Air conditioning in your car working properly is an amazing thing. However, if it fails (which, of course, certainly happens on the hottest day of the year), it turns into a real mockery - warm, stale air begins to blow into the cabin. If your car's air conditioner is defective, then you'd better not postpone a visit to a service workshop.
Automotive air conditioning systems have a rather complicated design, which predetermines the complexity of their repair without the necessary equipment and special knowledge. In addition, the refrigerant used in the system has increased environmental requirements. We have highlighted the 3 most common malfunctions of the air conditioning system so that you have an idea of the reasons for its failure.
1.
Refrigerant leakage is unique in itself, as it instantly turns into gas when pressure drops. Closed air conditioning systems in cars are reliably sealed and do not require refueling. If there is not enough refrigerant in the system, it can be concluded that there is a leak that must be repaired.
Leaks from the air conditioning system do not lead to the formation of puddles under the bottom of the car, as happens with antifreeze. And only a professional mechanic is able to find almost imperceptible signs of leakage, for example, oil deposits on the pipe connections. Refrigerant leaks can also occur in the compressor, condenser and / or evaporator, that is, in almost all elements of the system. For their detection, as well as refueling, special equipment is used, including one that uses ultraviolet radiation, which allows you to diagnose and service your car with high quality.
2. Air conditioner compressor wear auto.
The compressor is the heart of the air conditioning system. Its function is to circulate the refrigerant to efficiently dissipate heat from the passenger compartment. Like many other automotive parts, an air conditioner compressor will wear out over time. Due to the complexity of the design, the compressor may fail if dirt enters it or if other elements of the system break down.
How to extend the life of an auto air conditioner compressor.
There are several ways to extend the life of an air conditioner compressor. First of all, run the compressor at least once a month for about 10 minutes (even during cold seasons), regardless of the ambient temperature. This is a very simple operation, as in most modern cars it is switched on together with the heater. Another way is the constant diagnostics of the air conditioning system, which must be performed by professionals.
3. Air conditioning electrical system malfunction.
The air conditioning system includes many electrical wires, fuses, relays and pressure regulators that work together to ensure the safe and efficient operation of the air conditioner. In the event of failure of any of these elements due to wear or defect, an automatic shutdown of the entire system is provided for safety reasons. Without special equipment and, more importantly, the necessary knowledge and experience, it is very difficult to diagnose these problems.
Air conditioning devices are installed in order to create comfortable conditions in the room. Their main task is to cool the air. The heating function has long been considered secondary. But today leading manufacturers have changed their approach to this issue. It turned out that the heating mode can be very useful when the cold weather sets in, before the central heating is turned on. But sometimes situations arise when the system starts to work incorrectly. Why isn't the air conditioner blowing warm air? The reason may be incorrect operation or breakdown of one of the elements of the cooling structure.
Heating air
In order to find out why the air conditioner does not work properly, you should understand how it heats up the air masses. After all, initially, the cooling mode was considered the main function. It turns out that the design of individual mobile systems includes ceramic heating elements. In this case, their operation is similar to that of a conventional heater. The disadvantage of such devices is the high consumption of electrical energy.
Modern models use a different operating principle when heating air. The coolant inside the structure changes the direction of circulation. Condenser and evaporative element change their roles. The air conditioner starts to cool the external air masses. In this case, warm air enters the room.
Cooling unit operation at low temperatures, possible consequences
If the air conditioner does not blow warm air, you should figure out whether it is capable of operating in this mode. Not all structures can heat the air in the room with the onset of winter frosts. Standard cooling systems operate in heating mode only up to a certain negative temperature. Typically this value should not exceed -5 ° C.
When using such devices at lower temperatures, the likelihood of problems increases significantly:
- the oil in the compressor becomes more viscous;
- the cooling substance changes its properties;
- dry start of the compressor can lead to its breakdown;
- operation in extreme mode leads to rapid wear of parts and failure of the entire system.
An ice crust sometimes appears on the surface of the heat exchanger with frost. It melts periodically. The water flows into the sump. Ice forms in it. This could damage the fan. In addition, ice deforms the walls of the heat exchanger, leading to depressurization and leakage of the working substance.
Since heat enters the room from the external environment, when the temperature drops, working conditions become more difficult. The air conditioner needs more energy to heat the air. When certain limits are reached, it can simply turn off and stop working.
Typically, the technical characteristics of the device indicate the temperature range in which its optimal functioning is possible. These parameters should be taken into account and the technique should not be used in an extreme mode.
