Aux air conditioner errors: how to determine the malfunction and restore the operation of the split system

Isn’t it true, it would be great if any split system breaks down not to look for a repairman or go to a service center.It would be nice to figure out for yourself what the cause of the malfunction is.

Standard errors of the AUX air conditioner can be eliminated with your own hands, because... Most of them are associated with mechanical damage to device parts, malfunctions and wear and tear of equipment.

To determine the cause of a breakdown as accurately as possible, you need to familiarize yourself in advance with the main error codes and signs of typical malfunctions of climate control equipment. We will tell you how to identify the violation and restore the functionality of the equipment. Our tips will be useful to home craftsmen.

Features of AUX brand air conditioners

Aux split systems, which consumers usually encounter, belong to semi-industrial and household models. Industrial air conditioners are installed mainly in large manufacturing enterprises.

The household and semi-industrial segment of climate control equipment presents the most diverse type and technology of equipment. The company produces conventional and inverter installations. The range includes wall-mounted and cassette split systems, mobile floor-standing models, etc.

Wall-mounted systems are usually installed in private houses and apartments, while cassette air conditioners are installed in office, commercial and industrial premises. The quality of AUX air conditioners is highly dependent on the OEM suppliers. It is better to buy Aux equipment from specialized companies.Such companies are more likely to buy high-quality equipment.

Aux air conditioners are presented in several series: FJ, Legend Standart (LS), LS Inverter, Legend Design Inverter and Legend Exlusive Inverter. They are designed for different areas of refrigerated premises. In addition to models with a basic set of functions, there are upgraded versions.

All AUX brand air conditioners are distinguished by their attractive design, versatility and low price, and therefore are popular in the market

Split systems of all AUX series are designed for cooling, heating, dehumidification and ventilation of the room. The cooling function can operate at temperatures from +15 to +43 degrees, and the heating function can operate at temperatures above 0.

It is impossible to run a split system at lower temperatures without additional technical preparation. The operation of climate control equipment at sub-zero temperatures can lead to its breakdown. Also, air conditioning in heating mode is not considered an alternative to heating.

Before starting the air conditioner, you need to check the air temperature in the room and only then turn on this device to the network

There are many varieties of Aux split systems. In terms of functionality, air conditioner models with a similar abbreviation differ little from each other. Their main differences are in appearance, additional features and power.

Breakdowns of AUX brand air conditioners

AUX air conditioners are quite reliable, but they also break down from time to time. Before repairing a device, it must first be fully diagnosed.

During diagnostics, the condition of all parts of the split system is checked:

• fastenings of internal and upper blocks;
• clamps of all contact connections;
• air filters;
• exit blinds;
• drainage system, etc.

During diagnosis, the AUX air conditioner starts in test operation mode. The test mode is similar to the standard one, but during it the equipment does not respond to the room temperature and sensor readings. During diagnostics, key parameters of the split system operation are recorded and errors are identified.

To check the main technical indicators of the air conditioner and search for possible faults, you need to run it in test operating mode

Many errors in household air conditioners can be corrected yourself. Conventionally, all air conditioner breakdowns can be divided into malfunctions of the refrigeration circuit and electronics failures (failure of electrical elements of the system).

Most often, fans in Aux split systems break down, compressors, board or heat exchanger of the outdoor unit. The fact is that the main load during operation of the device falls on them, so these parts wear out quickly.

When a fan fails, the system usually turns on for a few seconds and then turns off again. This may indicate a problem with the fan blades, motor, or capacitor. The nature of the failure is determined by checking the winding resistance with a tester.

To accurately check the resistance and winding, you must first ring the problem area of ​​the device with a multimeter, and then take a megohmmeter

If any of these malfunctions occur, the part should be replaced. Repairing a fan takes no more than an hour or two. You can do it yourself or contact a service center.

If the compressor breaks down, the air conditioner does not turn on at all or only turns on for a few minutes. Sometimes there is a loud buzzing sound when the device is turned on.Also, with this malfunction, frequent changes in stop and start cycles occur.

This can happen due to incorrect phase switching, condenser failure, failure of the expansion valve, and flooding of the compressor crankcase with liquid freon. In most cases, you can limit yourself to repairing the compressor; there is no need to completely change the part.

The compressor is a part of the air conditioner that is necessary to compress freon and ensure its free circulation throughout the working circuit

Problems with phase imbalance usually indicate improper load distribution in the network. The phase connection is checked using current clamps. If this measurement reveals problems, the load is redistributed.

If the crankcase is flooded with liquid refrigerant, it is necessary to bleed off the freon, evacuate the system and refill the circuit. The operation of the condenser pressure regulator should also be reconfigured.

Problems in the electronic part of air conditioning equipment are considered the most serious. A failure in the equipment software can be corrected by reprogramming the system, which is best done in a service center.

The control board may burn out due to power surges or short circuits. In this case, the broken microcircuits are unsoldered and new ones are soldered in their place, checking the buffer microcircuit in parallel.

