Fan will come on but compressor wont kick in on wall unit ac

no info generic answer check and test thermostat and wiring circuit fan & heat should not be coming on when in a/c mode

All the motors including the compressor on the outside unit have start/run capacitors. These can fail and when they do, the motors wont start

Normal ACs (non inverter) work in the following way

• The AC compressor runs continuously till set temperature is reached in the room
• The compressor then switches off, but the blower fan in the wall mounter unit keeps running. Durint this time the AC fan blows air out at Room temperature (which feels warmer)
• When temperature of room rises then compressor starts running again. During theis period the air coming out from the inner uny is cooled by the condenser coils
• And the process is repeated.... as long as you keep AC running

Ac works this way throught the operation period.
Now if you feel that your AC keeps switching off and on very frequently check the following

• Your AC may be over powered for room *for example a 1.5 ton AC installed in a scenario where 1 ton is enough)
• If there is voltage fluctuation in your area then the compressor may keep shutting don on large voltage swings
  • Solution: Get a Stabilizer
• You have set the temperature setting too high. Max temp suggested for ACs is 25 degree Celsius, any higher will mean the compressor shuts down often. Remember every compressor shutdown and startup draws a high starting current
  • Set AC temperatures between 22 and 24 degrees Celsius
• The thermostat/ Temperature sensor is faulty
  • Get unit inspected by Authorized technician
• There is dust buildup on the outer unit / compressor unit. The dust buildup may cause overheating by preventing efficient heat exchange, This may lead to overheating of compressor and it shuts down to, prevent damage to itself
  • Get unit serviced by Authorized technician
• The fan motor of the outer unit is not working properly
  • Get unit inspected by Authorized technician

Remember to get the AC serviced at least thrice a year to ensure smooth operation
Cool Thoughts... Cool Life !!!

leave the power on, pull the screen off the wall, leaving just the sub base, and then see if the outdoor unit shuts off. FIRST, turn the system to off and the fan to auto. see what happens then.

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

I would check the fuses first. After you confirm the fuses are good, I’d unplug the compressor and turn on the ac inside the car. With a test light or voltmeter, one of the wires should have positive voltage. Assuming the climate control unit inside the car is working correctly. If one has power when u switch it on inside and then when U turn it off the wire that had power doesn’t anymore then check to make sure the other wire is grounded. If it is the compressor is bad. Now if you don’t have enough Freon in the car it won’t kick on. The low pressure switch will prevent it from kicking on. Does your fans kick on when you turn on the ac inside? You can take and apply power to the compressor with a jumper wire from the positive terminal
On the battery and hook it to the positive wire on the compressor. If the compressor kicks on it’s good and it’s not the compressor.

mcdevito75 Here, Try this, turn the a/c off completely and un-plug from the wall outlet for 5 minutes. Plug back in the wall and just put the a/c fan on for 5 minutes, then turn the control that says cool slowly to it's coolest positon and see if the compressor will kick in, if it doesn't you may need a charge of freon, if the compressor does kick in slowly back off the cool control to where the compressor just turns off. Contact any a/c repair shop in your area they come to the house.

You are low on freon. There is a pressure switch that will not allow the compressor to kick on in order to protect the compressor. The freezing up of the unit is an indication of a leak or air flow blockage.

Take a look at your start capacitor. This the capacitor that kicks the compressor over when it tries to start. If the capacitor is bad, it cannot kick the compressor back over after the first cycle because the head pressure has not evened out yet. It is located in the upper unit on the side panel in a small box. Be careful, highly charged capacitors can zap you if you are not careful. Disconnect power and touch across the terminals with a meter or a screwdriver to discharge the capacitor.

Hope this helps,

Jeff

The first thing to check is your breaker box. There should be one double breaker for the air handler unit, that's the inside unit, and one double breaker for the compressor, that's the outside unit. Check both breakers. If you're not sure if they've be thrown, click them toward the outside of the breaker box (off position) and then click them toward the inside of the breaker box (on position). If the breakers are on and you still are not getting any A/C take a look at your compressor, (outside unit). If the fan is running at least you're getting power. However, your compressor down inside the unit may not be getting power or it may need to be replaced. The compressor has a start-up cap. If this cap goes bad or the wires from this cap fry or corrode away, this will also keep the compressor from starting but the fan will still run. If the fan is not running it could be caused by a faulty relay inside the compressor cabinet. This relay is supposed to open and close based on a low voltage signal from the thermostat. I believe it's roughly 24 volts. This relay switches on and off the 240 volts for the compressor and the compressor fan. Often this relay goes bad or the wires leading up to it fry. If you?re going to work on the unit yourself make sure all power is shut off. There should be a shutoff switch on the outside wall near the compressor. I?d also shut the breakers off.

Hi Phillip,

Check your thermostat wires to see if you have any of them which are bare and touching. If any are touching separate them and tape em up and try unit again. You have a direst short in your cooling portion of the unit.