Why the split system does not blow cold

Check the fan

If conditioner is slightly warm but blows well, look at the outside unit. Probably the fan does not rotate. If so, there are three reasons:

To check variants remove the cover of outdoor unit. Try turning the fan by hand. If it blows hard, check the connection with the pulley. Clean it of ice and dirt. Turn on air conditioner and see if the problem is solved.

If when the fan rotates you hear extraneous sounds (crackling, clicking, creaking), the problem is in the bearing. It must be replaced, it is beyond repair. You can do it yourself by buying the appropriate.

If the fan can be easily rotated by hand, there is a problem with the motor. There are three variants:

Check with a screwdriver-indicator power at the contacts of the connector, through which is connected the wire going to the motor. If there is none, then the problem is with the circuit board. It is impossible to repair it yourself (without the appropriate knowledge), look for a master.

If there is power from the side of the board, check the voltage on the contacts of the motor. If it is absent. the problem is in wires, they are damaged or burned out. Select the appropriate cross section and replace them. Pay close attention to the airtightness, because they are exposed to moisture.

If there is voltage on the pins connected to the motor, then it is out of order. There is no point in repairing it, it is better to replace it. Make it yourself is not difficult, if you buy the appropriate.

There is a possibility that the contacts of connectors oxidized. You can try to clean them with ethyl or ammonia alcohol. Also there are special liquids and aerosols for cleaning the contacts. You can buy them in car dealers.

There are. That conditioner cools, but practically does not blow. Give 99%. the problem is with the fan of the indoor unit. Most likely it is standing or rotating very slowly. There are three possibilities:

  • The fan motor is broken or burned out;
  • The bearing is worn out;
  • Dirt in the connections between the fan and motor prevents it from rotating.
  • First of all wash the fan and its joints with motor, remove all dirt;
  • If it doesn’t spin normally after that. crank it with your fingers and listen;
  • If you hear strange noises where the motor is connected. You feel how something sticks with your hand. the problem is with bearing;
  • If there is no unusual sound and the fan can be easily rotated by hand. the problem is with the motor.

It is possible to change a bearing or a motor by yourself. You will need a Phillips screwdriver, half an hour of time and a desire to. But it is better to call a specialist. maybe the problem is not only in this.

Nine reasons why conditioner does not cool or blows with warm air

split, system, does, blow, cold

Why the conditioner does not cool or blows out with warm air

Nine reasons why the air conditioner doesn’t cool the room. sorting from the most common reasons to the rarer ones.

  • Internal unit filter is clogged with dust. In this case, dirty filter of air conditioner does not let the air through. Air does not flow, so it is not cooled;
  • Winding of the indoor unit fan is burned. The blades are not rotating fast enough for the air to draw all the cold from the radiator;
  • Compressor start-up condenser burned out. In this case, the outdoor unit does not start. In this case, the indoor unit operates as a fan. the air conditioner works, but does not cool;
  • No freon in system. As the result of the leakage there is a lack of freon. Out of ten calls for repair, there is only one charge;
  • The conditioner is overcharged with freon. Elevated freon pressure as a result of charging error;
  • The protection against overheating in the outdoor unit is triggered. For example, it can be clogged with dust, feathers or poplar fluff or it is installed on a closed balcony. Insufficient fresh air circulation around it will cause the unit to overheat and shut down;
  • Non-functional compressor. The winding is burned out or the compressor piston is jammed. The most expensive type of repair;
  • The fuse of the outdoor or indoor unit has blown;
  • Very often the users simply do not know how to turn on the split. system in required mode. FAN or HEAT mode is set instead of COOL mode.

The internal unit of air conditioner works independently from the external one. The external unit can be absent (knocked down by a fallen piece of ice in winter, stolen, dismantled earlier), and even in this case the internal unit will work.

The cold is generated in the outdoor unit, from which, through copper pipes, it is carried inside the room. The main reasons why the outdoor unit does not work are:

  • Lack of freon;
  • The failed motor starter;
  • The compressor is burnt out. wedge, intercircuit, breakdown on the case);
  • Dirty radiator;
  • Broken freon pipes.

