I have been working on 2 RUUD UGRA-06EMAES furnaces. I am getting a pressure switch lockout code. When I take off the hose that is connected from the pressure switch to the draft inducer port, there is some hard white and orange deposits in the draft inducer port. I clean out the port and the furnace works for 3 days to a week and then the customer calls back and the inducer port is plugged again. This is very frustrating. Has anyone else experienced this and what can I do to fix it?