Unionaire Air Conditioner Error Codes

Error Code	Meaning
E1	Room Sensor Missing. Flashing Led: Power
E2	Indoor Sensor Missing. Flashing Led: Power+Sleep
E3	Outdoor Sensor Missing. Flashing Led: Power
E4	Compressor Overload. Flashing Led: Power+Cool
E5	Insufficient cooling or heating ''due to'' ; Incorrect voltage, Gas leakage, Indoor sensor. Flashing Led: Power+Cool
P1	Over voltage or too low voltage protection
P2	emperature protection of compressor top.
P0	IBM malfunction or IGBT over-strong current protection
P1	Over voltage or too low voltage protection
P2	Temperature protection of compressor top.

How to Fix Error Code E1?

Room Sensor:  this code means that the circuit board is not receiving a signal from the sensing bulb mounted in front of the evaporator coil. Diagnosis:  visually inspect and/or use an ohmmeter to check the following:

• Sensor has come unplugged from the PC board.  OR
• Sensor has failed and must be replaced.  OR.
• Sensor wire has shorted or opened necessitating the repair of the wire.

How to Fix Error Code E2?

Indoor Sensor:  this code means that the PC board is not receiving a signal from the copper sensing bulb mounted to the side of the evaporator coil. Diagnosis:  visually inspect and/or use an ohmmeter to check the following:

• Sensor has come unplugged from the PC board.  OR.
• Sensor has failed and must be replaced.  OR.
• Sensor wire has shorted or opended necessitating the repair of the wire.

How to Fix Error Code E3?

Outdoor Sensor:  (Heat Pump Only) this code means that the PC board is not receiving a signal from the copper sensing bulb mounted to the copper tubing near the condenser coil. Diagnosis:  visually inspect and/or use an ohmmeter to check the following:

• Sensor has come unplugged from the PC board.  OR.
• Sensor has failed and must be replaced.  OR.
• Sensor wire has shorted or opened necessitating the repair of the wire, since this wire runs through one or more walls, the likelihood of the wire being cut is probable.

How to Fix Error Code E4?

Compressor Overload: this code means that one of the safety overloads on the compressor has activated. Diagnosis: the compressor has both an electrical and a temperature overload device built into it. The thermal overload will trip if the gas temperature reaches 154.4° Fahrenheit. This error can be reset by turning the unit off and on. Try one of the following solutions:

• High ambient temperature, with a low ambient kit installed, Unionaire systems will function up to 122° Fahrenheit.
• Blockage in the refrigerant circle, make sure both service valves are fully open, a high pressure on the liquid side, over 350 psig, and a low suction side, under 40 psig, indicates a blocked cap tube. If a blockage is diagnosed, the system must be evacuated, blown back and cleared. It is recommended that a filter/dryer be installed in the vapor line before pumping down and recharging.
• Condenser fan not working, if the compressor runs, but the fan does not, the motor or its capacitor may have failed. Repair or replace as necessary.
• Compressor problem, if the compressor has developed internal faults, it could simply be starving for oil. Examine the installation of the unit to insure that the refrigerant lineset has been trapped properly to facilitate oil return. Any other internal problem with the compressor will mean replacement is necessary.
• Compressor wiring, if the compressor and/or its capacitor have been wired incorrectly, the compressor could overload. Rewire as necessary.

How to Fix Error Code E5?

Low refrigerant charge: this code means that the refrigerant charge within the system is not adequate to run it without frosting the coils. diagnosis: the refrigerant charge must be brought to within specified parameters. Possible causes of a low charge could include the following:

• The factory charge in Unionaire condensers is enough for the whole system with 13 feet of lineset, but may have been short, see the temperature/pressure chart to charge it within specifications.
• Leaking, the system may have a leak which must be located with a refigerant detector, or by a sop test, most leaks can be braised up, however, if a component such as a 4 way valve has developed a leak, it will need replacing.
• Lineset lengthened and/or increased in diameter.  A lineset longer than 13 feet, or larger in diameter than that with which it came will require that additional refrigerant be added.
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Unionaire Air Conditioner Error Codes E2,E3,E4,E5,E1

Unionaire AC Troubleshooting

Problem: The unit can not be restalted just after shut down. ( RUN lamp is illuminating )

Solution: Restart is stopped for 3 minutes afler shut down to protect the unit. Thlee-minute protection timer incorporated in the miomoomputer ectuates automatically. Except that power is connected , this fundion does not actuate.

Problem: Air is not blown out at starting of heating operation.

Solution: Air blow is stopped to prevent blowing out of cold air until the indoor heat exchanger is wenned. ( 2 to 5 min ) ( HOT KEEP)
Problem: Air is not blown out for 6 to 12 min, at heating operation.

Solution: When outdoor temperature is low and humidity is high, the unit sometimes performs defrosting automatically. Please wait. During defrosting, water or steam are raising from the outdoor unit.

Problem: Air is not blown out at DRY operation.

Solution: Indoor fan is sometimes stopped to prevent vapor of dehumidified moisture and save energy.

Problem: Mist is blown out at COOL operation.

Solution: This phenomenon sometimes occurs when the temperature and humidity of the room are very high , but it will disappear with the lowering of the temperature and humidity.

Problem: Odor is sent out.

Solution: Air blown out during operation may smell. This is the smell of tobacco or cosmetics sticked to the unit.

Problem: Noise is heard cracking sound.

Solution: This is caused by the refrigerant that is circulating inside the unit.

Problem: Operation can not be restarted even if the power is recovered.

Solution: The memory circuit of the miclocompumr is cleared. Operate the remote controller again to restart the operation.

Problem: Remote control signals are not received.

Solution: Remote control signals may not be leceived when signal receiver on the air conditioner body is exposed to direct sunlight or strong lighting . In that case , interrupt the sunlight or damen the lighting.