I have a central heating and air unit and the blower works but the air conditioning unit it's self dose not .

Question

If someone could help I would be ever so thankful.

I don't know what is going on and I would like for someone to give me some advice.
I don't have no one to call at this time of the night.Please Help!

The unit outside,We took the cover off of the wires and points.You can push the points in and hold them in and it will work right.But when you let go the points pop back out and the unit will cut off again.???

It is not the breaker.It works when you put a screw driver in where the points are.I think all of you for your answers.You are all kind.Thinks again for all the help.

Answer 1

YIM me, I will walk u thru on how to check for a low voltage problem.

Answer 2

First make sure that the thermostat is set lower than the actual room temperature. The selector switch must be on "cool". If the thermostat is programmable, be certain it has fresh batteries.


With the selector switch on cool and the fan switch on auto, move the thermostat well below room temperature. If the blower runs but the condenser(outdoor unit) does not, check the circuit breaker panel. If the breaker is on, examine the condenser. Some have a high pressure cut out. It is a button sticking out of the cabinet, usually near the refrigerant lines. Push it in as far as it will go to reset it.

If both units are running and no cooling is taking place, touch the larger of the two copper lines exiting the condenser. If it is warm, the system is out of freon or the compressor is down. If the line is frozen or iced over, the is an air flow problem inside, such as clogged filter or too many registers closed or an object covering the return duct. A low freon charge will also cause a freeze-up. Shut the system down and let it thaw out completely. If it freezes up again, call for service.

If the unit is in the basement and has a condensate pump, the control wire for the condenser might be wired through a safety switch on the pump. Check to see if the pump is plugged in and operable.

If the unit is in the attic, there could be a float switch in the air handler or in the safety pan that will shut the condenser off if the drain is clogged. Water around the unit is evidence of trouble. Call for service.

Answer 3

Power for the heater and fan is seperate from the A/C unit. If push in the contactor and the outside unit starts then the power is good. One of two things. Thermostat is making circuit the circuit because you said the fan is coming on. Proballythe Hi Pressure trip circuit located on the outside unit. The unit I have has a red trip switch on the bottom where the lo and hi pressure tubing is connected to. The only other shut off is lo pressure and you need special gauges to read the pressure. If the Unit was running and the power dropped out then the hi pressure will trip or if it was unusally hot outside then its possible the pressure climbed too much. Look for the reset.

Answer 4

The contacts that you pushed in, automactically close by 24 volts.your thermostat closes the contacts.............if its running on the inside and not on the outside,you would first check the breaker.which is what i think is wrong.
If the breaker is not tripped the only thing else for you to do is,if you been in your attic, you may have shut the switch off to the unit outside.lot of people mistake the a/c unit switch for a light switch.
One more thing i've seen --and this is new--...If your drian pan is full of water,it will automaticaly shut itself off to keep from flooding.
The 2 little wires which are probly RED and WHITE could be discontected on the outside. they go to that contactor you were pushing in.instead of u pushing it in.... the red and white wires will do that for you............i would like to know if this helped so add another message.

Answer 5

I assume you mean it does not blow cold. (I am not a professional by the way). There should be a second unit outside called a condensor unit that prodives the cooling feature. Hopefully the motor on it is not burned out. If the fan is not turning outside while the AC is running inside it most likely means the motor is shot and you need a repairman.

If the fan is turning outside, you need to go out and see if the pipes leading from it are frozen (yes they can do that in the middle of a texas summer) If the are, turn off your ac inside (you can pull a fuse outside, but it does not seem like you are up to that.

Now we have to get those pipes thawed. I have srayed water from the garden hose on mine before to help thaw. Let them sit 30 minutes after than and turn your AC back on.

If this fixes your problem you still should call a repairman tomorrow if you can to get him to look at it.

Good luck

Answer 6

Thermostat set right? If fan is working (blowing) but no cooling, then problem is probably with the unit outside. Shut power off to unit and then back on..see if that helps.

System may have leaked down enough that it won't start because of low charge.

You probably are looking at a pro coming over to inspect system.
Good luck.

PS...link below may help. Good site.

Answer 7

Check the breaker first if that don't do it it's probably either the relay ($45) or the hard start($10) these are the most common. The prices I included are estimated but should be close depends on model and are for parts only but either one is only a 15 min job.

Answer 8

hmmm, you need to check to see if you are getting 24 vac at the contactor for the compressor.

If it is not there then you might have one of the more expensive units with high and low pressure cut outs.

This is a comfort product, pay the $100 for a service call and get comfortable.

Answer 9

It could be a thousand things. Check the circuit breaker. If it is in the middle position it is tripped. Turn it off and then back on. If that doesn't work, call a contractor.

Answer 10

First check the circut breaker to the A/C unit. If it is on, then you are going to have to have someone come out and look at it. Too many thing can be wrong to diagnose online.

Answer 11

well, it could be your filters stopped up or your duct work has come loose. Also check the fuses on the ouyside wall next to the unit, if 1 blows then you,re only running on half power