Sometimes the cause of a control board malfunction is an interconnection error during equipment installation. In this case, the diode bridges, voltage stabilizer or transformer burn out. If the board is completely burnt out, it must be replaced with a new one. Replacing a burnt-out control board is carried out in several stages.

The simultaneous blinking of all split system indicator lamps is usually associated with a failure of the software settings of the control circuit board caused by a non-compliance of the network parameters with GOST standards

First, the power to the device is turned off, after which the housing is disassembled or the top cover of the unit is removed. Then the board is pulled out from the slots (all fixing screws are unscrewed in parallel). After this, a new board is installed, and the block is assembled in the reverse order.

But before any diagnostics and repair of climate control equipment, you need to make sure that it is correctly selected and well installed.

If the power consumption of the air conditioner is not designed for a large room, and the split system is installed there, then the device will not be able to create the desired temperature regime, and therefore it will periodically produce errors. After all, the air conditioner will constantly be in operation and heat up, as a result it will quickly break down.

When choosing an air conditioner for an apartment or house, you need to adhere to basic recommendations on the ratio of the area of ​​​​the cooled room and the power of the split system

If the split system is not installed correctly and the basic technical requirements for its installation are violated, it will not work correctly.

For example, if the slope of the drainage tube is insufficient, the water that falls during condensation will not be able to be completely removed from the device. This can lead to its breakdown, and if the difference in height between the indoor and outdoor air conditioning units is too large, the compressor will pump freon with insufficient pressure.

Typical signs of a split system malfunction

If the Aux split system breaks down, first needs cleaning. The cause of device failure may be ordinary contamination, so you need to eliminate it immediately. A layer of dust on the device reduces its operating efficiency by approximately 2-2.5 times.

A dirty air conditioner not only looks terrible, it also fails to perform its basic functions of cooling and heating. If there is too much dirt, the split system simply stops cooling the air in the room to the required temperature values

If after cleaning the air conditioner does not work, you need to look at other signs to diagnose problems.

These signs include:

1. Operation of the indoor unit without cooling. In this case, the shutters of the indoor unit open, the fan rotates, but the air temperature in the room remains unchanged.
2. Water leaking from the indoor unit.
3. The air conditioner does not respond to pressing the remote control keys.
4. Sudden shutdown of the split system after prolonged operation.
5. Problems with the operation of the compressor and fans.

But if the air conditioner does not work, you must first make sure that it is securely connected to the electrical network. In addition, you need to check the condition circuit breaker and a fuse on the supply line. You should also make sure that all device modes are turned on correctly.

Air conditioning works but does not cool

If the cooling function does not work in the AUX split system, you must first check its settings and operating conditions, as well as the operation of the compressor. If the compressor does not work, then it will not be possible to repair the device without knowledge and experience in this area.

In this case, the cause of the breakdown may be:

• malfunction of temperature sensors;
• problems with the compressor starting capacitor;
• combustion of compressor power contacts;
• compressor failure;
• control board failure.

If the compressor is running, the air conditioner should hum and vibrate slightly. In this case, the problem is a lack of freon (refrigerant). Diagnosis of the refrigerant level is carried out using pressure gauges (they measure the pressure in the system).

In most cases, freon leaks occur in the connections of copper pipes along air conditioner route, laid between the internal and external blocks. At the leak site, oil remains and dust adheres to it.

Freon is a saturated aliphatic fluorinated hydrocarbon, absolutely safe for humans and pets and used in air conditioning for cooling.

A small refrigerant leak (up to 200 g per year) is considered normal and natural. It occurs due to the mechanical connection of the main pipes and due to errors during installation. This problem can be solved by topping up the refrigerant during annual service.

To prevent the refrigerant from evaporating too much, it is recommended to clean the equipment in a timely manner. It is necessary to undergo service maintenance and periodically refuel the split system.

If this is not done, there will be low pressure in the system due to a lack of freon. And due to low pressure in the line, freezing of the tubes and heat exchanger may occur, which will ultimately lead to compressor failure.

Severe leaks and their consequences are usually eliminated by soldering. The burner heats the freon leak on the pipe and seals it with solder. In addition, leaky tubes can be completely replaced by soldering them with nitrogen.

Refrigerant leakage can be detected by measuring the suction line pressure.The suction pressure must not be allowed to drop below zero. In this case, air and moisture will enter the system, which can cause internal corrosion of the compressor.

Electronic leak detectors and chemical leak indicators with special ultraviolet lamps are often used to search for refrigerant leaks in air conditioners.

In addition, insufficient power development of the air conditioner may be associated with low voltage in the electrical network. In this case, the split system will not work correctly. If this malfunction is detected, you should turn on the climate control equipment through the stabilizer.

Air conditioner leaking water

Water leaks from a split system are most often associated with a clogged drain hose or tray. To fix this problem, you need to disassemble the indoor unit and clean the drainage system. Also, such leaks may be associated with defects in the condensing liquid collection system.

