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 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.
You need to allow the fridge to fully defrost now. (Even if it is a ''frost free'' unit that doesn't require ''defrosting''). If the fridge was closed during most of the power outage, it partially ''melted'' and then _froze_ solid when the power came back on. Let it totally defrost, unplugged _with doors open_ for 24 hours and it will be ok. (I realize that is a problem with food, but it must be done).
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.
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.
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.
First check there is power to the unit and the trips and fuses are all OK
If so then unplug the unit for around 24 hours, then switch on and listen, you should hear the compressor start up ( a low buzzing sound), however if then you hear a click and it goes quiet the compressor is probably faulty. This happens often after a power outage which can produce a voltage surge.
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