Originally Posted by CAMERON12
I'm getting an error code on my american standard freedom 90 of 3-flashes indicating pressure switch problem. I have blown through the hoses and get it to work for a few days and then the furnace goes out again. It's happened several times now. Are there any recommendations or solutions out there?
ok first of all a pressure switch code doesnt refer to water in the condensate lines ,it refers to possible water, or another restriction in the exhaust pipes. soooo 1 be sure there are no obvious restrictions on the exterior venting. 2 check and make sure you have at least quarter inch per foot sloping on your vent pipes,and they are not holding water anywhere.chop chop good luck