how to repair a central air conditioning unit

how to repair a central air conditioning unit?

Central air conditioners have two different components: the condenser and the evaporator. The condenser is usually located outside the house on a concrete slab. The evaporator coil is mounted in the plenum or main duct joint above the furnace.

how to repair a central air conditioning unit

Most central AAs are connected to the home’s forced-air distribution system. Therefore, the same motor, fan, and ducts used for heating are used to distribute cool air from the air conditioning system. When a central air conditioner is working, the hot air inside the house flows into the oven through the return air duct. The hot air travels by the fan through the evaporator coil which is cooled in the plenum and is then delivered through ducts to cool the house. When the AA does not cool, the problem will probably be in the distribution system.

The core AAs are made up of the condenser unit, on a concrete slab, and the evaporator coil. Both the evaporator and the condenser are sealed. Therefore, an authorized technician should be called in for almost any other maintenance besides routine cleaning. Central AAs should be professionally inspected and adjusted prior to the start of each refrigeration season. However, don’t let your maintenance run out with this annual checkup.

Before starting work, we will try to limit the scope of work. Look for the problem you are having and find a suitable solution.

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If the capacitor does not turn on it is possible that the cause is the lack of power, to solve it check for blown fuses or if they have blown, check the circuit breakers at the main entrance, the panel of a separate input or the restoration circuit. Another common problem can be a too high thermostat, to fix it you can lower the thermostat setting by 5 °. If the problem is a faulty motor, you should call a professional. If the compressor is faulty, you should also call a professional.


If your problem with the AA is uneven cooling, the cause may be an unbalanced distribution of the system, to solve this you must balance the balance system. Insufficient cooling may be because you have set the thermostat too high, to solve it you can lower the setting by 5 degrees with the thermostat. Another cause of insufficient cooling can be a dirty evaporator and the solution is to clean it. A unit that is too small can also cause this type of problem, to solve it you can replace it with a larger unit.


If the unit does not work, lower the thermostat setting by at least 5º. It may not work because of a dirty condenser. You should also clean the condenser coil and fins if necessary straighten the fins as they can sometimes bend slightly.


If it is the condenser unit that is dirty, you will need to remove the debris that is blocking it, usually weeds, grass, and vines. Check the evaporator, if it’s dirty, you need to clean it. If the problem is due to a faulty compressor or there is not enough refrigerant in the system, the only viable solution is to call in a professional.

If the condensing unit turns on and off repeatedly it may be due to a dirty condenser, if so, you will need to clean the condenser and the fins. The condensing unit may be blocked. Also check the condenser coil, if it is dirty, clean it. Remove debris blocking condenser, cut weeds, grass, and vines. Before closing your AA, check the evaporator, as it may be dirty, if so, clean it carefully.

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