Errors of Aux air conditioners: search and correction of irregularities in the operation of the unit

Wouldn't it 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 is the cause of the malfunction.

The 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.

In order to determine the cause of the 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 about how to identify the violation and restore the equipment to work. Our tips will come in handy for home craftsmen.

Features of AUX brand air conditioners

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

In the household and semi-industrial segment of climatic equipment, the most diverse types and technologies of equipment are presented. The company produces conventional and inverter installations. The range includes wall and cassette split systems, mobile floor models, etc.

Wall systems are usually installed in private homes and apartments, while cassette air conditioners are installed in office, commercial and industrial premises. The quality of AUX air conditioners is highly dependent on OEMs. It is better to take Aux equipment from specialized firms. In such companies, it is more likely to buy quality equipment.

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

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

It is impossible to start a split-system at lower temperatures without additional technical preparation. The operation of climatic equipment at negative temperatures can lead to its breakdown. Also, the air conditioner in heating mode is not considered an alternative to heating.

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

Breakdown of AUX brand air conditioners

AUX air conditioners are reliable enough, but they break down from time to time. Before the device is repaired, it must first be fully diagnosed.

During the 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;
• weekend blinds;
• drainage system, etc.

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

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

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

If a fan breaks down, the system usually turns on for a few seconds and then turns off again. This may indicate faults in the fan blades, motor and capacitor. The nature of the breakdown is determined by checking the resistance of the windings with a tester.

If any of these faults occur, the part must be replaced. Fan repair takes no more than an hour or two. You can do it yourself or contact the service center.

In the event of a compressor breakdown, the air conditioner does not turn on at all or turns on for a few minutes. Sometimes there is a strong hum when turning on the unit. Also, with this malfunction, there is a frequent change in the stop and start cycles.

This can happen due to incorrect switching of phases, breakdowns of the condenser, failure of the expansion valve and filling the compressor crankcase with liquid freon. In most cases, you can limit yourself to repairing the compressor; you do not need to completely change the part.

Phase imbalance problems usually indicate improper load distribution in the network. The phase connection is checked with a clamp meter. If problems are detected as a result of this measurement, the load is redistributed.

If the crankcase is filled with liquid coolant, it is necessary to bleed the freon, evacuate the system and charge the circuit. It is also necessary to reconfigure the operation of the pressure condenser regulator.

Electronic malfunctions in air conditioning equipment are considered the most serious. A hardware failure 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 soldered and new ones are soldered in their place, checking in parallel the buffer microcircuit.

Sometimes the cause of a malfunction of the control board is an interconnect error during the installation of equipment. In this case, diode bridges, a voltage stabilizer or a 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.

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

But before any diagnostics and repair of climatic 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 was installed exactly there, then the device will not be able to create the desired temperature regime, and therefore periodically it will issue errors. After all, the air conditioner will constantly be in operation and heat up, as a result it will break down quickly enough.

In case of incorrect installation of the split system and violation of the basic technical requirements during its installation, it will not work correctly.

For example, if the slope of the drain tube is insufficient, the condensed water cannot be completely removed from the device. This can lead to its breakdowns, 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 symptoms of a split system malfunction

If the Aux split system breaks down, first need to clean. The reason for the breakdown of the device may be ordinary dirt, so you need to exclude it immediately. A layer of dust on the device reduces its efficiency by about 2-2.5 times.

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

These signs include:

1. Indoor unit operation without cooling. In this case, the blinds of the indoor unit open, the fan rotates, but the air temperature in the room remains unchanged.
2. Water leaks from the indoor unit.
3. The lack of response of the air conditioner to pressing the buttons on the remote control.
4. Sudden shutdown of the split system after prolonged operation.
5. Compressor and fan problems.

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

The air conditioner 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 starting capacitor of the compressor;
• combustion of the compressor power contacts;
• failure of the compressor;
• breakdown of the control board.

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

In most cases, freon leakage occurs in the joints of copper pipes along air conditioner trackbetween the indoor and outdoor units. Oil remains at the leak and dust adheres to it.

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 is solved by adding refrigerant during the annual service.

To prevent the refrigerant from evaporating too much, it is advisable to clean the equipment promptly. It is necessary to undergo service maintenance and periodically refuel the split system.

If this is not done, the system will have low pressure due to a lack of freon. And due to low pressure in the line, freezing of the pipes and the heat exchanger can occur, which ultimately will lead to compressor breakdown.

Severe leaks and their consequences are usually eliminated by soldering. The burner heats up the place of the freon leak on the pipe and is sealed with solder. In addition, leaking tubes can be completely replaced by soldering them with nitrogen.

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

In addition, insufficient development of the capacity of the air conditioner can be associated with a weak voltage in the mains. In this case, the split system will not work correctly. If this malfunction is detected, the climatic technology should be turned on through the stabilizer.

Water leaks from the air conditioner

Water leakage from a split system is most often associated with a clogged drain hose or tray. To eliminate this problem, it is necessary to disassemble the indoor unit and clean the drainage system. Also, such leaks can be associated with defects in the condensing liquid collection system.

Those. usually water flows out of the block due to structural imperfections. 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.

Sudden shutdown of the air conditioner

If the air conditioner is running for a long time and then suddenly turns off, it may indicate overheating. compressor, clogged capillary tube, inoperative fans and malfunctions electronics. Electronic failure is the most difficult violation that requires the participation of a technician in fixing the problem.

Finding electronics problems should start with the vulnerable parts: fuses and transformers. If you find burnt parts, 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 air conditioners have a self-diagnostic system, which, when a malfunction is detected, displays equipment error codes on the display. This is a hint where to look for the cause of the problem. Failure encoding consists of numbers and Latin letters. The error indication on different models of climate technology may differ slightly.

Unified commands include:

1. Type of failure Display of digital pipe (without alphanumeric designation) - malfunction of the display of the indoor unit.
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 of the outdoor unit of the air conditioning equipment (Outdoor protection function).
6. E6 - errors in the fan motor of the indoor unit of the split system.

At the same time, 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 highlighted.

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

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

When there is errors E4 the air conditioner usually 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 air conditioner.

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

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

Crashes of individual models

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

The E6 code may have different meanings depending on the types of split systems. For three-phase outdoor units of air conditioners with index 36 and higher (the only exception is 36A4 model), this indicator indicates rephasing or undervoltage in the system.

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

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

With some malfunctions of the Aux air conditioner, no signals are displayed on the panel, and only indirect symptoms indicate breakdowns. If the split system continues to work, but the yellow timer LED on the case flashes (2 times), this indicates a problem with the temperature sensor on the condenser.

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

If you find any malfunction, you should disconnect the device from the mains to avoid accidental failures. If after half an hour after switching off the device is turned on and the air conditioner is not working properly, it is recommended to contact the Aux service center.

Conclusions and useful video on the topic

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

The video below describes the most common problem with air conditioners - Freon leakage:

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

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