AC Compressor shutting off During hottest part of day

I have a Goodman GPG1348115M41CA package unit.

During the hottest part of the day, I noticed the compressor and compressor fan will shut off while the air blower continues to run. The compressor will cut on about every hour and run for five minutes then shut off again. If I turn the thermostat off and back on, it will come on and then shut off after about five minutes. At night once it cools off, the unit will maintain temp setpoint.

Upon investigation, I noticed the furnace ignitor wire coming from the control board was shorting against the case. I unplugged this wire and there is a heavy buzz coming from the ignitor coil on the control board. The ac compressor problem is still there. I replaced the capacitor and the issue is still there.

Any help would be greatly appreciated.

 

Welcome to the forums.

You need to determine what is happening.
When the condenser shuts down is the contactor still closed ?
It's fairly common to have a problem with the condenser fan failing which forces the compressor to shut down from thermal overload - high heat.

 

The contactor opens when this happens.

 

Ok..... so now you need to see if you are losing the 24v from inside the house or one of the safeties is opening inside the condenser. The best way to check is to connect a meter directly to the splice where the inside wiring connects to the condenser. The safeties will be between this point and the contactor. You need to confirm 24vAC.

 

I have 24v. Thank you for helping me.

 

You're saying you have the 24vAC on the Y and C wires at the condenser ?
If yes.... one of the safety switches.... high or low pressure is opening inside the condenser.

 

Thanks Pete. I will check this out. What do you think is going on with the ignitor coil on the control board? It was sending enough voltage through the wire to arc the wire through the insulation against the case. Since I unplugged the wire from the ignition coil, the ignition coils still has a constant buzzing.

 

If that is an intermittent ignition spark lit pilot or burner..... that line should be dead when no call for heat is made. It should not be buzzing when idle. I haven't seen that problem. It would point towards a board problem.