Central air conditioning problems
Read and Write Your Air Conditioner Problems

Central air conditioning problems

This is lists of common central air conditioner problems; we will come across as we enjoy the comfort environment it produces.

This is for information only, it’s not meant to fix central air conditioner units. This is not written by boy genius Dexter to foresee every detail. Now we’re done with that. Let’s get start.

Central air conditioning problems mainly fall into four situations:

  • Electrical problems
  • Mechanical problems
  • Refrigerant cycle problem
  • Air flow problem

All HVAC problems seem to be connective. If we have air flow problem, it will affect the refrigerate cycle and Ac components.

For example, homeowners will call us and said he needs an Ac Freon. We will always ask him basic question, like. Did you change the filter? Usually, it’s not the Freon, it’s the ac filters. He doesn’t know that air flow will affect the refrigerant.

Our central air conditioner units will have problem as it ages. Here is the opportunity to submit our central air conditioning problems.

The lists below are just the tip of the iceberg. So, if we want to read more; we have to provide the air conditioner problems.

Submission Guidelines:

First search the links below for specific info. If the info is not below, Provide DETAIL info to the problem and not every question will be answer (nothing personal)

  • No DIY or FIY Question


Most homeowner doesn’t understand how air conditioner works and they’ll provide us the wrong information. We’re answering their question basis on that information.

So don’t follow anything you read in this page! We’re not responsible for any information you’re putting into action.

Write our Central Air Conditioning Problems


Read Air Conditioner Problems

The links above is for central air conditioner problems only, if we have a general question. Here is the link:

Central air conditioning unit question

Central Ac Unit Is Running, And The Condenser Wouldn’t Turn-Off

We turn the ac thermostat to off position, but the condenser unit still running. The above component is continuing running. The problem could be:

HVAC contacto

There is power supply to the condenser units. A switch that supposed to be in the Normally – Open position is actually in the Normally – Close position.

There is Frost Buildup On The Suction Line (big copper line) Or Near The Compressor

We’re getting cold air, but the central air condition kept cycling On and Off. Our central ac units cycle On and Off due to low pressure. The problem could be we have dirty filters and the evaporator coils or the Ac Freon is low.

HVAC condenser ic

Central Air Conditioning Units Not Blowing Cold Air

If the central ac unit is blowing air and it is not cold. The possible central air conditioning problems could be:

  1. The condenser unit is not running, including the compressors.
  2. Refrigerant leaks or not enough refrigerant.
  3. Dirty condenser coils and the evaporator coils.
  4. There could be something wrong with the metering device.

The Condenser Fan Is Running, But The Compressor Doesn’t

We know the compressor is not short to ground. If it is short, the condenser fan shouldn’t run. Here are the possible problems:

This is not running:

Sealed Hermetic compresso

  1. Some air conditioner compressor has hard-start system that could be the problem.
  2. Bad electrical connect to the compressor.
  3. Internal safety switch within the compressor is open.
  4. The compressor is lock up due to foreign object or liquid refrigerant.
  5. Bad capacitor.

Central Air Conditioner unit Is Running, But Not Enough Air

The outdoor units and the indoor units are running, but we’re not receiving enough air from the Ac units. The air is cold, but not enough to cool the house down.

The main device that supposed to move the air within the house is the indoor blower. The symptoms could be:

  1. The blower’s blade is dirty.
  2. Blockage within the duct.
  3. Duct leaks.
  4. Blower’s capacitor is damage.
  5. Blower’s motor is bad.
  6. Blower is on low speed.
  7. Dirty filters.

The Central Air Condition Is Making Noise

If the central air conditioner unit is making sound and the sound is from indoor. The only electrical part that is large enough to make that sound is the blower motor.

The sound could be from the blade or foreign object is trap in the blowers.

The Indoor Blower Is Running For A Short Time, Then It Stops.

If the indoor blower motor is cycling on and off, the problem could be the capacitor is bad. The internal thermal overload is causing the motor to do that.

The Condensing Unit Is Not Running.

If the central air conditioning units is not running and the condensing unit breaker tripped.

We could try resetting (1 time) the breaker and it trips again.

The problem could be the condenser fan, compressor and other electrical is grounded.

The Central Air Conditioner Unit Is Running Constantly.

