American standard freedom 90 error code

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?

Marty S.

Condensate lines running slow can cause intermittent pressure switch errors.

DELTA.T4935

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

hvactech126

first of all it could be a slow condensate line that would cause this as : if the condensate backs up in to the inducer it will cause the pressure switch to trip.

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