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The fan is working but the air conditioner unit is not working

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Lets take a moment to see what exactly is inside the condenser (that's an outside unit) You have a compressor, a fan, a contactor, a coil, and a capacitor. How does it work? The condenser is connected to the house via an electrical box called a yank out. It is a quick way to kill power to the unit. Note: this is not the breaker to the unit. That would be in the main panel by the meter. People always assume this is the only safety. It is put there by law to kill the power to the unit for service personel. Pull out the connection to kill the power before checking the unit. The first thing to look for is a swolen capacitor the fan is working but the air conditioner unit is - failed%20cap.jpg. If it swells it fails and the unit don't function too well. The next thing to look for is contactor problems. Their are small wires coming from the inside control panel that power up the 24 volt coil that yanks down the contactor. That coil might be bad. If it has no continuity(open) it is in need of replacement. A critter could get between the contacts and fry them as well. Look on the compressor for burnt wires and loose connections (very common). The fan motor should be very easy to turn so if it is stiff then it probably is in need of lubrication. The standard oil in the HVAC world is Zoomoil. It is hi temp resistant, will not lose viscosity and is non flammable. If a weed eater should kill the thermstat wires going outside noting will work because the contactor won't pull down. if the contactor coil is open then it won't pull down and engage the compressor and fan. if a critter crawled under the contacts nothing will happen. of course if the compressor pins are shorted to the copper piping or there is a hole in it or it has an open winding between pins it is shot.

Posted on Jul 01, 2009

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Since the failure of an air conditioner to turn on, loss of air conditioner cooling capacity, reduced air conditioning output temperatures, loss of cool air supply, or even loss of air flow entirely can be due to a variety of problems with one or more components of an air conditioner or air conditioning system, after reviewing the lost air conditioner cooling diagnosis procedures described in this article, be sure to also review the diagnostic procedures at each of the individual air conditioning diagnosis and repair major topics listed just below. To return to our air conditioning and refrigeration home page go to AIR CONDITIONING & HEAT PUMP SYSTEMS.

Electrical problems on HVAC systems: Keep in mind that despite the depth of technical detail you will find here about all components of air conditioners and heat pumps, most service calls for non-working air conditioners or heat pumps turn up an electrical problem. So if your A/C system is just not working at all be sure to check all of our electrical and control setting suggestions first.

Mechanical problems on HVAC systems: tend to fall into these groups: refrigerant leaks, dirty condenser coil or unit, dirty evaporator or cooling coil, or burned out (or hard-starting) compressor motors. We have also seen a number of problems with fans and fan motors in both the compressor/condenser unit and in the air handler/blower fan unit. Some of those fan problems are mechanical - like a loose fan belt or blade. MORE DETAILS

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1 Answer

Is the fan on the outside unit supposed to turn when the heat is on or only for the air conditioner? Our unit is omitting a strange odor and the fan will not move even if we switch the unit to air...


The outside fan is used when ever the compresser needs to be cooled. So depending upon the outside temp as well as the temp of the refrigeration, it may not come on. When you say "our unit is ommiting a strange odor" are you refering to the outside condenser? or from the air handler? and what does it smell like? Please give us more to work with to be able to help you. Yes there are people looking and working on problems here at Fixya.com.

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Hi,
It could be either one or both...usually I like to do both at once because either one can cause the other to fail...that problem is a common one for air conditioning units...

Here is a tip about troubleshooting your air conditioner...
There are many things that can cause your air conditioner not to cool…

Air Conditioner Trouble -Review the Possibilities
http://www.fixya.com/support/r3571569-air_conditioner_trouble_review_the_possi

heatman101

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