If the central air conditioner unit is running and never stop. The possible central air conditioning problems could be:

  1. The ac filter, evaporator, condenser coil is dirty.
  2. Low on Ac Freon.

One Room Is Warmer Than The Other.

If we have one bedroom is warmer than the other bedroom. The possible problem could be:

  1. We had a lot of electronic device that is producing heat on that specific room.
  2. Ducts Leak.
  3. The grille is closes.
  4. Object is blocking the air flow.
  5. Restriction within the duct.

These are the common central air conditioning problems homeowners might see within their central air units. These are just random air conditioner problems; nothing special.

How do we avoid some of the air conditioner problem?

We can change the filter; clean the ac evaporator and the condensing coils to avoid unnecessary air conditioner problems. It’ll take extra pages to example why. But, it does help.

What Other Visitors Have Said

Click below to see central air conditioning problems from other visitors...

Air Handler Blower Fan 
April 12, 2011 Getting power to central air conditioning unit outside, nothing comes on. i pushed in on the contactors and everything comes on except …

Air Handler Fan Relay  
April 5, 2011 I have a 3 ton air handler in my attic. The fan relay chatters and the motor inside the air handler turns very slowly, and at the same …

Fan blows, outside unit clicks, but doesn't turn on -- only at night?! 
March 30, 2011 At the duplex we are renting, the technician has been out to service our central air conditioner unit multiple times. He has recently …

Outside Unit Runs , Indoor Blower Sometimes Does 
March 25, 2011 Ok, I have a Lennox central heat and air system in a house I just moved into. When I put the air conditioner mode on the outside …

Buzz Noise Outside Motor 
March 24, 2011 03/23 *if any way Possible need reply "a.s.a.p." , it's starting to get HOT here in Alexandria , La.71302* We had this …

The compressor runs but the fan does not 
March 12, 2011 Descripton - 5 ton 12 seer d.p.p. g/e Model number DAYH-F060N110 Serial Number NALM010365 Problem: When the unit is turned on, …

blower fan runs constantly 
February 22, 2011 Thermostat switch is set to off. Fan switch is set to auto. I removed the thermostat and it still runs.

Blower Fan Doesn't Run 
Central air conditioner compressor and fan outside starts and runs but the inside Fan (Squirrel Fan) doesn't run, the only way is if I open the cover and …

No heat, no ac, no fan, no noise 
It's not working at all. We've tried readying the breakers, waiting, and it's too cold to do anything else. We've switched the thermostat on and off, onto …

Carrier central air conditioner shuts down all the time after only a short time 
Room temp taken 26 cels air con on auto runs 1 hour sometimes less shits down and turns right off I have o climb up to the main switch to turn it off them …

Central air blows hot to reach desired temp. then blows cold instead of turning off. 
I set my central ac system to heat up to a certain temperature but instead of it turning off once it reaches the desired temperature it starts blowing …

Blower Motor Goes Off And On 
My A/C unit works hard here in Phoenix AZ. The compressor starts up and the blower kicks in all like it should. However once in a while, not all of the …

Outside unit running, but thermostat is off 
We noticed that our outside ac unit runs (the fan) even though the thermostat control is set to "off" inside the house. Is this a problem with the unit, …

My central air conditioner unit on the inside of my house is leaking profusely. I checked the pipe for condensation and it is running water very well. …

Central Air Compresior Not Working 
Over the last several days the power has went out and come on real quick. On Saturday they blinked really quick. That is a problem with AEP. Sat. Morning …

Top Fan Stopped 
Well, it started when I got home and e house was HOT 91 degrees. It was blowing air out the vents so I checked the key pad it was on cold. I then went …

Central AC Unit Intermittently Makes Noise And Stops Cooling 
I have a Goodman model # SSZ140181AC central AC unit which was installed a little more than a year ago. The unit worked fine up until about 2 months ago …

Thermostat problem?? 
I am working on a heat pump. The inside does not come on when I put the thermostat to auto, but will if I put it in the on position. Now the inside comes …

Central AC The Blower Motor Keeps On Shutting Off. 
I have had Ann Oil Company going to a house to fix a problem with the blower motor, it keeps on shutting down, they kept use a new excuse each time. I …

We recently had our Trane serviced, freon added, pressure checked, new fan motor installed on outside unit, furnace coils have been cleaned but, every …

