Outdoor unit fan rotates slowly

The split-system is cooling bad: the reasons and how to struggle with it

Split-system is a well-established name of domestic conditioners which have a detached construction, i.e. consist of two blocks. inside and outside. Improvement of systems and wide availability of such class of techniques made split-systems an indispensable attribute of a city apartment, especially in southern regions.

Unfortunately, as the result of some malfunctions air conditioner can stop performing its main function. cooling of air in the premise. Not being a specialist it is rather difficult to define the reason of a breakage. Nevertheless, most cases of refrigeration failure or dropping of its productivity were more than once met in practice of masters and they are typical.


External unit installed in a hard-to-reach location, cannot receive regular service. The outdoor unit is most exposed to rain, snow, dust, debris and dirt. It is also worth noting that the outdoor unit fan is responsible for the cooling and normal operation of the entire air conditioner.

The main reasons of breakage of the fan of the outdoor unit:

  • Dirt on the blades, which prevents the normal rotation of the blades and imbalance occurs
  • Foreign objects that slow down the operation of the blades
  • Damage to the casing and fan itself
  • power fluctuation
  • Poor-quality elements or low quantity of grease of nodes
  • Poor installation of the external unit, which has led to improper operation of the system
  • defect in a fan
  • Operation of the unit in low temperatures

To understand that your climate control device, namely the fan is out of order, it is enough to hear a strange noise, vibration and other elements. Some types of models are able to detect a malfunction during operation, while also being able to signal a breakdown to the owner of the device. If you do not replace the breakage in time, you can face an expensive device.

Diagnose the outdoor and indoor units

Causes of problems with the indoor unit fan can be found by yourself.

If ventilation does not work, it is necessary to:

outdoor, unit, rotates, slowly
  • Check the voltage in the utility power supply:
  • Check the operation of the contactor that switches the voltage from the fan to the compressor;
  • Inspect the capacitors, with an insulated screwdriver, short the capacitor terminals;
  • Inspect the impeller, check for damage to the blades;
  • test the electric motor windings to detect looseness or bearing jamming.

To check the indoor air conditioning unit that is installed in the room, it is not necessary to dismantle it. To diagnose it is only necessary to remove the cover, which is fastened with screws or plastic clips. problems with diagnosing the remote compressor. To check the case must be dismantled from the wall, work with it in the room. To check the voltage parameters use voltmeters, multimeters.

Cooling circuit

Probably the only emergency situation in the cooling circuit is a leakage of refrigerant.

It is almost impossible to provide full tightness of circuit, because all elements of system are connected by metal pipelines. Leakages occur at connections where there is a risk of friction and leakage.н. “Normal” freon leakage, due to which conditioner loses about 8% of coolant during a year. This situation is not a problem and requires only periodic topping up the system with freon during regular maintenance.

At a low-quality installation, destruction of sealing and assembly parts (for example, at appearance of a crack in the nut fixing a branch pipe), corrosion of mains there are additional places of a leakage. Freon consumption exceeds standard indexes, conditioner loses productivity and speed of temperature rise, freezing of details and so on can appear.д.

It is difficult for the end user to diagnose the refrigerant leak unambiguously:

  • He doesn’t have the necessary equipment to estimate the amount of freon remaining in the system. The indicators by which he can judge the condition of the circuit. the temperature of the pipes and radiators, the pressure in the system. However, these measurements, too, require special instruments. at a minimum, the thermometers and the gauge assembly (manifold) attached to the surface and skills in handling them.
  • In some cases it is possible to judge about the place of leakage by oil leakages and dust buildup, but this method cannot be considered reliable and working in all cases.

Various methods are used for this purpose:

  • Immersion in water;
  • Using soapy solution;
  • The use of ultraviolet dyes and lamps;
  • Working with leak detectors of different designs.

The following procedure is used to repair a refrigerant leak:

    Unplugging the split system.

