During low voltage period window AC compressor shudders and kicks off, but fan runs, when voltage returns normal compressor runs.

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 !!!

once the compressor kicks on the fan for ac should come on is ac charged?

Check your breakers and make sure you are getting the required voltage. Sounds like you are not getting the correct voltage to the system.

Check incoming voltage circuit and wiring for proper gauge wire etc, and have compressor start capacitor tested, or replaced. I'm curious as to why circuit breaker didn't trip in panel when compressor causing so much current draw, that's reason for checking wiring etc to AC circuit.

HMMM this sounds like a couple things possible Low voltage due to lose wiring some place. or low voltage due to the power company . something is pulling more amps than it should.

Sounds like a bad control board

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I would check the freon level in the AC system. The computer looks at the voltage from the pressure switch in order to activate the compressor clutch. If the voltage is not in the right range the computer will not turn on the compressor and in turn will not turn on the cooling fan. It is set up this way in order to prevent damage to the AC compressor. I would almost bet that the system is low and may have a small leak. Your local mechanic can check it for you and correct the charge level as needed.

faulty compressor

you check the fan motor and the compressor winding and terminal you have a short

If the compressor never kicks in, I would check the start capacitor, thermostat and the compressor windings. Most times the start capacitor is defective. Some window air conditioners the fan will run while the compressor stop through the thermostat switch. If the thermostat switch is bad every thing runs except the compressor. Let me know, Thanks, Sea Breeze