Hi All, Moved into a new house in May and have no experience with GeoThermal. I have 3 units. 2 of them I've had to bleed air from this summer (by the suggestion of an AC contractor) to get the unit to begin pumping again (there must be a low pressure shutoff). 1 unit has been having issues for the past 2 weeks and I continually have to bleed air every few days. I'm also getting dirt particles in the water that is coming out. The units are hooked up to house water so doing this isn't difficult. I just open the bleed valve, then another valve that is connected to a faucet which also has a valve to the house water. Is this a MAJOR leak in my loop? If so how can I fix it? I'm not sure where the loop is, since these two units are in my attic and the hoses dissapear into the wall. Hopefully they didn't run it through the slab of the house.