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© 2011 Emerson Climate Technologies
Printed in the U.S.A.
AE8-1385
Application Engineering
BULLETIN
Yellow “ALERT”
Flash Code 4
Locked Rotor
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
Yellow “ALERT”
Flash Code 5
Compressor (Moderate Run)
Trip
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/fi xed orifi ce is stuck closed or defective
3. Condenser coil poor air circulation (dirty, blocked, damaged)
4. Low refrigerant charge
Yellow “ALERT”
Flash Code 8
Welded Contactor
Compressor always runs
1. Compressor contactor has failed closed
2. Thermostat demand signal not connected to module
Yellow “ALERT”
Flash Code 9
Low Supply Voltage
Voltage below 18V
1. Control Circuit transformer is overloaded
2. Low line voltage (contact utility if voltage at disconnect is low)
“LOCKOUT” Flash Codes
Red “LOCKOUT”
Flash Code 2
Yellow Off
Compressor (Pressure) Trip
Compressor is locked out
after 4 consecutive or 10 total
compressor (pressure) trip events
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)
4. Return air duct has substantial leakage
Red “LOCKOUT”
Flash Code 3
Yellow Off
Pressure Switch Cycling
Compressor is locked out after 4
consecutive or 10 total pressure
cycling events
1. Time delay relay or control board defective
2. If high pressure switch present go to Flash Code 2 information
Red “LOCKOUT”
Flash Code 4
Yellow Off
Locked Rotor
Compressor is locked out after 10
consecutive locked rotor events
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
Table 2 Continued