  • Carry out a visual inspection of the pipelines, paying special attention to the joints, the quality of rolling and the integrity of the fittings.
  • If necessary, the search of depressurization is performed (removal of freon from the system, its pumping in with nitrogen may be required).
  • Leaks are liquidated by detail replacement, soldering of problem places, cutting of branches in joints with repeated rolling over. The works are performed on the system without any refrigerant.
  • Pressurize the circuit.
  • Perform vacuuming.
  • Charging the system with freon.

If you have necessary equipment you can do all the works by yourself. But in the service center repair will be made faster and of higher quality.

All necessary materials can be purchased at the same service center. They also provide the equipment (vacuum stations, pressure gauge manifolds, etc.) for rent.) for hire.

Operation of automobile conditioner

The air conditioner in the car is an option, which adds extra load to the engine and increases the demands on its cooling system. This is especially noticeable when the car engine is idling, for example, when the car is in traffic. In fact the additional load promotes creation of a tense thermal mode at which the slightest failure in operation of cooling system can cause overheating of the engine. Therefore experts recommend to switch off a conditioner from time to time. it is better to suffer heat in a saloon than to allow boiling of coolant and overheating of the engine.

Before the beginning of a summer season it is desirable to clean the condenser of a car air conditioner from contamination. For this purpose it is necessary to disconnect it from the car radiator and then moisten hardened impurities available on it with car shampoo. After 15-20 minutes thoroughly wash off dirt by mild jet of water which is supplied from the distance of not less than 1 m.

Tip! Before installation of the condenser it is desirable to check and, if necessary, to align its crumpled plates. It is possible to do it with the help of a wooden stick or a toothpick.

Summarizing the above, we should once again emphasize that the climate control equipment. it is engineering complex and delicate device, independently repairing which is strongly not recommended. If the system has stopped cooling the air, the user can check whether this circumstance is normal and in case of a negative result call a professional technician. But self-cleaning of the filter of the inside of the conditioner is also possible, but this procedure should be performed once in two weeks during the whole season of active use of the conditioner, but not waiting until the last breakdown.

What to do if conditioner does not blow with cold air

Some malfunctions of air conditioner, which have a negative influence on cooling, can be eliminated at home. Others demand to apply to the specialists, because unskilled repair often worsens the problem.

The fan of the indoor unit is defective

If conditioner does not cool as before, but still continues to carry out its direct function, in most cases it is a problem with the fan. Most likely, it rotates very slowly or stands completely. As a result the cold air stays near the radiator and almost does not get into the room.

The breakage can be caused by contamination of the cooler, the wear of the bearing or the burnout of the motor. To restore cooling, diagnosis and repair is carried out according to this algorithm:

outdoor, unit, rotates, slowly
  • Remove the front panel of the air conditioner to get access to the cooler.
  • Remove the fan with a Phillips screwdriver and clean it from dust and dirt.
  • Install the cooler in place and conduct a test run of the air conditioner.

If the problem was caused by heavy fouling, after cleaning the split-system will start working on air cooling again. If manipulation does not help, you need to scroll the blades with your fingers. Abnormal sounds from the place of connection with the motor or rotation with force indicate wear of the bearing. If a fan rotates normally, but does not start during installation in the place, the reason of a breakdown is in a burned out motor.

In the latter two cases, you must buy exactly the same cooler and install it to replace the broken one to restore cooling. The repair is very simple and does not require a call to the service center.

The less often air conditioner is cleaned, the faster the fan can break down

Low voltage in the network

If conditioner is working, but does not cool the air, the reason is probably the low voltage. Compressor of a split-system consumes much energy and at the values lower than 200 V it simply will not start. At the same time indoor unit is still able to work as a usual fan.

You can solve the problem in the following way:

  • Disconnect the split-system from a power supply.
  • To wait till the voltage rises up to at least 200 V.
  • To start the air conditioner back, because at the network deviations within 10% the compressor is able to work for cooling.

How to Fix Desktop Power Supply Fan very slow spinning.

