Geothermal not keeping up.....UPDATE: Not fixed, but new info. UPDATE: It seems I had it all backwards. STAGE 1 is where the intermittent problem is. If I restart the system, the Y1 call lights comes on, and only the blower fan comes on.....the A compressor never starts. Then when Y2 lights, the fan goes to 100% and the B compressor starts. It's running in stage 2, with only the second compressor. I can manually press the A-relay in and get compressor A to start, but as soon as I let go, it shuts off. If run leads from the B-relay and jump the A-relay, and it will close. So, it's not the relay--it's the power to the relay, or lack thereof. One of the other things that I have found, if I do a cold restart with the stage 2 (B-relay) disconnected, the A-relay will sometimes close and start the problematic stage 1. Then if I wait until the Y2 call light comes on and reconnect the B-relay, all works normally. That's how I have gotten through the 108F days here in St. Louis. Everything is working normally now, so I'm just trying to get as much info and ideas together so I can duplicate (if not explain) this to the tech next time. Thanks again for all the support. ---------------------------------------------------- I've been having a few problems with my system the last few days. It's not keeping up with the 90F+ afternoons. The system runs nonstop from about noon until after midnight and it will be 75-78F when the thermostat is set at 70F. -St. Louis, MO -2500 sqft two story very well insulated & window tint -ClimateMaster with a two vertical closed loops. -The loop pressure is 50psi -The water temp going out to the loop is 80F -Coming back in from the loop is 74-75F -Cold air return temp is high 70s (ambient) -Air leaving the unit it's 66-67F -Clean filters, clean coil, good ducting. -Worked great last summer, and over the winter. -Both pumps are running, as is the desuperheater pump Now here's what made me think something is wrong.......the water in my buffer tank is in the 70s. Normally on hot days when this thing runs non-stop, the water in the buffer tank is 100-110F+. So what's up with this thing? Is the loop not circulating?