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First make sure power is off...there is three leads that supply power to compressor...they should be Yellow Black and Red....make a diagram where these leads connect on your unit and then disconnect them...You will need a multi meter to check ohms of resistance...Yellow is usually the common lead...attach one meter lead to it...now touch other meter lead to black lead...should read somewhere between 1 to 4 ohms...now touch the meter lead to the red wire...should read somewhere between 3 to 7 ohms...next read from yellow lead to side of compressor...if you get any reading then compressor is grounded and needs to be replaced...if you get no reading there, reconnect lead and see if compressor will run...if it will not then if could be possible capacitor is bad...on some units they have start assist capacitors this could be bad also..replace these and see if compressor runs...if it will not run it will need to be replaced..if it does run use an amp meter and check load amps of compressor...
Wiki User
∙ 16y ago
Wiki User
∙ 15y agoConnect your manifold gauges and observe the compressor amperage and operating pressures given the current indoor and outdoor conditions and check suction superheat and if the conditions are at design, also check liquid subcooling. If the values of all of these are in line your refrigerant charge is correct.
Wiki User
∙ 14y agoAfter you have checked all of the obvious things, thermostat, outdoor fuses and the circuit breaker you`ll have to call somebody.
Anonymous
Compressor motor
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What should you do if your residential AC outside unit fan will come on and the compressor will only come on for a second and then shut off and the unit is not throwing a breaker?
Call an HVAC repairman. You're probably low on freon and a protection system is keeping the compressor from burning up. Sounds like to me it is a protection device. Probably an internal overload on the compressor. Have you checked the outside coils they may be blocked with dirt? This would cause the compressor to go out on overload.
What could cause the outside fan not to work on a central air conditioner?
There are three main parts to an air conditioning unit. You could have a bad capacitor. AC units have fairly large capacitors that are required for the motor to start. That is the most likely point of failure. Otherwise, your compressor could have gone bad. Lastly, your fan motor could have gone bad.
Which color wire is the hot to the AC compressor on a '99 Chevy Suburban?
The Dark Green Wire should be the hot to the air compressor clutch and Black should be ground.
What cause home ac compressor to seize mine was installed 16months ago Was told electrical storms?
Lightning could, but usually its over charged though there are other possibilities. Lightning should have left some marks. It is not impossible 16 month old compressor should fall under your home warranty one way, and under the manufacturer's the other.
Why is my fan on my ac unit not coming on when i turn the heat on?
I assume that you have a ford topaz/tempo. Blower fan not working. First check to see if there is power to the blower. Its behind the glove box. Just unplug the power input, and check for power, sometimes even with power, the blower just might have a bad ground,or be finished, be prepared to remove it, not a big job. Also check the switch at the on/off control.
What causes compressor to lock out ina home ac?
what causes compressor lockout in voager rooftop unit.
Why is your outside ac unit blowing cool air?
the compressor is not running. Check your breakers.
Can you rebuild a compressor for home AC unit?
No the compressors in residential condensing units are called hermetic compressors and have to be rebuilt by cutting open the compressor shell, then rebuild the compressor and then weld the shell shut. Buy a new compressor or condensing unit.
Does the compressor come on if you have the fan only running on your home ac unit?
Yes your compressor comes when you set your thermostat to "Fan" setting and you have it on cool setting.
Why does a home ac unit turn off hard?
If your AC unit is a later model one and uses a scroll type compressor, the noise you are referring to is a the discharge check valve closing at shutdown. The newer model scrolls have this valve to prevent backspin as the pressures equalize.
Why does your ac unit not cycle off and on?
Bad compressor
Can you use 3 split ac unit on one compressor unit?
Up to 2 forced air units to one compressor unit.
Do you have to discharge the ac when replacing AC clutch?
no, unless u have to remove the compressor unit. The clutch can be replaced with out removing the compressor if you have room to do it.
Why does the AC unit not come on in 1998 Mercury Tracer but the compressor will run if jumped?
Low pressure relay is bad! Check freon pressure, if it falls too low, the compressor will not run (installed for safet of compressor)
Ford focus have a ticking sound from the AC and only heard when the AC is on?
Check the ac compressor and clutch to see where the noise is coming from. Also check the compressor drive belt for wear.
What could be wrong with your home AC central air if the thermostat clicks on and fan but AC unit won't start and new fuses and switching the breaker on and off didn't help?
It could be off on a low pressure switch. You need to check if you have 24 volts to the outdoor unit at the contactor coil. If the contactor is not working the outdoor unit will get no high voltage to the compressor or fan. It could also be that the capacitor for the fan and compressor is blown.
The ac compressor does not come on?
There can be a couple of reasons due to which the AC compressor of your car might seize to work. First of all check the wires leading to compressor and the fuse switch. Next you have to check if the compressor holds enough gas for AC to work. Also, check for a leakage in steel pipes that circulate the air.