Reasons for system malfunction in heat transfer mode, solutions to the problem
The following reasons may arise for the poor-quality operation of the cooling device in the heat transfer mode:
- ice plugs appeared in the connecting pipes. They impede the movement of the working substance. Defrosting is not possible during the winter period. You cannot heat the main line. To solve the problem, switch modes of operation. This changes the direction of movement of the coolant. The external module heats up;
- there is not enough freon in the air conditioner. This situation can arise in the event of a leakage and leakage of a gaseous substance. The wizard is invited to troubleshoot the problem. After finding problem areas, he closes them up and refills the system to the desired level;
- dirt appears on the surface of internal parts. It is necessary to periodically remove the decorative cover of the device and clean the main elements and filters;
- breakage of certain parts of the structure may occur. Usually, in this case, a malfunction code appears on the control panel. To restore the operation of the cooling unit, a service technician is called.
Sometimes, immediately after turning on the device, it turns out that it does not work in heating mode. How to make the air conditioner blow warm? Don't panic right away. Such a mode of operation is associated with a change in the direction of movement of the coolant. This takes some time. Also, if there is a negative temperature outside, the compressor should pick up speed. You have to be patient and wait.
Using inverter designs
As mentioned above, classic air conditioning devices are not well suited to operate in heating mode at low negative temperatures. Their efficiency decreases, heat losses increase. The risk of compressor breakdown increases.
Inverter models can be more efficiently used to heat a room, even in fairly severe frosts. There is a way to increase work efficiency. The flow of external air masses mixes with the air in the room. In heating mode, it is necessary to compensate for the smaller temperature difference.
To improve the operation of air conditioners in winter, winter sets of equipment can be used. They consist of the following elements:
- devices for heating the drain system and external connecting pipes;
- Heating elements heating the fan and compressor;
- a device for automatically adjusting the engine speed when the temperature parameters change.
Installing the winter kit allows you to prevent damage to the outdoor unit when it is turned on in borderline conditions and prevents the formation of ice in the drain pipe.
Should I use an air conditioner to heat the room?
The use of a cooling structure for space heating has a number of advantages:
- a sufficient amount of moisture remains in the air;
- no carbon dioxide is emitted;
- heat output is greater than the amount of consumed electrical energy;
- microclimatic conditions in the room are improved.
But along with the merits, there are certain negative aspects:
- the service life of the air conditioner is significantly reduced;
- the oil thickens faster, its characteristics deteriorate;
- The efficiency of the device becomes less than the nominal value;
- the risk of failure of the cooling device increases.
Heat transfer from air conditioning equipment turns out to be quite high and economically justified. Modern models are capable of operating at low negative temperatures. But they are only an addition to the main heating system.
How unpleasant it is for the owner of such a wonderful climatic technology as an air conditioner to find its breakdown! Especially if the air conditioner in the midst of summer not only stopped cooling the room, but began to blow warm or even hot air.
Unfortunately, this kind of malfunction is most often the result of improper care of the air conditioner. You need it clean regularly from dust and dirt on your own, as well as invite a master for a deeper and more complete cleaning, preferably once a year.
Cleaning the air conditioner on time is not too time-consuming or expensive. But if this is not done, more complex and expensive repairs will be required.
Causes and types of breakdowns
The air conditioner blows with warm air when the heat exchanger of the outdoor unit and the filters of the indoor unit are clogged with smoke, fluff, dirt, dust and other debris flying from the street and getting from the room. As a result, the air conditioner compressor overheats and blowing warm. In the end, at one point, the compressor may jam.
Do not delay solving the problem of the air conditioner blowing with warm air, because the more difficult the repair, the more expensive it is.
Types of repair work when the air conditioner blows with warm air:
- cleaning air conditioner,
- repair compressor,
- replacement compressor.
To perform these works, order an air conditioner repair service from VseRemont24! An experienced and competent master will quickly and efficiently cope with any task.
In addition to the above problems, lead to breakdown of the air conditioner:
- Problems with electricity, namely, low voltage in the mains or defective outlet.
- Failure control boards.
- Flaw freon in system. This problem can also cause compressor failure. Until this happens, it is necessary to refuel the unit with freon. In addition, freon is a fairly toxic gas.
Unfortunately, even during incorrect or inaccurate installation of a brand new air conditioner, a breakdown often occurs, leading to a gas leak. As a result, you may not have time to enjoy the coolness of the air conditioner, as you will have to repair it.
