Nordyne air conditioner troubleshooting

Before contacting the customer service, you can try to repair the air conditioner yourself. This is a responsible thing to do, limited by the possibilities, lack of basic knowledge and special equipment. However, some breakdowns might be handled without additional help and without using expensive services of repair companies.

Status LEDStatus LED DescriptionStatus LED Troubleshooting Information
Green “POWER”Module has powerSupply voltage is present at module terminals
Red “TRIP”Thermostat demand signal Y is present, but the compressor is not running1. Compressor protector is open 1 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. Low pressure switch open if present in system
6. Compressor contactor has failed open
Yellow “ALERT” Flash Code 1Long Run Time1. Low refrigerant charge
Compressor is running extremely long run cycles2. Evaporator blower is not running
3. Evaporator coil is frozen
4. Faulty metering device
5. Condenser coil is dirty
6. Liquid line restriction (filter drier blocked if present in system)
7. Thermostat is malfunctioning
8. Comfort Alert Failure
9. Comfort Alert Failure
Yellow “ALERT” Flash Code 2System Pressure Trip1. High head pressure
Discharge or suction pressure out of limits or compressor overloaded2 Condenser coil poor air circulation (dirty, blocked, damaged)
3. Condenser fan is not running
4. Return air duct has substantial leakage
5. If low pressure switch present in system, check Flash Code 1 information
Yellow “ALERT” Flash Code3Short Cycling1. Thermostat demand signal is intermittent
Compressor is running only briefly2. Time delay relay or control board defective
3. If high pressure switch present go to Flash Code 2 information
4. If low pressure switch present go to Flash Code 1 information
Yellow “ALERT” Flash Code 4Locked Rotor1. 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 5Open Circuit1. Outdoor unit power disconnect is open 1 Compressor circuit breaker or f use(s) is open
3. Compressor contactor has failed open
• Check compressor contactor wiring and connectors
• Check for compressor contactor failure (burned, pitted or open)
• Check wiring and connectors between supply and compressor
• Check for low pilot voltage at compressor contactor coil
4. High pressure switch is open and requires manual reset
5. Open circuit in compressor supply wiring or connections
6. Unusually long compressor protector reset time due to extreme ambient temperature
7. Compressor windings are damaged
• Check compressor motor winding resistance
Yellow “ALERT” Flash Code 6Open Start Circuit1. Run capacitor has failed
Current only in run circuit2. Open circuit in compressor start wiring or connections
• Check wiring and connectors between supply and the compressor “S” terminal
3. Compressor start winding is damaged
• Check compressor motor winding resistance
Yellow “ALERT” Flash Code 7Open Run Circuit1. Open circuit in compressor run wiring or connections
Current only in start circuit• Check wiring and connectors between supply and the compressor “R" terminal
1 Compressor run winding is damaged
• Check compressor motor winding resistance
Yellow “ALERT” Flash Code 8Welded Contactor1. Compressor contactor has tailed closed
Compressor always runs2. Thermostat demand signal not connected to module
Yellow “ALERT” Flash Code 9Low Voltage1. Control circuit transformer is overloaded 1 Low line voltage (contact utility if voltage at disconnect is low) • Check wiring connections
Control circuit < 17VAC