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Central air unit problem

I have a central air unit that is not working after having an over 24 hour power outage, now it is the only thing not working now that the power is back on...there is no breaker in the house, i have already checked the thermostat and it is working fine, and the breaker box by the unit i already turned that off and back on....please help...thanks in advance michael

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Check inside that breaker box for fuses.

Posted on Sep 06, 2008

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10 year old Goodman central AC won't come on after mini power outage. Breakers and wall thermostat OK.


Check the start capacitor for proper value and replace if necessary.
Ditto for thermostat. There are also some fuses in the air handler that might need replacement.

You may have had a power surge that had a bad effect on electronics of unit. Make sure that unit is receiving power for one thing. U might try to reset the electronics by completely shutting off all the breakers to compressor and air handler and waiting a few minutes and then reconnecting.

Sep 02, 2015 | Goodman Air Conditioners

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My Carrier Central Air unit is not working and shows Code: 24 VAC power


Will the indoor unit run with the Thermostat fan switch set on auto?
I need to confirm that the indoor unit runs first.

Jun 03, 2014 | Carrier 38CKC036 Air Conditioner

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It has been 12 hours on the Frigidaire A/C since the power outage. The unit still has not come on.


Hi, check to see if there is power to the unit. Is there any lights that are on the unit. If power is good
Check for a reset button or switch. Or just turn the unit off and on may work. Good luck.

Jul 30, 2011 | Frigidaire FAZ12HS2A Air Conditioner

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York central unit condenser does not run. Red Led light on circuit board keeps blinking.


Hello,

There seem to be a problem with the unit that is why it is acting that way. If the air conditioner is not working but has the power light blinking. Yet the fan is not running, then you need to troubleshoot the unit. There are some tips for troubleshooting the air conditioner to be able to detect the problem and know the best appropriate procedure to solving the problem.

A few basic principles for air conditioner troubleshooting. For both central home air conditioner or window air conditioner, the first thing to check is whether the unit is getting proper power. If the unit uses 220 volt power be sure that the proper voltage is getting to the unit. Same for 110 volt units. A voltage meter can be used to assure that the voltage is correct.

For window air conditioning units the voltage can also be checked before and after the thermostat. If voltage is being supplied to the thermostat but not from it then the thermostat probably needs replaced. This is a fairly common problem. Another place to check is the fan motor voltage. The fan on window air conditioners runs both the indoor blower and the condenser fan. If that motor fails than the compressor may run for a short time, but will overheat and shut off. Continued operation like this will result in compressor failure. This motor can be economically replaced for larger window air conditioners, but for smaller ones the cost of replacement will be more than a new unit.

Central air conditioners for the home are more complex and there are more things that can go wrong. As with the window air conditioner the thermostat can also be a problem. The central air conditioner thermostat will only have 24 volts going to it. So don't look for high voltage there. Some units the voltage will be coming from the outdoor unit and others the voltage will be supplied by the indoor air handler or furnace. Most home central air conditioning will be supplied by the indoor air handler or the furnace. If the air conditioner is for cooling only the unit will usually have only two wires going to the condenser unit. Make sure that you have 24 volts across those wires.

The next thing to check will be the indoor blower. If your thermostat is calling for cooling then the indoor blower should be running. If there is no air moving across the indoor cooling coil then you will soon have a big block of ice formed on the coil. This can happen for a few reasons. The indoor blower is not working, the air flow is restricted and not allowing air to move across the coil. A clogged air filter would also do this. Or the outdoor condenser unit has lost the charge of refrigerant.

Finally and worst of all is when you have a complete compressor failure. Often when this happens the compressor will "lock up" or not be able to turn when power is supplied to it. Overheating or lack of lubrication are usually the main causes of compressor failure. Overheating can be caused by the outdoor coil around the compressor getting clogged with dirt, leaves, or grass. Loss of the refrigerant charge will also cause the compressor to overheat. It is the cool return gas coming back to the compressor that helps to keep it from overheating.

As you can see there are many things that can go wrong with an air conditioner and I have not come close to exhausting the possibilities here. I have just touched on the most common problems in a very basic way.

There are some basic trouble shooting things that can be done very easily. Most problems are above out of the range of comfort for many homeowners and professional help should be consulted before any attempt is made at repairs.

Good luck.

Jul 14, 2011 | Air Conditioners

1 Answer

Air conditioner stopped working, nothing works, breaker is on, power to air conditioner is good, It was working just fine and then every thing stopped. All the other electrical things are working just...