Undoubtedly, it is better not to wait until the problem of the lack of freon manifests itself in a particular malfunction, but to order service of charging the air conditioner with refrigerant at VseRemont24 approximately 1-3 times every three years.
As you can see, the problem that the air conditioner began to blow with warm air can only be solved by an experienced and qualified master. However, before contacting VseRemont24, check if the force majeure was caused by ordinary inattention.
Is the temperature on the air conditioner set correctly? Is Heat mode worth it? Also check all other parameters and settings. Re-read the instructions! Perhaps there you will find a solution to the problem if it lies on the surface and does not require special knowledge and skills. For example, it happens that because of the batteries sitting in the control panel, you see some numbers and values on it, but in fact they are different.
In any case, you can rest assured. The VseRemont24 master who came to your house will find and quickly fix the malfunction of an air conditioner of any model and brand.
The exact cost of the repair is determined by the foreman after preliminary diagnostics.
For all types of work performed and installed components, you will be provided with a guarantee.
Although modern models of air conditioners and split systems provide a heating mode, still most users use the equipment only in the summer in the cold. Therefore, the equipment has a downtime. But then the hot time began, you turned on the air conditioner after winter and found that:
- the split system does not cool, but blows with warm air;
- the air conditioner started up, worked and stopped cooling, now the air conditioner is blowing warm, and the temperature in the room does not drop.
We have prepared an article on the reasons why the air conditioner blows, but does not cool the air, to help you understand the situation and decide whether to call a master.
Does the air conditioner really not cool? We carry out diagnostics
Before looking for problems in the split system, check for external causes that are not related to the equipment. In addition to the cooling capacity of the air conditioner itself, the cooling of the room is affected by:
- Working hours of climatic technology. Customers often forget that when the air conditioner is turned on, it does not instantly cool the indoor air. For a noticeable decrease in temperature, it takes 10, 15, 20 minutes. Depending on the size of the room, the temperature outside and inside, and the capacity of the split system.
- Correspondence of the split-system power to external parameters. Naturally, a low-power air conditioner will not be able to significantly cool a spacious room when it is hot outside and the room is very hot. When choosing equipment, it is often overlooked that the load can be peak, and the air conditioner must be taken with a margin of "power".
- Isolation of the room. An air conditioner in an apartment will not cool well if there are "holes in the tightness" of the room: open windows, doors, a working ventilation system. Additional influx of heat from outside or forced outflow of cold air from the room are the reasons that lead to poor cooling.
- "Blocked" air inlet or outlet, another reason. Obstacles in the form of curtains, blinds, furniture interfere with normal air circulation and, as a result, cooling.
If there is enough power, the entrance and exit are free, the windows and doors are closed and enough time has passed, but it has not become cooler, then it is necessary to diagnose the equipment. Simply put, measure the temperature of the air entering and leaving the air conditioner.
The inlet temperature is measured at the air intake grilles. Place the thermometer on the body or hold it in your hand. The output is measured in a stream from the outside or by slightly pushing the thermometer inward through the blinds.
Attention! Do not push the thermometer deep into the housing. It can get caught in the fan blades.
In a working air conditioner, the temperature difference at the "inlet-outlet" is in the range of 7-15 degrees. If you just turned on the air conditioner for maximum cooling, and the difference is less than these values, then your split system does not cool well due to some internal reasons.
In addition, you can check the outlet flow temperature with the nameplate values. Usually, the equipment passport indicates the temperature of the cooling mode at the outlet, for example, 6-14 ° C for non-inverter systems. When turned on, inverters give out the same parameters, and after reaching the set temperature in the room, they slightly raise the output value - up to 12-17 ° C degrees. If the temperature of the outlet flow exceeds the rating, then you should look for a problem inside the air conditioner.
The air conditioner is blowing warm air, what problems can be eliminated by yourself
You can deal with some of the causes of poor cooling yourself. The table summarizes the main ones, and provides recommendations for eliminating equipment failure.