Ruud 10 Seer Central Air Conditioner Unit 
My outside Ruud air conditioning unit is having problems. The outside fan continues to run even if the thermostat is set to off. The only way to stop the …

Central Ac Uni Blowing Warm Air 
At first my copper line was freezing, so I called someone out to fix it. The service man said it was low on Freon and charged it. It worked fine for …

Fan Works. Air Conditioner Compressor Will Not Start .  
Started central air conditioner system and it was blowing nice cool air, and then started blowing warm air. I Checked outside. Outside unit was making …

Central Ac Unit Constant Running 
This morning my husband and I woke up to a freezing house. Our thermostat (which we set at 72 degrees) showed 62 degrees and the air conditioning was …

Intermittent Compressor Start 
I have a York condenser (sorry no model number right now) that is about 6 years old. Lately, when I turn on the A/C, there's no issue, the compressor …

Air conditioning units kicks on, but not blowing through the vents. 
Turn A/c on thermostat with auto fan, A/C kicks on but there is no air blowing through vents, yet if Heat is turned on than there is air blowing through. …

Temperture Off and Unit/Furnace Running? 
I recently moved into this apartment and the heating appeared to be off and we weren’t receiving any heat through are heat ducts. they are the small square …

No Power To Air Conditioner 
The air conditioner was working only if we messed w/the thermostat for awhile then we changed the thermostat and now it doesn’t work at all even w/the …

Central Air Conditioner Not Staying Cool 
When I turn my central air conditioner unit on it comes on and cool air comes out, but after 30 to 45 min, it stops blowing cool air but blows room temperature …

Compressor Does Not Come On 
My air conditioner compressor does not turn on. Air handler goes on but not compressor. Could it be the contactor? What else? It is an American …

compressor runs for about 5 minutes then thermal shutdown 
I have a construction trailer type air conditioner that I transported to another location. It is the type that hangs outside on the wall with a large intake …

Central Air Conditioner Randomly Stops blowing cold air 
1.25 year old RUUD 4-ton Condensing unit (3-phase)with Air Handler (UANL-048JAZ); 410a refrigerant. When I come home and turn the thermostat down, …

Central Ac unit Running Constant With No Results 
1,000 square foot house. Goodman outdoor unit around 3 years old. Outdoor temp. around 90. Had no problems last summer. Set on 75, runs constantly …

blower turns on, but not the condenser 
When I turn the central air conditioner On I can hear the blower come on but it just blows hot air. Out side the condenser unit doesn't come on. …

Air Condition compressor will not start 
When the central air conditioning unit is suppose to start the furnace fan does kick on but outside at the condenser unit the fan is humming and I …

Cold air - hot air - cold air 
My 4-ton central ac unit is 8 years old. The Ac unit works normally for up to an hour then starts to blow warm to hot air. If I shut it down for …

Central Air conditioner Unit 
My air conditioner Unit is running. The fan is blowing outside in the unit. However I am not getting any air blowing inside the house.

Central Air conditioning Capacitor 
We have power going to an central air conditioner,I think its the capacitor, I bypassed the capacitor and the compressor came on. but I'm still not sure,so …

The air conditioner condenser 
The condenser unit is making a loud noise and the fan and the compressor is working. The inside unit is blowing. Also cold air is blowing inside the …

Central Ac Indoor Blower Motor Section 
My Central ac system is about 10 yrs old and has been maintained by professionals, since I purchased the home 3 yrs ago. However, I don't want to have …

Central Ac Not Cool Enough To Turn Off On Hot Days! 
We moved in our newly built home in Feb 2003. The house is 4100 sq ft and we had a builder installed Goodman AC unit. The central ac unit worked fine until …

Outside Unit Not Coming On 
I have a Carrier central air unit (model 38ed048300)manufactured in 1983. It has been serviced several times over the years. When I set the thermostat …

Central air conditioning unit is working, but no cool air 
My central air conditioning unit appears to be working but there is no cool air. The filters are clean, there is no build up of ice on the lines and …

Central Ac Unit Is Suspect, Not Working Properly But Told It Is. Not rated yet
I have all three problems that is described on the CAC problems page. I live in Arizona and the house is six years old. Two Carrier Units two zones. …

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