I let it try several cycles before turning the switch (the one we added) off. Circuit breaker has never tripped. The black wire to Fan comes from terminal 4 on the relay. The black wire to Pump comes from terminal 8 on the relay. I guess the relay refuses to latch leaving them cycling?
That's the other component next to "Comp C", it's a relay. Took a headlamp to read it, sorry. Labeled CR on the wiring diagram. Makes sense, compressor relay. Along with the fan and pump. Your 240 v. guess looks better as we go along.
Ooooh, I'm a dummy. The terminals aren't labeled on the relay, but the wiring diagram shows which is which. 1 on the relay goes to H1, 0 goes to pressure switch and indicator light. The other side of the pressure switch goes to H2. Still not sure how it works, but I'm getting closer.
Got lost on your drawing and was just attempting to figure out your open email. Greatly appreciate the offer, I'll figure it out.