trip; Compressor is locked out
Flash Code 5 after 4 consecutive or 10 total
Yellow Off compressor (moderate run) trip
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Description
Locked Rotor
Compressor (Moderate Run)
Trip
"LOCK" Flash Codes
Compressor (Pressure) Trip;
Compressor is locked out
compressor (pressure) trip
events
Short Cycling; Compressor is
short cycling events
Locked Rotor; Compressor is
Compressor (Moderate Run)
events
Troubleshooting Information
1. Run capacitor has failed
2. Low line voltage (contact utility if voltage at disconnect is low)
• 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
• 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
1. Condenser fan is not running
• Check fan capacitor
• 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)
1. Thermostat demand signal is intermittent
2. Time delay relay or control board defective
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)
• 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
• 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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AE8-1379 R2