If power jumps happen too often you should install a stabilizer or voltage relay. They equalize the current values and cooling is restored.

Freon leakage

If the air conditioner blows warm air, the cause is often a refrigerant leak. Freon slowly evaporates through microscopic holes in the tubes and connections. The compressor overheats, trying to provide the right pressure in the system, but the indoor unit still releases only warm air.

If the conditioner hisses and does not cool, it is necessary to address in the service center for refueling. The specialists will not only restore the freon volumes in the system but also will check the pipes for tightness and if necessary they will braze the gaps.

outdoor, unit, rotates, slowly

The mode switching valve is broken

In some cases conditioner is heating but it is not cooling, though it does not show any error on the display. The reason is usually the breakage of special four-way valve, which is responsible for switching between the modes. If it fails the split-system ceases to keep cooling and can blow only with hot air.

Replacing a four-way valve is very expensive because it requires complicated work in hard-to-reach places. It is easier to remove the element completely and refuse the heating function, keeping only the cooling mode.

Clogged filters

Fine and coarse filters in the indoor unit can clog due to the settling of dust, hair and other small debris. As a result, the radiator begins to emit less cooled air. Contaminants not only accumulate on the filters and heat exchanger, but also cause the drain hose to clog and the evaporator tubes to freeze.

AC Not Working. Condenser Fan Running Half Speed.

Very easy to clean. To do this:

  • Remove the front cover of the indoor unit.
  • Remove the filters, which are attached in special slides or held in place by latches.
  • Rinse the mesh plates in cold water.
  • Dry out moisture naturally.

Clean filters are installed back in the conditioner and start it in a cooling mode.

Filters of split-system cannot be washed with hot water as it causes deformation of plates

Clogging of outdoor unit

Air conditioner’s front unit is permanently exposed to aggressive environment. Over time leaves, poplar down and dust, bird feathers and small branches accumulate on its radiator. All this brings the heat exchanger productivity decrease, complicates the fan rotation and leads to compressor overheating. As a result the conditioner does not cool much or stops supplying cool air completely.

  • Completely disconnect the split system from the power supply.
  • Open the case of outdoor unit.
  • Remove basic dirt with a soft brush or vacuum cleaner.
  • Remove the dust from the radiator with a sprayer or a steam-jet.
  • Wait until the unit is completely dry from the inside and put the cover back on.

It is recommended to use conditioner again for cooling not earlier than in one day.

Attention ! If the external unit is located at a great height, it is better to entrust the cleaning to specialists.

Capillary tube clogged

Sometimes a filled air conditioner does not cool air because of capillary tube clogging. Blowing out remains normal, but compressor hardly ever comes on. That is why air only comes into the room with a warm air.

Small blockage obstructing cooling can be removed by blowing out the tube under pressure. If too much dirt has accumulated in the capillary, it is necessary to flush the system with a thin stream of water at a strong pressure. In some cases it is necessary to call a professional to remove and solder the tube and replace it completely.

The machine makes a lot of noise

As unit propeller, which main task. to create air flow, is made from plastic (not always qualitative), so there is a great probability to deform the latter. Usually it happens if the unit is left for a long time under direct sunbeams or near source of high temperature. The deformation disturbs the equilibrium between the blades, which causes strong vibrations and noise in a normal airflow.

Shaft vibration can also occur because the sleeve of the friction bearing may be loosened by prolonged use.

Often, when dropping the unit, when the blades rotate, the protective grid is deformed. If a rotating propeller hits it, one of the blades can break.

To summarize, it can be said that in different models of fans the main nodes and control elements may look different. But the principles of diagnosis and troubleshooting do not change.

1) Good day to all.Came across such a problem cooling fan began to spin slowly.What can be the reason.Checked the ground is good, the sensor is new, the fuses are normal.VAZ 2110 carb. Question by: Nikolai Maltsev Separate Subject: 2) Urgent: When you turn the ignition on the VAZ 2106 blows the fuse charging. What can be the question from: Alexander Sergienko Separate subject: Write the number of the question which you answer! The authors of the questions: Be sure to leave in the Комментарии и мнения владельцев how you solved your problem!Why the fan started spinning slowly.