What You Can Do Yourself, If Your Air Conditioner Isn’t Cooling

The first thing to do is to check the settings on the remote control. Press “MODE” button to select “COOL” mode and set the temperature below the ambient temperature. Increase the fan speed by pressing the “FAN” button several times. Make sure the outdoor unit is working. installed outdoors. Secondly. clean the filters. The filter is washed in warm running water. If the air conditioner blows warm air after the above operations, you can confidently call a repairman.

How long will it take to fix the problem

In standard cases it takes from twenty minutes to one and a half hours to diagnose and fix the problem. that’s 80% of all calls. The standard repair can include:

The conditioner does not cool and does not drip. the reasons and decision

Before you continue reading this material, make sure that:

  • You chose, on the remote control of air conditioner, the mode. “Cool” cooling;
  • Set the lowest possible temperature. 16-18 degrees, depending on the brand;
  • Set the maximum possible rotation speed of the fan;
  • Check air filter, fan and radiator for a large layer of dust.

If the air conditioner does not cool or drip condensation when properly turned on, with clean filters and radiator, there is a clear malfunction in the system.

There can be many reasons why there is no water dripping from the air conditioner and no cooling, let’s look at the most common ones below, from simple to complex:

  • Dirty radiator of outer unit. clogged with fluff or dirt;
  • Lack of freon. leakage in the system;
  • The fan of the external unit does not turn on. the motor is jammed, the motor starter is out of order, there is an error in the control board;
  • The starter (condenser) of the compressor malfunctions and the compressor cannot start;
  • Compressor malfunctioned. wedge or winding short circuit;
  • Four-way valve defective. soiled or short-circuited winding.

If radiator is heavily fouled, flush it with running water from top to bottom. After that, feel the tubes coming out from the outside unit: the thin tube should be very cold, the thicker one is warmer. Cleaning the radiator did not help. call a specialist!

No water dripping when the air conditioner is operating. The air conditioner is cooling

If during the air conditioner functioning the water drips from the drain hose, but there are no drops from the indoor unit, it means that freon level in the system is insufficient. Freon is there, its quantity is enough to cool a radiator to below room temperature, but not enough to achieve the performance of the production. the split. the system cools worse.

Water does not flow from the air conditioner at low room temperatures or low humidity. Condensate tends to accumulate, with a clogged drain, in the drain pan and hose, after filling the indoor unit begins to run water. If you use the air conditioner for a long time, it cools, there are no drips on the indoor unit, there is no moisture on the walls, but there is no water dripping from the tube of the air conditioner leave everything as it is, everything works in a normal mode.

No condensate dripping from the outdoor unit

Condensate is not dripping from the outdoor unit in cooling mode because the radiator of the outdoor unit is hot. This should not happen in cooling mode.

The condensate should drop only in a mode of work of the split-system on heat during defrost. At low temperatures, external radiator is covered by a layer of snow that reduces its performance. To solve this problem, there is a defrost mode. which turns on periodically, melting the snow on the slats. That’s when water starts dripping from outer side.

Air conditioner leaks after turning off

Air conditioner is cooling, drainage is working, but after turning off, after several minutes water starts dripping from indoor unit:

Cause: Radiator freezes during operation, after switching off, ice melts and melted water drips on the floor.


To the basic breakdowns of fans of split-systems outer and inside blocks belong:

  • Failure of blades (more common on outdoor units, where frosting is observed, large debris can enter).
  • Engine winding conductors breakage (inter-turn short circuit or to unit frame) or their breakage.
  • Shaft deformation and jamming.
  • In three-phase systems. improper phase rotation or connection of fewer phases.
  • In fans with AC motors. failure of capacitor on windings.

Internal, typically centrifugal designs, many with the impeller integrated with the motor rotor. In this case the only repair option will be replacement of.