| Sign | Possible reason | How to fix |
| The air conditioner does not cool the room well. | The temperature is set to high in the settings. For fast cooling, it is recommended to select the minimum. And then switch to a comfortable one. | Correct the cooling mode. |
| The air conditioner turns on, but does not cool. | Fan mode selected. And the air just circulates without cooling. | Select a cooling mode. |
| The air conditioner blows warm (for models with heating mode) | Heating mode on by mistake. | Set the cooling mode. |
| Cooling is weak. The indoor unit of the air conditioner may leak and / or freeze. | (coarse and fine cleaning). Dust, wool, hair clog the filters and settle on the heat exchanger plates. Because of what the heat removal from the evaporator worsens: the radiator does not give cold well to the air, which leads to poor cooling. If the indoor unit is heavily soiled, the evaporator tubes may freeze. Dust can also clog the drain hose, then condensation will remain in the pan and then drip from the indoor unit. |
Clean filters. To get them open the cover of the unit. How to do this is described in the instructions. Then remove the filters and rinse well under running cold water and replace the clean ones. Attention! Do not use hot water, filters may be deformed.If you yourself are afraid to "climb" into the indoor unit of the air conditioner, call the master. |
| Poorly cools, the compressor in the outdoor unit becomes silent. | The radiator of the outdoor unit is dirty. The heat exchanger has accumulated dust, fluff from plants, plaque from the "exhaust" of vehicles, the rotation of the fan may be difficult. All this impairs the heat exchange of the condenser with the environment and reduces the refrigerating capacity of the air conditioner. In addition, the compressor may shut down due to overheating. | The outdoor unit needs to be cleaned. You can use a steam generator, pressure washer or mechanical means (brush, sponge). If the house is multi-storey, the services of an industrial climber may be required. |
| Warm air blows. The split-system compressor located in the outdoor unit is silent or turns on for a short time (2-3 minutes) and turns off again. |
Low voltage in the network. Lack of voltage often leads to overheating of the rotor winding and the shutdown of the motor by a thermal relay. |
Install a voltage monitoring relay. It can be used separately or in pair with the stabilizer. |
If the elimination of these problems did not improve the situation and the cooling is still weak or absent, then the problem is in the components and parts of the climatic equipment. In this case, a full diagnostics by a specialist and service repair are required.
Does not cool the air conditioner in the apartment - reasons that require professional maintenance or repair
The symptoms of malfunctions are similar, but they arise due to wear or malfunction of parts, damage, internal contamination of units and mechanisms. Based on the experience of repairing air conditioners, "RemBytTech" masters have compiled a list of major equipment breakdowns.
| Sign | Possible reason | Repair or replacement | Price* (only work) |
| The air conditioner blows poorly and does not cool well. Water may drip from the indoor unit of the air conditioner, and the evaporator tubes may freeze. |
Indoor unit filters clogged(coarse and fine cleaning). Dust, wool, hair clog the filters and settle on the heat exchanger. Heat removal from the evaporator deteriorates, and the radiator does not transfer the cold well to the air flow passing through it. In addition, heavy dirt on the indoor unit can impede the rotation of the fan and freeze the evaporator tubes. When the drain hose is clogged, condensation remains in the pan and then flows out of the indoor unit. |
The filters are cleaned after removal. If the evaporator and fan are dirty, the entire indoor unit is disassembled to clean the components. |
from 1900 rub. |
| The air conditioner blows normally after winter, but does not cool well. | There is not enough freon in the air conditioner. Even in a sealed system, up to 7% of the refrigerant can evaporate per year. Therefore, climatic equipment requires annual maintenance (cleaning, refueling). | Refueling with freon is in progress. | from 2RUB 300 |
| There is airflow, but there is little or no cooling. At first, the compressor in the outdoor unit works without stopping, but the air conditioner, nevertheless, does not cool well. Then, the motor stops turning on, and the split system stops cooling. On models with error indications, a low pressure message appears. |
There was a leak of freon from the system. At first, with a small amount of leakage, the air conditioning compressor located in the outdoor unit turns off less and less for rest, despite the weak cooling. Then, as the refrigerant evaporates from the system, the equipment starts blowing warm air at room temperature, and the motor stops and does not turn on. Typically, leakage occurs due to flared joints of inter-block pipes or destruction of assembly seams. |
The technician is looking for a refrigerant leak. Then it seals the leak, evacuates the system (to remove moisture and air) and refills the system with freon. | from 3400 rub. |
| It blows normally, the compressor in the outdoor unit hardly turns off, but the air conditioner does not cool at all or the cooling is weak. It can also freeze the air conditioner tube to the evaporator. |
Capillary line blockage... Due to the clogged capillary tube, the pressure difference at the inlet and outlet of the capillary increases, therefore part of the freon boils and gives off cold even before the evaporator of the air conditioner. As a result, the refrigeration capacity of the split system drops, and the equipment tries to compensate for its lack of constant operation of the compressor. With a complete blockage of the pipeline, the refrigerant does not circulate, the compressor runs idle, the air remains warm. |
