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its one of three fults,,,
it could be the thermostat playing up,,,fit a new one
it could be it needs a re-gas,,so re-gas it
or the compresor could be playing up,,
if the compresor is at fult it needs a new compresor and a re-gas to fix the problem,,,
the compresor is a pricy part to replace,,
how old is it??? would it be cheaper to just buy a new unit insted of patching up the old one? as its only likely to brake down again at a later date!!!
so it could be cheaper to buy new in the long run
If the compresor, overheats, then compresor it's not good, make sure that there is a safety cycle on. Explain: there should a click when compresor starts if you hear a click again within 30 secs. is a confirmation that the compresor has weak coils, and needs to be replace. If this is not the case, make sure you are not using an extention cord to run this unit, maybe wire are overheating.
most likley its the thermostat thats given up the gost but it could be the compresor as well, the therostat is the cheepest to replace so try that first,, if the compresor has failed thats going to be pricy,,, as it will need a regas as well, in witch case dump it and buy a new one,,,
First make sure there's power to the unit outside , if yes set the theermostat on cold ,auto and to the lowest degrees ,then look the outside unit contactor, it should be pulled in (sometimes it takes to 5 minutes beacause a time delay) , if not the problem is in the thermostat , but if yes and there's power on the other side of the contactor ,either the compresor running capacitor is bad or the compresor itself went bad .Try replacing the capacitor first (the cheaper option) and adding a startting booster in paralel with the capacitor ,if still the compresor doesn't start you nedd to replaced it.All this counting that the fan in the outside unit works ,if doesn't replaced it.
Set the thermostat to the coldest and check if there's power to the compresor relay , if yes the relay or the compresor are bad (in this case replace the relay which is the cheaper first step ,but if the compresor still won't start probably is burned out) If there isn't power to the compresor put a jumper wire to the thermostat if the compresor runs replace the thermostat.
If the compresor is very hot and won't start,the clicking you heard is the overload at the compresor that goes on & off beacause the relay ,that makes the compresor start is bad or the compresor is bad ,if you know how check the compresors coil if not try replacing the relay with a same replacement(no more than $20 or $30) if still won't start the compresor needs to be replaced.
check your compresor motor if not working, first step 1, check the over load ic at side of your motor compresor have a plastic cover. 2, check your thermostat control inside the said unit, 3, check the fuse supply the motor. mostly no fuse, clean it and strat if no start, try to replace the ic overload, god bless email@example.com