For diagnostics of other problems you should

  • De-energize the system.
  • Disconnect wires to electronic block.
  • Measure the winding resistance (the manufacturer specifies the operating values in the technical documentation).
  • Check the winding capacitor.
  • If there are no problems. connect conductors, switch on the system, measure voltages and currents (observance of electrical safety rules is required, an appropriate permission is needed).

By the results of measurements make a conclusion about the efficiency of the fan and the need of its replacement (do not reconstruct the equipment in quasi-customary conditions).

Replacement of the whole unit can solve other problems. jammed shaft, worn out bearings, etc.

Alexander Kuleshov, KLIMATLAB Technical Specialist.RU, kuleshov@klimatlab.ru, 7 (499) 350-46-76

The spring sun is warm and you need to use the device for its primary purpose. But suddenly there is a problem. The conditioner is switched on, but obviously is not able to solve the problem

  • Weak blowing by subjective sensations.
  • Blows normally, but the temperature in the room decreases slightly.
  • Blowing warm air at all.
  • Switches off after a while after it had started working.
  • It works with interruptions and jerks.

The reasons of the listed malfunctions are divided into two kinds: external, connected with mistakes during adjustment and equipment operation or with low-quality electrical supply, and internal, conditioned by mechanical breakage or failure of electronic components of the climatic system.

External causes

Strange as it is, curiosities happen all the time when we start the air conditioner. Users do not change the winter heating mode for the summer cooling and are surprised that conditioner blows warm air. The similar situation occurs when the cooling mode is set, but the temperature is the same as in winter. 25°C or even 30°C. As a result the device just drives indoor air without changing its temperature. In order to cope with the heat quickly it is recommended to set the temperature to minimum when switching on, and then after 20-30 minutes of piercing draught choose the comfortable mode. It is more reasonable to leave a room for the time of dispersal.

Quite often the designed capacity of an air conditioner does not correspond to the volume of a premise. The situation is aggravated by untightness of the object. the cool air is leaking into the open windows, doors and technological gaps. If the outlet of the air conditioner is blocked by furniture, curtains, blinds and other mechanical barriers, it also reduces the efficiency of the climate system.

Poor power supply can affect the performance of the compressor, the heart of the air conditioner. If the mains voltage is insufficient, the rotor winding quickly overheats and a protective thermostat switches the compressor off automatically. Fans of both units continue to operate, but refrigerant circulation stops and air conditioner starts blowing warm air, despite the set minimum temperature mode.

At such malfunctioning, typical for rural area, the only effective method is buying of voltage stabilizer. The faulty conditioner can be used not only for air-conditioning but also for other power-consuming appliances, such as electric boiler or heating elements, washing machines and dish-washers, kitchen stove and etc.д.

Internal Causes

often the causes of split-systems malfunctions are hidden inside the external and internal units. At the same time, some of the malfunctions can be eliminated by users themselves, for the treatment of others it is necessary to turn to the masters.

To the first category of problems can be referred:

  • Clogging of fine and coarse filters of internal unit. Dust, human hair and pets’ hair clog the grid, accumulate on the heat exchanger plates and penetrate deep into the shell. The result is the bad heat giving off by evaporator (the main negative effect), freezing of tubes of evaporator, clogging of drainage tube. The condensate cannot find its way out and the water starts to drop from the air conditioner. It is possible to clean filters by one’s own hands, the main thing is to follow the instructions, for example, not to wash the lattice with hot water. Another result of a severe clogging is that the air conditioner works jerkily, as if spitting out air. This indicates that foreign matter or ice is obstructing the free rotation of the indoor unit drum and fans at the cold air outlet.
  • Contamination of the radiator of the outdoor unit. Occurs the more often the lower the floor and the more dust and cinders in your area. When it’s hot in July, the problem is aggravated by notorious poplar down and pollen of other flowering plants. Public insects (ants, wasps) can build nests in air conditioners. As a result, the heat exchange between the ambient air and the condenser gets worse and again the compressor shuts down from overheating. Outside unit is usually cleaned with a special device. steam generator or high pressure washer (by the name of a popular manufacturer they are often called Kerchers). If you live or work high up, you will have to call an industrial climber.