Partial blockage is removed by blowing with air under pressure. This operation is also called blockage pushing. Hydraulic cleaning and solvents are used to remove stubborn blockages. In especially difficult cases, when it is impossible to remove the blockage, the capillary tube is desoldered and a new one is soldered. |
from 3900 rub. |
| The split system blows, but does not cool well. The compressor in the outdoor unit shuts down occasionally. | The outdoor unit of the air conditioner is dirty. The heat exchanger has accumulated dust, fluff from plants, plaque from the "exhaust" of vehicles. In addition, the fan becomes dirty and the rotation speed decreases. All these factors worsen the normal heat removal from the condenser; it gives off excess heat to the street air poorly. Due to this, the cooling quality of the split system is reduced. The air conditioner tries to compensate for the lack of cooling by constant operation of the motor in the external block. | The master washes and cleans the radiator. In multi-storey buildings, with difficult access to the external block, it is necessary to additionally order the service of industrial mountaineering. | from 2200 rub. |
| The air conditioner blows hot air when the cooling mode is on (in heated models). |
The four-way changeover valve is defective. It is located in the outdoor unit and is responsible for changing the heating and cooling modes. In the event of a breakdown, the valve "jams" in heating mode. | Valve repair or replacement required. In some cases, if the heating mode is not needed, the valve is simply evaporated, and the equipment always works for cooling. This is usually done to reduce the cost of repairs or in the absence of spare parts (valve). |
from 3500 rub. |
| Blowing with air at room temperature. The compressor is silent or turns off immediately after starting the air conditioner. |
Defective compressor(in the external block) . The main breakdowns are jamming, breakdown of the windings, interturn motor short circuit or open circuit. | Compressor replacement required. In the case of a wedge, repair is sometimes possible (can be wedged). In some cases, it is more expedient to completely replace the external unit with a new one. |
from 4200 rub. |
| Defective starting and / or working capacitor(in the external block). A start capacitor is required for the initial start-up of the compressor motor. Worker - keeps the engine running and increases efficiency. With a loss of the nominal capacitance of the capacitor, discharge, breakdown, the motor may not start or turn off shortly after starting. |
Replacement of a defective capacitor with a new one is required. | from 1300 rub. | |
| Compressor thermostat breakage(in the outdoor unit), which is responsible for the thermal protection of the motor. As a result, the compressor is not powered and will not start. | It is necessary to replace the thermostat with a new one. | from 1500 rub. | |
| It blows cold, but does not cool well. The split system turns on for a short time and turns off quickly when the room temperature is high and the minimum operating temperature. cooling. Modern models give out an error code. |
Defective temperature sensor or thermistor. He "monitors" the temperature in the room and is located in the indoor unit. In the event of a failure, it can "read" underestimated values, which is why the cooling is turned off ahead of time. | It is necessary to replace faulty sensors with new ones. | from 1400 rubles. |
| Defective evaporator or condenser temperature sensors. According to their indicators, the pressure in the system is regulated for different cooling modes. If any of the sensors erroneously signals that the required cooling parameters have already been achieved, then the air conditioner turns off ahead of time, and does not cool the room to the required temperature. | |||
| It blows, but the cooling is weak. The compressor in the outdoor unit can work without stopping and turn off by a thermal relay due to overheating. | The outdoor fan is defective. Most often, the engine burns due to the ingress of dust. This leads to poor heat removal from the condenser and low refrigeration capacity; the air conditioner tries to compensate for its lack by the constant operation of the compressor. This leads to overheating of the motor, and it is turned off by a thermal relay. | A complete replacement of the fan or only its motor is required (if spare parts for the fans are sold separately). | from 1700 rub. |
| When the air conditioner is turned on, it blows warm air. | Lost communication between blocks. As a result, the external one does not work. Without freon circulation, the indoor unit turns into a ventilation device and "drives" the air without cooling. Communication disappears more often in outdated models. Modern ones immediately signal with an error code if the connection fails and will not work. |
Restore the power supply to the external unit (usually wiring, contact connections). | from 1500 rub. |
| The control board in the indoor unit is defective. The reason may be a jammed, punctured or burnt element that starts the compressor or fan of the outdoor unit. For example, power relays, amplifier microcircuits. In addition, the microprocessor can be damaged. | Repair or replacement of the control module is required. The relay can be stripped if the contacts are stuck. Damaged elements are soldered and replaced with new ones. In case of severe damage to the unit, especially due to burnt out microcircuits, failure of the microprocessor, a complete replacement of the control module is required. |
from 1800 rub. | |
| Inverter module defective(in the external block). It is present only in an inverter air conditioner and is responsible for powering the compressor. In the event of a module breakdown, the current is not supplied to the compressor. | It is necessary to replace the faulty module with a new one. | from 2300 rub. |
* The cost is indicated ONLY for the work of the master... Spare parts and additional services are calculated separately and included in the total invoice.
