Inside unit turns on, outside doesn't

Could be a lot of reason why compressor is doing that .First make sure your outside unit is clean ,if not wash coil with water .If coil is clean check capicator and replaced if bad .if capicator is good then you might have a bad compressor or a leak in your system and compressor is shutting off on low pressure .
To figure this out you need to install your refrigerant guages to check

have you check the ON & OFF or the Sleep timer maybe set.

Thanks

change run capacirotor of outdoor fan motor.

Put in a 5 minute time delay. It is a two wire device in line with the contactor. Sounds like it is set to 75 turns of at 74 and repeats. The tstat should have a differential of 2 degrees as well.

there could be quite a few problems with it. either it has something to do with the high or low safety pressure switches. Or you have a low voltage issue-not getting enough low voltage power to the coil of the contactor. how long do you wait after you turn the unit on? there is a 5 to 10 minute delay in the control board to keep the compressor from short cycling. meaning to keep the compressor from turning off then on again right away. short cycling a compressor too much will ruin it. There also could be an issue with the delay board it self. Or its a heat pump it could be an issue with the defrost board or the defrost sensor. I have even seen it to have a short in the wires of the coil of the contactor. But when that happens it will burn out the transformer or the low voltage fuse of the transformer or on the control board.

have you got it figured out already? If not can you give me more info on what it does? Or if it ever comes on after you wait at least ten minutes. Can you hear the hum the coil of the contactor makes when it is calling for the cooling. you might even have a problem with the contacts of the contactor not getting the proper power thru it to turn or keep the unit on.


Like I said there could be quite a few different possible issues with it to not stay on.

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My central AC unit decided to stop on the hottest day of the year. It would start and run normally for a few minutes and then the blower would shut off. After checking the breakers, thermostat and overflow shut off (did not have one) I saw something about a blower motor capacitor. This was easy to get to and replace and my last hope before waiting for someone to come fix it. The capacitor cost $4.04 with tax and had my AC working again. Needless to say I was beyond happy. I hope this can help others with a similar problem.

The outside and inside coils may need cleaning. Clogged coils cause excess pressures and heat of the freon that can cause safety switches to shut er down. Eveen a faulty power relay in the outside unit.Otherwise you may need a serviceman to locate the cause.

You will need a technician to check the system pressures with a gauge. Souns like the compressor is fighting high pressure in the coil that is outside.. Try this.Right after the compressor chugs to a stop, un plug unit and run cool garden hose water over the outsife coil for a few minutes, then see if the compressor will start again any sooner yhan before. If so. High pressure is the problem. But you still need a tech to adjust the refrigerant level. Make sure air is blowing out from the coils. You may want to clean the coils before our little test Hose it out with pressure yo remove any buildup on the coil and fins. Spray with 409 if you wish, it would help remove the dirt. Let it drip dry for half an hour and see if the compressor still shuts down. Make sure any water coming from the a/c itself is draining so the fan doesn't throw it around. Good luck Ned

The Mitsubishi units have to be reset by turning off the indoor units by switching the remote or thermostat to off. Then turn off the breaker to the outside unit(s). After 30 seconds,turn on the breaker and then you can turn on the remote for cool. If no lights come on on the inside units, most likely you have blown a fuse soldered on the main PC board. At this point, call your technician. A goos tech will be able to wire in an in-line fuse holder so if it should happen again, you can easily replace the fuse. If you do see a light or two come on at the indoor unit but the outdoor unit does not start after 3 or 4 minutes, sounds like you will need to call a technician. Most likely you have a blown fuse on the main PC board of the outside unit. It is not an easy one to replace. Good Luck!