On Sunday, June 3, 2018 at 6:06:08 PM UTC-4, Scott Frederick wrote:
I have an outside unit AC. Air handler and condenser unit all in one.
I keep on getting an intermittent failure of the compressor to kick on.
I've noticed it for off and on for several weeks.
The house will be warm. Tstat says cooling is on, but temp is 3-5 degrees warmer and just the fan running.
Sometimes it quits at night and then kicks on at mid-morning.
The fan kicks on, but no compressor or condenser fan operation.
Then it works fine for five days.
Then today it never kicked on from about 10am until around 4. It was in the mid to upper 80s outside. Working and cycling perfectly fine right now.
Where should I go from here?
Thanks

Are you sure you mean air handler and condenser all in one? Typically
the air handler and evaporator are in one unit inside and the compressor
and condenser are outside in another unit. Assuming the latter is what
you have, one easy thing to check is if the condenser fan outside is
working when it's acting up. The fan is typically connected to the
contacter, so if it's getting 24V and the contacter is working and the
fan is working it should be running. If the fan is bad it can run
intermittently and when it stops, the compressor will reach an over
pressure cutoff shortly and quit. Next would be to check if there
is power at the unit when it's acting up and if there is 24V AC at the contacter. If you're comfortable working with electricity and have a meter
you can check it. If not, probably time for a service call.