Homeowner attempting some self-diagnosis on an aging Amanna AC unit. The unit will start running, but will sometimes kick back off after a short time. My not-so-trusty multi-meter shows the 24v to the contactor drop out when it stops, and I can hear a click less than 30 seconds later when a switch re-sets. I believe it's the low-pressure cutoff. Watching the voltage across the cutoff switches while it's running, it would occasionally drop down to 14-16 volts briefly then recover.
After several rounds of this, it finally kicked on and ran for a much longer time, probably 10-15 minutes without cutting off. Do I have a bad low-pressure switch or am I looking at needing a professional service/replacement?
In case it's relevant, I just replaced the run capacitor. It was shot and the fan wasn't running.