A few basic principles for air conditioner troubleshooting. For both central home air conditioner or window air conditioner, the first thing to check is whether the unit is getting proper power. If the unit uses 220 volt power be sure that the proper voltage is getting to the unit. Same for 110 volt units. A voltage meter can be used to assure that the voltage is correct.

For window air conditioning units the voltage can also be checked before and after the thermostat. If voltage is being supplied to the thermostat but not from it then the thermostat probably needs replaced. This is a fairly common problem. Another place to check is the fan motor voltage. The fan on window air conditioners runs both the indoor blower and the condenser fan. If that motor fails than the compressor may run for a short time, but will overheat and shut off. Continued operation like this will result in compressor failure. This motor can be economically replaced for larger window air conditioners, but for smaller ones the cost of replacement will be more than a new unit.

Central air conditioners for the home are more complex and there are more things that can go wrong. As with the window air conditioner the thermostat can also be a problem. The central air conditioner thermostat will only have 24 volts going to it. So don't look for high voltage there. Some units the voltage will be coming from the outdoor unit and others the voltage will be supplied by the indoor air handler or furnace. Most home central air conditioning will be supplied by the indoor air handler or the furnace. If the air conditioner is for cooling only the unit will usually have only two wires going to the condenser unit. Make sure that you have 24 volts across those wires.

The next thing to check will be the indoor blower. If your thermostat is calling for cooling then the indoor blower should be running. If there is no air moving across the indoor cooling coil then you will soon have a big block of ice formed on the coil. This can happen for a few reasons. The indoor blower is not working, the air flow is restricted and not allowing air to move across the coil. A clogged air filter would also do this. Or the outdoor condenser unit has lost the charge of refrigerant.

Finally and worst of all is when you have a complete compressor failure. Often when this happens the compressor will "lock up" or not be able to turn when power is supplied to it. Overheating or lack of lubrication are usually the main causes of compressor failure. Overheating can be caused by the outdoor coil around the compressor getting clogged with dirt, leaves, or grass. Loss of the refrigerant charge will also cause the compressor to overheat. It is the cool return gas coming back to the compressor that helps to keep it from overheating.

As you can see there are many things that can go wrong with an air conditioner and I have not come close to exhausting the possibilities here. I have just touched on the most common problems in a very basic way.
There are some basic trouble shooting things that can be done very easily. Most problems are above out of the range of comfort for many homeowners and professional help should be consulted before any attempt is made at repairs. Remember also, that the release of refrigerant gases into the atmosphere is a federal offense in the
US. Proper care must always be taken to minimize the release of any gases. A license is also required to handle refrigerants. Make sure that the professional you call has the proper certifications to handle refrigerants properly.


http://www.fixya.com/support/r3636709-size_air_conditioner_need

http://www.fixya.com/support/r3623253-window_air_conditioners_clean_every_year

http://www.fixya.com/support/r3633369-portable_air_conditioning_great_portable

http://www.fixya.com/support/r3623166-heating_air_conditioning_scams

http://www.fixya.com/support/r3597468-you_can_add_air_conditioning_to_your_hot

http://www.fixya.com/support/r3583697-how_to_keep_house_cool_without_using_air

May 26, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

My central air froze after we had a power outage. Now the outside conpressor is shutting down coming on.


sounds like a coincidence. the unit will freeze if low on freon and a low pressure switch in the unit out side will make in cycle off and on

Aug 02, 2009 | Air Conditioners

1 Answer

Central air cond. was working fine 5 hours ago it went off and wont come back on. the thermastatis not lit up. it does nothing.when you try to turn air on, nothing happens at all


First ,you should verify thermostat has good batteries.secondly ,you should check to make sure the circuit breaker isn't tripped. If both of these give no results and you feel comfortable digging around the unit yourself, you will have to access the sevice panel on the outside unit to verify voltage from transformer. You should check the secondary side of transformer for 24 volt ac, as this is what feeds power to your thermostat . Hope this helps

Jul 30, 2009 | Air Conditioners

1 Answer

Vulcan CX Central ducted heating. RE: Following a power outage the control panel does not respond, I have checked the pilot light and it is still on. I need to know how to reset the time and get it to...


The control panel gets its power from the central heating unit's power point. Try turning the power off outside at the powerpoint next to the ducted heating unit and try turning it on again after a few seconds, see if it resets

Jul 06, 2008 | Air Conditioners

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