The air conditioner drainage system needs to be checked and cleaned regularly as it is a high humidity area ideal for the growth of microorganisms

Those. Usually water leaks from the block due to imperfections in the design. To find the exact cause of the malfunction, you need to disassemble the indoor unit. Then you need to start the air conditioner and determine the breakdown during its operation.

The air conditioner suddenly turns off

If the air conditioner runs for a long time and then suddenly turns off, this may indicate that the compressor is overheating, the capillary tube is clogged, the fans are not working, and the electronics are faulty. Electronics failure is the most complex problem that requires the participation of a specialist in fixing the problem.

Electronic failures in an air conditioner usually occur due to electrical failures, which result in burnout of any parts of the device

When troubleshooting electronics problems, start with the vulnerable parts: fuses and transformers. If burnt parts are found, you need to find the cause of the breakdown and eliminate it. If the fuses and transformers are in order, you need to check the condition of the board: capacitors, relays, voltage stabilizers, diode bridge, etc. But the board is usually not repaired, but replaced with a new one.

AUX split system error codes

All Aux brand air conditioners have a self-diagnosis system, which, when problems are detected, displays equipment error codes on the display. This is a hint where to look for the cause of the problem. The coding of a malfunction consists of numbers and Latin letters. Error displays on different climate control equipment models may differ slightly.

Unified commands include:

1. Type of failure Display of digital pipe (without alphanumeric designation) – malfunction of the indoor unit display.
2. E1 – malfunction of the temperature sensor (thermistor) of the indoor unit. In parallel with this indicator, the yellow timer LED on the indoor unit blinks (once every 8 seconds). The system at this moment is completely stopped and does not respond to external commands.
3. E2 And E3 – evaporator sensor errors.
4. E4 – malfunction of the fan motor (PG feedback motor).
5. E5 – errors in the outdoor unit of air conditioning equipment (Outdoor protection function).
6. E6 – errors in the fan motor of the indoor unit of the split system.

In this case, the exact nature of the error depends on at what point in the operation of the air conditioner one or another indicator on the device was displayed.

Error E3 most often appears after 5-10 minutes of operation of the split system. This may be due to:

• problems with power contacts;
• severe contamination of the filter or evaporator (because of this, the fan accelerates extremely quickly without load;
• malfunctions of the PRM sensor speed sensor, etc.

Whenever E4 errors The air conditioner, as a rule, does not operate in ventilation and cooling modes. But when you turn on the device in heating mode, it immediately gives an error. The problem indicates a malfunction of the fan of the indoor unit of the Aux brand air conditioner.

The indoor unit fan is an important part of the air conditioner, which provides forced air circulation through the heat exchanger by blowing the cold formed on the radiator into the room

When diagnosing an air conditioner, you need to take into account the time at which the error is issued. If the code is displayed when the device is turned off, this may indicate problems with the controller, and not with the part itself.

Those. The controller simply hangs and periodically issues an error code. If, after checking all the elements of the split system, it is clear that they are working properly, you need to check the control board and, if it is faulty, replace it.

Failures of individual models

In addition to standard indicators, there are many error codes specific to a particular air conditioner model. AUX split systems of ALHi, ALCa and ALCe models have an additional interpretation of the error codes that appear.

Code E6 can have different meanings depending on the types of split systems.For three-phase outdoor air conditioner units with an index of 36 and higher (the only exception is model 36A4), this indicator indicates a phase reversal or low voltage in the system.

For outdoor units of split systems with a pressure sensor with an index of 30 or higher, this error code indicates low pressure in the system.

Low pressure in the air conditioner negatively affects the functioning of all its parts, especially the evaporator and condenser.

In cassette-type units, error code E4 indicates an air conditioner drainage failure. In addition to this indicator, the yellow timer LED on the device body blinks. The E2 indicator indicates that the copper temperature sensor is open and there is no signal.

For some malfunctions of the Aux air conditioner, no signals are displayed on the panel, and only indirect signs indicate a breakdown. If the split system continues to operate, but the yellow timer LED on the housing blinks (2 times), this indicates problems with the temperature sensor on the condenser.

If the timer LED on the operating air conditioner blinks green, and no identifiers are displayed on the display, this indicates that the defrosting mode of the outdoor unit has started. Also on AUX air conditioners, blinking of the timer LED 4 times every 8 seconds indicates a malfunction of the power supply.

If any problem is detected, you should disconnect the device from the power supply to prevent accidental failures. If you turn on the device half an hour after turning it off and the operation of the air conditioner is not restored, it is recommended to contact the Aux service center.

Conclusions and useful video on the topic

Error codes for the Aux air conditioner allow you to determine the nature of the malfunction, but before deciphering them, it is better to familiarize yourself in advance with the typical breakdowns of split systems of this brand and how to eliminate them.

The video below talks about the most common problem with air conditioners - freon leakage:

Having determined the meaning of the indication, the owner of the climate control equipment is able to decide on a further action plan. Everything must be done in accordance with the operating instructions and safety regulations. For example, he can fix a minor problem himself, and in case of a more serious breakdown, contact a service center.

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