7 Owners Комментарии и мнения владельцев and opinions on ” Why the fan is spinning slowly. I have had this problem with the cooling fan spinning slowly

2) all of a sudden? Or maybe you did something, changed the battery, etc.п?

2, short circuit. I have had this happen several times because of the wire to the reverse sensor on the clutch, on a five-speed it is located near the exhaust, and when the wire burns to the pipe, for some reason this fuse blows. Go there, or see an electrician

Check the polarity, maybe it is spinning in the wrong direction.

1 we need to look at the incoming voltage. If normal, there are 2 possibilities. Sleeve bearing is dead or there is an inter-twist in the motor winding.

Good evening, can anyone tell me the reason. the fan slowly rotates. I unplug the wire from the fan trigger works fine.

The usual floor fan, three speeds.

The fan doesn’t seem to be blowing much, what is the reason and what to do in this situation?

There are many reasons, it could be a design feature, or rather the floor fan blades.

There are budget models that are originally weak blowing, the air flow is “chased” in a circle, and not thrown outward, this is due to the configuration of the blades (or deformed blades), then there is nothing you can do.

To change the shape of the blades, or change the number of blades is not possible simply buy a new fan and immediately in the store to check how effectively it blows.

Although of course you can replace just the impeller, but it is extremely difficult to find a spare part for a particular model of fan.

Maybe the fan blades and the guard are covered with dust, you need to dismantle the guard and vacuum it.

The blades are also cleaned from dust, it is even better to wash the blades with any non-abrasive detergent for dishes, all work is done with the fan off, that is, take out the plug from the socket.

Floor fans (blades) have several speeds, perhaps one of them failed and you can not increase the number of fan speeds.

Perhaps the room is too hot, the fan is working fine, but you do not feel the flow of cool air.

The only disadvantage is that you have to change the ice in the bottle often, it melts quickly in the heat.

Probably a long time haven’t lubricated the fan, here enough to remove the protective cover and drop a couple of drops of oil on the shaft on which the blades (impeller) are fixed, I lubricate this

At breakage of domestic fan, both desktop and floor, do not hurry to take it in repair, and the more so to throw it away. Most likely, there was a simple problem, and you can repair the fan yourself.

How to Repair a Household Fan

If a household fan breakage, both desktop and floor, do not rush to take it to repair, and even more so to throw away. Most likely, a simple problem occurred, and the repair of the fan you can make yourself.

Basic malfunctions

Household fan is not complicated in design, and the principle of its device can be seen in the figure below.

If you look closely at the figure, it becomes clear that failure in the machine can cause damage to the motor, gearbox, crank, speed switch and propeller that creates the air flow.

The main difference between the desktop cooler and the floor cooler is the high stand in the floor version. Otherwise, the designs are identical.

So, the main malfunctions that you can observe in the cooler you purchased:

  • The unit does not turn on, the mains light does not light up;
  • the machine does not work, but the light is on;
  • the cooler blades do not rotate properly;
  • the unit does not turn to the sides;
  • The cooler makes a humming noise and does not rotate.

The unit will not turn on

In this situation, there may be two possibilities: the lamp, which indicates the readiness of the machine to work, may light up or not. Depending on this, the algorithm for diagnosing the breakdown will differ.

The light does not turn on

If, after plugging the machine into the socket, the light located on its body does not light up and it does not start, the first thing to do is to check whether there is voltage in the socket. It is done simply: take any electrical appliance and plug it into this socket. If the unit works, then you need to look for a fault in the electrical plug and cord.

To check the plug, unscrew it and check the reliability of the connection of the wires to the terminals. To check the cable, you need to disconnect it from the terminal block of the device and “probe” with a tester. If you find a break in the cores of the cable, it should be replaced.