Now about the malfunctions, which can not be fixed by yourself, simply because you need professional equipment.

  • Lack of refrigerant in the refrigerating circuit. Error indication shows pressure drop. Physical manifestation. frequent switching off of compressor for no apparent reason. It leads to the situation when conditioner blows a little, but it cools badly or stops to cool completely. In other words, the cooling capacity of the device decreases while the power is maintained. With this diagnosis the only treatment is topping up with Freon, annual cleaning of the circuit is also indicated. If a freon leak is evident, the service technician will find the weak spots and seal them.
  • Capillary tube in the refrigeration circuit connecting the outdoor and indoor units is clogged. Because of the mechanical barrier freon begins to boil not in the evaporator, but still on the way to it. The walls of the house and the air outside are cooled instead of the room. There are ice crusts and even stalactites on the tube. Treatment. disassembly of the refrigeration circuit and its complete cleaning. In some cases full tube replacement is needed.
  • The split system blows with cold air, but shuts down very quickly. This can be caused by broken thermistor, room temperature sensor. Need to replace it. If you are a professional electrician or assembler of the equipment, the work can be done on your own. If not, call a professional.
  • Air conditioner blows with warm air and does not react on the remote control and control panel. Communication between indoor and outdoor unit is most likely lost. It is necessary to test and restore electric circuits.

Compressor breakage is the special danger for the further life of air conditioner. In this case, the indoor unit pumps room air without cooling it. The most common problems with the compressor are the following:

  • rotor jamming;
  • Electric breakdown of winding;
  • Inter-roll short circuits;
  • electric wiring breakage.

In all listed cases prognosis of maintainability is doubtful, most likely the compressor will have to be replaced or even a new split-system will have to be put. Professionals have the final say.

comforting diagnoses are the breakage of condenser’s thermostat or compressor’s power supply unit. These components can be successfully replaced.

Conditioners, as well as any other complex technique, do not like dilettantes. Not any perfect split-system, window conditioner or autonomous device-monoblock are insured from malfunctions and failures. But the disease should be treated by an experienced doctor, but not by an illiterate healer. If your climate system does not provide normal cooling of the room, works unstable, pushes the air jerkily or spontaneously shuts down, you need a professional diagnosis of faults.

Learn more about how to find out why the air conditioner is not cooling and how much it costs to repair it from the specialists of ClimateLab on the website repair-air conditioner.Moscow or call 74993504676. If the fan coil does not cool well then, on the website of repair-fancoil.moscow. If there’s a problem with your chiller, the chiller repair website.moscow.

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Why does not the air conditioner cool??

Many users of household air conditioners are faced with the fact that the equipment does not cool the air, and blows warm. Most often it is observed after a long period of idle time during winter. Before looking for causes of technique malfunction it is necessary to exclude external factors, which can influence its cold-productivity.

For example, wrong air conditioner selection leads to the situation when its capacity is not enough to cool the premise effectively (especially if it is very hot weather outside). Also the problems can be connected with bad isolation of a room, because of which warm outside air constantly enters the premise. In addition, various obstacles such as furniture, curtains, or blinds can impede normal air circulation and cooling.

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Defective conditioner has to provide the temperature difference between an input and an output within the limits of 7-15 degrees. Measure the inlet temperature near the air intake grilles and the outlet temperature near the louvers. If the difference exceeds the passport indicators at the maximum power of the equipment, the problem is most likely in the malfunction of the internal components of the equipment.

