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My AC condensing unit does not turn on, but the air handling unit is on. What can be the problem?

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Hello,

Do you hear the compressor running? If the compressor runs but the fan does not turn then that tells me the contactor is pulling in. Therefore, the fan should be turning. 99% of the time it is a burned out motor. Do not bother with the capacitor suggestions, it will be a waste of your time. Take out the motor, go to ACR or Johnson Supply, or Baker distributing, and get a matching replacement. Always get a new capacitor with the new motor. They are only 3 dollars and good insurance for the new motor. You will probably spend a total of 65 dollars. Get it done.
ps: if the compressor does not come on either then the problem is a bad contactor or thermostat or broken 24 volt control wire to the contactor. If the freon pressure is too low because of a loss of freon then a pressure switch could be keeping the contactor locked out. In the event of no compressor and no fan running, do not start off with the fan repair. Start off with the contactor and make sure it has 24 volts on the coil and that it pulls in.

Take care.

Posted on Aug 05, 2010

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Why does my ac not blow cold air?


You have to try resetting the system. First turn the breaker off for the condenser and wait about 20 seconds After you turn it back on the system should reset. If you need any other assistance check us out online at Boca AC Service we are always happy to lend a helping hand

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Replacing a condenser fan in centralized A/C


On of the common problem with centralized A/C unit is a bad condenser fan. I have known people who called an ac technician to fix their ac because of a bad condenser fan and suggested replacing the whole unit! Costing them a lot of money when all it needed was a 50 dollars condenser fan! If the condenser fan do not run or it runs only when you give it a push, it'sbad. You will also notice that it is vey hot. When replacing a condenser fan you may want to replace the starting capacitor too. Replacing a condenser fan is not very hard, just make sure that the power to the ac unit is turned off at the breaker box. Confirm that the wires are not live by using a meter or an ac tester. The fan motor are held with brakets sometimes just screws. Most fan you can buy that has reversible rotation by just reversing the plug. Make sure it is blowing upwards. If not reverse the rotation. So if you notice that the unit is not putting out cold enough air and you went outside and noticed the compressor running but not the fan, turn off the AC right away and do not use it untill the fan is replaced. Running the unit with a defective fan can damage the compressor caused by overheating.

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Why does the aircon cant stay on


Most modern air conditioners are designed to offer up to 10 to 20 years of reliable use. However, even the most reliable of air conditioners may stop cooling or suffer from problems from time to time. Remember that one of the best ways to prevent unexpected A/C problems is to have regular maintenance performed on your unit. If you cannot perform the maintenance yourself, hire a professional to do so. Spending money on maintenance now can save you from big repair bills in the future.
Some of the most common AC problems are listed below, and they may even be the reason why your air conditioning unit won't kick on. Review this information so that you know how to best troubleshoot problems with your unit. Be sure to determine whether your unit has shut down entirely or whether only a part of your unit has shut down or isn't working. Remember that it is always necessary to cut power off to your unit before inspecting it for wiring-related problems.
  • The AC unit does not cool rooms evenly: Inspect your unit's distribution channels. Make sure that the fan on your unit is kicking air into rooms or into your duct system.
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  • The condenser unit returns on and off repeatedly: Having a unit turn on and off repeatedly is extremely frustrating. In general, this problem is caused either by a dirty condenser and fan or a clogged condenser.
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Usually the cause of this 'short' will be - either the condenser motor in the condensing unit (outside unit) or the compressor - also in the condensing unit.

If you're mechanically inclined - and "very careful" around electricity - there is a fairly simple way to find out which component is causing the short.

Step 1 - Make sure the condensing unit (outside unit) is completely disconnected (electrically) , i.e. pull the fuses/turn off circuit breaker on outside unit and turn off thermostat.

Step 2 - disconnect the condenser motor (this is the outside fan motor). Note: when you disconnect the wires of the condenser motor "be sure" you mark/write their location, and wrap them in electric tape.

Step 3 - start the AC unit. If the breaker trips again you can pretty much rest assured it's the compressor that is shorted.

To prove it (without a doubt) - go to next step.

Step 4 - "be sure circuit breaker and thermostat is turned off" - and - 'reconnect' the condenser motor - and - then disconnect the compressor wires (mark wires and tape them).

Step 5 - Start AC.

If breaker doesn't trip - you know it's the compressor that is shorted.

If breaker 'does' trip again - then it's possible the breaker itself is bad (not likely) or there is a 'short' in the condensing unit's "wiring" somewhere (not likely).

My guess is that either the condenser motor or compressor is shorted.

Hope this helps.

Good Luck!

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