I have air coming out of the faucets in my house. it worked great until I had furnace trouble I have a GEO furnace (heat pump). before the furnace issue I had good water pressure throught the house and enough at the heat pump. The dole valve was shot, and after it was replaced, and the furnace working, I had low pressure with air when heat pump was working. when the heat pump shut off, i had great pressure in the house. Any ideas?