In addition to basic faults, there are others. To determine exactly what kind of breakdown has occurred, the air conditioner is diagnosed. Based on its results, the master determines the volume of repairs and names the full cost of the service.
Did you find that the air conditioner turns on, but does not cool well or does not cool the air in the room at all? Have you tried to troubleshoot a problem but the situation hasn't changed? Contact us for professional help!
Call the "RemBytTech" service center:
The technician will diagnose and repair the air conditioner at home. You choose the day and time of the repair yourself.
After repair we provide a guarantee for spare parts and work performed. The warranty card is valid for up to 2 years (depending on the problem resolved).
Your air conditioner is blowing warm air because when the fan is running, something turns off the cooling mechanism. Causes include simple things like thermostat settings and poor air flow, but there can also be problems that can cause big problems like electrical problems and refrigerant leaks.
We'll start with simple problems you can fix, and when you need professional skills to diagnose and fix a bigger problem.
1.Problems with thermostat
If you're worried about your home or your air conditioner blowing warm air, the first thing to check is the thermostat. It is a fact: they are faked, children accidentally fall into it with a flying object, or a colleague turns it off because it is too cold.
Make sure the thermostat is set to COOL and the fan is set to AUTO. And, of course, the set temperature is lower than the actual air temperature.
2.Dirty filter
Reduced air flow is one of the most common problems that can prevent your air conditioner from cooling. Oddly enough, your air conditioner really needs warm airflow over the coils to function properly. The air conditioner filter is designed to remove dust and dirt from the air passing through the equipment. However, an air filter clogged with dust and debris can completely block air from entering the system. When this happens, the coils are unable to remove the heat. Therefore, the fan of your system simply blows back into your space.
If you haven't had your system for some time and your AC is blowing warm air, the next step is to check the air filter and change it if necessary.
3.Ventilation holes blocked or blocked
Here is another airflow problem that can cause warm air to be blown out of the air conditioner. Is it possible that the ventilation grilles were closed in winter and never opened? Or (this is common in offices!) Maybe you have furniture or other obstacles blocking them?
Make sure all registers and returns are open and allow air to flow freely.
4.Disconnected or leaking ducts
It is also possible that you have airflow problems that you cannot see ... in your ducts. If the duct has holes, cracks, or is completely disconnected, air may not reach the device. Or, the chilled supply air can be wasted in your walls, in the attic or downstairs, and as a result, the air conditioner blows out warm air.
If channels are available, you can take a look at them. Damage often occurs during construction projects, or from being hit by birds or rodents. On a second glance ... this might be an area where you'd better get professional help to check the condition of your airway.
5. Power loss for outdoor unit
Many air conditioning systems have an internal evaporator / air cleaner and an external condensing unit. If the air cleaner is working properly, the fan will still blow air into your space. But without the operation of the condensing unit, there will be no cooling; therefore, your air conditioner is blowing warm air.
This scenario can happen when your capacitor bank loses power, often due to a blown fuse or a tripped circuit breaker.
IMPORTANT Never try to diagnose electrical problems yourself unless you are a qualified electrician or HVAC technician. However, there is one thing you can check: your emergency switch. It is possible that it was accidentally turned off when the condenser unit was turned off and this could also lead to blowing out warm air.
6 dirty condenser coils
One of the important functions of your condensing unit is to generate heat outside your room. The condenser coil is responsible for this job. As it is exposed to the elements, it can be loaded with dirt and dust, not to mention leaves and debris. Eventually this prevents the coils from working and your system cannot cool effectively, so the air conditioner blows warm air.
7.Leak of refrigerant
Refrigerant (Freon) is a substance that flows through your air conditioning system and causes refrigeration. It is a closed loop so you do not need to add refrigerant if there is a leak in your refrigerant line or coil. When this happens, your system loses both refrigerant charge and cooling capacity. Depending on the size of the leak, cooling losses may occur slowly or immediately, but your air conditioner will end up blowing warm air.