Nordyne Air Conditioner Troubleshooting

Do you have broken Nordyne brand air conditioner? Do not rush to call the repairman and lose your money. You may be able to cope with the Nordyne air conditioner troubleshooting on your own. The tables below provide all the necessary information to identify the problem and fix it without much effort.

Nordyne JS4BD Air Conditioner Troubleshooting

Miswired Module IndicationRecommended Troubleshooting Action
Green LED is not on, module does not power upDetermine if both R and C module terminals are connected. Verify voltage is present at module’s R and C terminals.
Green LED intermittent, module powers up only when compressor runsDetermine if R and Y terminals are wired in reverse. Verify module’s R and C terminals have a constant source.
TRIP LED is on but system and compressor check OKVerify Y terminal is connected to 24VAC at contactor coil. Verify voltage at contactor coil falls below 0.5VAC when off.
TRIPLED and ALERT LED flashing togetherVerify R and C terminals are supplied with 19-28VAC.
ALERT Flash Code 3 (Compressor Short Cycling) displayed incorrectlyVerify Y terminal is connected to 24VAC at contactor coil. Verify voltage at contactor coil falls below 0.5VAC when off.
ALERT Flash Code 5, 6 or 7 (Open Circuit, Open Start Circuit or Open Run Circuit) displayed incorrectlyCheck that compressor run and start wires are through module’s current sensing holes. Verify Y terminal is connected to 24VAC at contactor coil. Verify voltage at contactor coil falls below 0.5VAC when off.
ALERT Flash Code 8 (Welded Contactor) displayed incorrectlyDetermine if module’s Y terminal is connected. Verify Y terminal is connected to 24VAC at contactor coil. Verify 24VAC is present across Y and C when thermostat demand signal is present. If not, R and C are reverse wired. Verify voltage at contactor coil falls below 0.5VAC when off.

Nordyne R-410A Air Conditioner Troubleshooting

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 compressor is not running• Compressor protector is open
• Check for high head pressure
• Check compressor supply voltage
• Outdoor unit power disconnect is open
• Compressor circuit breaker or fuse(s) is open
• Broken wire or connector is not making contact
• Low pressure switch open if present in system
• Compressor contactor has failed open
Yellow “ALERT” Flash Code 1Long Run Time Compressor is running extremely long run cycles• Low refrigerant charge
• 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
• Evaporator coil is frozen
— Check for low suction pressure
— Check for excessively low thermostat setting
— Check evaporator airflow (coil blockages or return airfilter)
— Check ductwork or registers for blockage
• Faulty metering device
— Check TXV bulb installation (size, location and contact)
— Check if TXV/fixed orifice is stuck closed or defective
• Condenser coil is dirty
• Liquid line restriction (filter drier blocked if present in system)
• Thermostat is malfunctioning
— Solenoid plug not connected
— Y2 not wired at Comfort Alert
— Check thermostat sub-base or wiring for short circuit
— Check thermostat installation (location, level)
• Comfort Alert failure
System Pressure Trip• High head pressure
— Check high pressure switch if present in system
— Check if system is overcharged with refrigerant
— Check for non-condensable in system
Discharge or suction• Condenser coil poor air circulation (dirty, blocked, damaged)
Yellow “ALERT” Flash Code 2pressure out of limits• Condenser fan is not running
— Check fan capacitor
— Check fan wiring and connectors
— Check fan motor for failure or blockage
Compressor overloaded• Return air duct has substantial leakage
• If low pressure switch present in system, check Flash Code 1 information
Yellow “ALERT” Flash Code 3Short Cycling / Compressor is running only briefly• Thermostat demand signal is intermittent
• Low line voltage (contact utility if voltage at disconnect is low)
• Excessive liquid refrigerant in compressor
• Compressor bearings are seized
Yellow “ALERT” Flash Code 4Locked Rotor• Run capacitor has failed
• Low line voltage (contact utitlity if voltage at disconnect is low)
• Check wiring connections
• Excessive liquid refrigerant in compressor
• Compressor bearings are seized
• Measure compressor oil level
Yellow “ALERT” Flash Code 5Open Circuit• Outdoor unit power disconnect is open
• Compressor circuit breaker or fuse(s) is open
• 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
— High pressure switch is open and requires manual reset
• Open circuit in compressor supply wiring or connections
• Unusually longcompressorprotectorresettimeduetoextreme ambient temperature
• Compressor windings are damaged
— Check compressor motor winding resistance
Yellow “ALERT” Flash Code 6Open Start Circuit Current only in run circuit• Run capacitor has failed
• Open circuit in compressor start wiring or connections
— Check wiring and connectors between supply and the compressor S terminal
• Compressor start winding is damaged
— Check compressor motor winding resistance
Yellow “ALERT” Flash Code 7Open run circuit Current only in start circuit• Open circuit in compressor run wiring or connections
— Check wiring and connectors between supply and the compressor R terminal
• Compressor run winding is damaged
— Check compressor motor winding resistance
Yellow “ALERT” Flash Code 8Welded Contactor Compressor always runs• Compressor contactor has failed closed
• Thermostat demand signal not connected to module
Yellow “ALERT” Flash Code 9Low Voltage Control circuit <17VAC• Control circuit transformer is overloaded
• Low line voltage (contact utility if voltage at disconnect is low)
• Check wiring connections

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