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Re: Compressor will not start.
If the unit is low on freon it will short cycle but a compressor internal overload will cause it to. Lets hope its the freon. Has it been frezzing up lately. Low freon is the cause most of the time. Make sure your filters are clean and both fans are running. Hi head can cause this to. (fans not running) How old is this unit. Maybe the coils need to be cleaned. Sound like this unit may need a check up and a good cleaning.
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Have you checked the wiring going to the compressor to make sure it is not melted? Next, are you able to put your hand on the top of the compressor? Check to see if it is hot or cold. You might have a bad run capacitor so let the unit turn on, wait about 5 minutes, turn the unit off, and then tell me if the compressor is hot or cold to the touch. Next, are you comfortable with a meter?
A better solution than undersizing the fan (which would decrease your airflow and probably not satisfy the household as well) would be to change the deadband in your thermostat. (Disclaimer: best solution is always to have a properly sized unit!). Most programmable thermostats have a "deadband" that can be programmed in. This deadband is a certain number of degrees, in heating and/or cooling, where the thermostat will not call the system even though you have reached a threshold temperature. I.e. System is set to call for cooling at 76 degrees. there is a 3 degree deadband. When the Tstat reads 76 it will add the deadband (3) and not call for cooling until the room temperature is 79. This will prevent the compressor from cycling quite so much. Adjust your setpoint temperatures (i.e.76) with the deadband in mind and you can arrive at a range that is comfortable and reduces compressor cycling. Good Luck!
I t sounds as if the run capacitor is goinmg bad. You have a start and run capacitor in the unit the start side could be good however the run side is losing voltage and wont let the compressor run at its peak causing a thermal overload shutting down the unit for safety.
Would suggest the rplacement of the capacitor first then go from there
It sounds like your condenser fan motor may be locked up or the capacitor that helps give the condenser fan motor a kick to get it started may be defective. Try turning your system on and using a long screwdriver try to push the fan blade on the condenser fan motor to see if it will run normally if you give it the starting boost it needs.If it does run at full speed and doesn't over heat or start and then slow down then you probably only need to replace a simple 10-12$ capacitor. If it barely turns, makes an odd humming sound or overheats etc. then you will have to replace the condenser fan motor. This is assuming that the outdoor condenser has the 220v supplied and the 24v supplied to the compressor relay, that the compressor relay is engaged and suppling 220v to the condenser fan motor.
Check your wiring between the contactor and compressor for a short to ground, or check the compressor windings for short to ground.
With the Tstat off, the contactor should be open so the only way for the compressor to be trying to do anything is if the 110 volts from the unbroken side are traveling through the compressor to ground. Since 110v is not enough to run it, the overload is kicking it out, cooling off, and repeating the cycle. When you kick on the Tstat, the contactor is supplying voltage directly to ground without going through the resistence of the compressor windings and kicking the breaker.
Post back and let me know what you find.