Well, I had this alarm. I called for explaination.
The official reason that all those symptons will flag a High Head alarm, "..we're computer programers...picked the five conditions and chose what we thought would be the most common....."......"essentially the compressor is running outside it's design envelope".
Hope that helps. Hahaha
I'm thinking the 650 psi cut out switch flags the alarm!!!No? (transducer)I don't know. If it does it again and that massive filter dryer that i put in isn't clogged. I'm changing the HP switch!!! I've seen a few go bad on RTU's!