The light bulb is on

The cause of such behavior of the unit, when the indicator light is on, but the fan does not work and no sound is heard, can be caused by a breakdown of the unit with buttons. To check the buttons, you will need to disassemble the button assembly located on the floor fan stand or the tabletop unit stand. But, before you disassemble the machine, make sure that it is unplugged from the socket.

The operation of the buttons is very simple: there is an “on” and “off” position. Using a tester, check the “output” and “input” on each key.

If a faulty button is found, it cannot be repaired. Therefore, the switch should be replaced or the connection should be made directly. This approach to solving the problem will help to run the unit if you are far from the store, for example, in the country.

Faulty speed switches can also be the reason why the fan does not turn on. To check the regulator, you will need to put it in the maximum position and check the “input” and “output” with the same tester.

The fan blades do not rotate properly

In the case when the fan does not pull and poor air flow, you need to disassemble the housing in which the motor. Sometimes the fact that the propeller does not spin may signal insufficient lubrication in the slide bearing installed in the electric motor.

To disassemble the fan proceed as follows.

  • Grid guard must be unscrewed (front of guard) and removed first.
  • After the grid, disconnect the propeller. It can be screwed to the motor shaft with a nut with a left-hand thread. That is, to unscrew the nut, turn it clockwise, and to tighten it, turn it counterclockwise.
  • Remove the rear guard by unscrewing another nut.
  • Unscrew all fasteners that hold the unit shroud in place. Sometimes in the handle to adjust the rotation of the body is another bolt. If it is not unscrewed, you can not remove the motor housing.
  • Now, with the motor open, you should drop a few drops of machine oil (best to use spindle oil) on the hub (indicated by the red arrow) and turn the shaft several times in different directions so that the grease is absorbed inside.
  • After this procedure, slight rotation of the shaft will resume. Reassemble the motor housing in reverse order.
  • Turn the unit on and check the airflow.

Fan does not turn to the sides

How to fix a floor fan if it stops spinning (turning) on both sides? It’s the crank, the screws fixing it can be loose or unscrewed. You will need to disassemble the motor housing to find out. If the turning of the body occurs with a delay or a complete stop when the machine is running, then you should check the gears in the gearbox for engagement. You also need to check the gear switch itself, specifically the movement of it up and down.

Disassemble the gearbox and remove the main gear. The shaft will also have to be pulled. Lubricate all moving parts and reassemble the gearbox. If the gears are badly worn, they need to be replaced, although it is difficult to find analogues of broken parts for the fan. In that case, you will have to assemble the unit without the gearbox and use the cooler in the normal mode, when the air masses will move in the same direction.

Cooler makes a humming noise and does not spin

Cases where the fan does not spin, and at the same time the motor hums, are quite common. There can be several reasons for this failure:

Capacitor failure

Repair of floor fan in this case comes to checking the capacitor capacity with the help of a tester. To get to the radio part you need to disassemble the motor housing. A detailed description of how to disassemble the housing has been given above. After removing the casing, you will see the capacitor attached to the motor.

The capacitor capacity of the device shown is 0.85 microfarads. For this reason, it is necessary to set the value from 2 microfarads to 200 nanofarads on the device, as shown in the figure below.

In this case, after connecting the capacitor to the instrument you can see that its capacitance is 0.841 microfarads. Considering an error of ± 5%, the capacitance of the radio component is within normal limits and is not the reason why the cooler has stopped working.


The next likely problem is the contactor. This is the part with which the voltage is supplied to the indoor unit and distributed between the motor and the compressor. There should be 220 volts on one side of the contactor as well as on the other side. If the output of the contactor is 0 volts, then the contactor is faulty. You can check this with a multimeter.

Be careful! When checking, use all protective measures when working with electrical circuits. If you are not sure about something. call a master.

After all checks it is possible to say with confidence that the whole problem is in the fan. If all other parts work properly, it is necessary to replace this part. It is better to entrust such procedure to professionals, who are able to do everything qualitatively and with warranty.

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