Independent elimination of problems with conditioner

Let’s see what problems with split-systems can be eliminated by your own hands:

Sign Possible reason Means of treatment
Conditioner does not cool a room The temperature is set too high in the settings For fast cooling, it is better to choose the minimum temperature, and then switch to a comfortable
Appliance turns on, but blows warm air The fan or heating mode is chosen Switch the split-system to a cooling mode
Split system blows warm air. The compressor which is in an external unit, does not operate at all or operates for short time intervals Low voltage in the network. It causes overheating of the compressor electric motor and its emergency switching-off It is necessary to install a voltage regulator on the conditioner or on the whole electric network in the house

How to check if the air conditioner is faulty?

The main characteristic of climate equipment is the cooling capacity, which determines how efficiently an air conditioner works. The power of cooling is always selected based on the size of the room: it is believed that for 10 m 2 (with ceilings of 3 m, no more) enough 1 kW.

Diagnostics is the first operation, which should be done by the owners of equipment, if there is a sudden suspicion that split-system has stopped cooling. Quite often the equipment is still in order, but external factors and nothing else are to be blamed for its ineffectiveness. There can be several reasons of high air temperature.

Short period of work

After turning on a conditioner the owners are entitled to expect that the coolness will replace the heat quickly, but the device work takes some time. In order to cool air in the premise the equipment needs from 10 up to 20 minutes. But these figures are not a rule for all. Much depends on the size of the room, the temperature inside and outside, the power of the split-system.

Matching capacity and size

If split-system suddenly stopped cooling in hot weather, it is necessary to consider another variant. Probably, the device of not enough power was bought, that is why it is not able to be effective for a large premise. It is not rare when choosing equipment, when buyers make a mistake: they buy an air conditioner with less capacity than the one that is necessary for the room. This discrepancy is revealed only in “hot heat”.

Constant inflow of air from the outside

This is one more reason, when correctly working split-system is not able to cope with its task. If warm air is constantly inflowing from the street because of the open doors and windows, then it is, at least, strange to expect miracles from qualitative climatic equipment. In this case cold masses will be constantly replaced by warm ones and conditioner simply will not be able to provide the air cooling.

Circulation problems

There is one more potential “stumbling block”. The reason why split-system has stopped cooling may be the obstacle which blocks the way of air masses. Possible obstructions. blinds, furniture, etc. д.


If none of the above has a negative impact on the operation of the split system, and the air cooling is still not happening, then the next step for the owners should be a simple diagnosis. They need to check the air temperature. first at the inlet, then at the outlet:

  • the input value is measured near the air intake grilles: the thermometer is simply placed on the equipment;
  • the output value is measured by placing the measuring device in the air stream coming out of the air conditioner louvers.

It is not recommended to use a mercury thermometer for checking, which can poison the air with toxic vapors if you are not careful. When the difference between obtained values is from 7 up to 15°, it is possible to speak about conditioner’s serviceability. If the figure is lower, it will be evidence of problems with the equipment, which means that owners will have to look for the causes.

Mechanical clogging of the heat exchangers

As it is known from physics, the basis of normal cooling operation of split-system is the heat exchange between freon, being in liquid or gaseous state, and environment. One of these heat exchangers is outside and gives off heat or cold to the atmosphere. The other one, in the internal block provides cooling or heating of the premise.

The worse is heat-exchange, the weaker conditioner will work on cold (as well as on heat). Deterioration is usually connected with contamination of copper-aluminum surface.

This occurs inevitably as a result of two main factors:

  • Surface of heat exchangers for improvement of the process is made ribbed and its construction reminds an automobile radiator. Tubes and ducts are connected by plates, which are separated one from the other by rather narrow slits. Dust clogs this space according to the principle of a chain reaction: some fibers cling from the air to others.
  • Both heat exchangers are blown by fans. As a result a continuous stream is created, which, as a vacuum cleaner, draws all the dust in the room, and it is deposited on the copper radiator. Outdoors, it is added with poplitee fluff or dust from the neighboring construction site.

What to do. Clean your split system regularly. Scheduled cleaning should be done at least every two seasons, and preferably every year. In order to fully treat the surfaces of heat exchangers, it is recommended to use a high pressure washer or a professional steam generator.

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